- Research article
- Open Access
A review of autobiographical memory studies on patients with schizophrenia spectrum disorders
BMC Psychiatry volume 19, Article number: 361 (2019)
Patients suffering from schizophrenia spectrum disorders demonstrate various cognitive deficiencies, the most pertinent one being impairment in autobiographical memory. This paper reviews quantitative research investigating deficits in the content, and characteristics, of autobiographical memories in individuals with schizophrenia. It also examines if the method used to activate autobiographical memories influenced the results and which theoretical accounts were proposed to explain the defective recall of autobiographical memories in patients with schizophrenia.
PsycINFO, Web of Science, and PubMed databases were searched for articles published between January 1998 and December 2018. Fifty-seven studies met the inclusion criteria. All studies implemented the generative retrieval strategy by inducing memories through cue words or pictures, the life-stage method, or open-ended retrieval method. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) Statement guidelines were followed for this review.
Most studies reported that patients with schizophrenia retrieve less specific autobiographical memories when compared to a healthy control group, while only three studies indicated that both groups performed similarly on memory specificity. Patients with schizophrenia also exhibited earlier reminiscence bumps than those for healthy controls. The relationship between comorbid depression and autobiographical memory specificity appeared to be independent because patients’ memory specificity improved through intervention, but their level of depression remained unchanged. The U-shaped retrieval pattern for memory specificity was not consistent. Both the connection between the history of attempted suicide and autobiographical memory specificity, and the relationship between psychotic symptoms and autobiographical memory specificity, remain inconclusive. Patients’ memory specificity and coherence improved through cognitive training.
The overgeneral recall of autobiographical memory by patients with schizophrenia could be attributed to working memory, the disturbing concept of self, and the cuing method implemented. The earlier reminiscence bump for patients with schizophrenia may be explained by the premature closure of the identity formation process due to the emergence of psychotic symptoms during early adulthood. Protocol developed for this review was registered in PROSPERO (registration no: CRD42017062643).
Schizophrenia spectrum disorders (hereinafter referred to as schizophrenia) are chronic mental disorders with a lifetime prevalence rate of about 1% of the population worldwide [1, 2]. The symptoms of these disorders typically emerge between the mid-teens to mid-30s, with the disease onset in males being slightly earlier than in females [1, 3]. Patients with schizophrenia demonstrate significant cognitive deficiency, which is considered to be the primary reason for impairments in social functioning [4, 5]. Cognitive deficits in the domains of autobiographical memory (AM), working memory, processing speed, and cognitive control are prevalent [6,7,8,9]. Impairments in social cognition and theory of mind (ToM) are also widely reported [10, 11]. The aim of this paper is to review research examining one core cognitive deficit in patients with schizophrenia: deficits in AM. Specifically, we aimed to review the research that investigated: (a) deficits in AM content and structure; (b) how insight, depression, and history of attempted suicide affected the memory of patients with schizophrenia; and (c) theoretical accounts that were attributed to the defective recall of AMs among these patients. Studies in this area implement different cuing techniques; thus, a secondary aim was to consider whether AM methodology influenced results.
We are interested in the AMs of patients with schizophrenia because deficits in this type of cognition significantly impair an individual’s self-identity, ability to learn from experiences, and social communication. The most recent systematic review on AM in patients with schizophrenia summarised findings concerning the components of AM among patients with schizophrenia, and other mental disorders, in the case where AM has been studied . This comprehensive review included 78 full-text articles selected from PubMed and PsycINFO and published since the inception of those databases through July 2015. The results illustrated that AM components such as form, content, awareness at retrieval, and lifespan distribution were impaired in patients with schizophrenia compared to normal controls. The reviewers concluded that defective AM is a major cognitive impairment in people suffering from schizophrenia .
The current systematic review focuses on similar research questions, but also considers three additional and important aspects. First, it has re-examined various theoretical frameworks proposed to explain defective AMs in patients with schizophrenia, including the Self-memory System . Second, as 14 new articles on the same topic have appeared in the literature since the publication of the last review, we included them in the current review to give an up-to-date overview of these findings. We also included an additional 15 articles published before the last review that were not previously considered by the reviewers. Third, since the previous review examined the intervention programmes used to improve patients’ AMs and found contradictory evidence, we aimed to offer an in-depth analysis of why some interventions worked and why some failed to produce any positive outcomes.
In this systematic review, features of AM in patients with schizophrenia were considered through the lens of the Self Memory System (SMS)  and the CaR-FA-X model . According to SMS [14, 16], the retrieval of AM is guided by complex interactions among an individual’s working self, conceptual self, and the autobiographical knowledge base. The term “working self” in SMS refers to “a .complex set of active goals and associated self-images” . The conceptual self, however, contains the socially constructed schema and categories that define the self, other people, and an individual’s typical interaction with the environment. It is learned through socialisation, schooling, and religious practices. The SMS model postulates that recall of AM requires activation by cues to access participants’ autobiographical knowledge base. Participants elaborate upon the given cue (often presented in the form of cue words) through mental imagery, which is then used to access the autobiographical knowledge base comprising lifetime period knowledge, general event knowledge, and event-specific episodic memory. Lifetime period knowledge refers to the general knowledge of significant others, common locations, actions, activities, goals, and plans that are characteristic of that period (e.g., when I was at boarding school) . Lifetime period knowledge often represents thematic information in memory description, which can overlap with other thematic knowledge. General event knowledge is more specific. A general event represents a set of related events and contains different pieces of memories that can be grouped into the same theme (e.g., I went to Penang with my friends, and we drove on the highway along the seaside and ate a lot of food that night). The key feature of episodic memory is vividness, in which people form mental imagery of their past experiences. Vividness encompasses the sensory-perceptual details of an event, including sounds, smells, movements and emotions .
AM specificity depends on the goals of working self. The idea of “self-discrepancy,” coined by Higgins , is often used to interpret this process. A large self-discrepancy—which is the discrepancy found among the actual self, ideal self, and ought self—normally causes a negative feedback loop, while a small discrepancy results in a positive feedback loop . These feedback loops have a direct effect on an individual’s current goals, intentions, or motives, which either inhibit or facilitate the effort to access the autobiographical knowledge base. If a positive feedback loop is formed, AM specificity is higher; in a negative feedback loop, specificity is reduced. A person’s ability to recall detailed past experiences indicates a high integration between goals and the working self . Therefore, the less integrated the goals and working self, the less likely one is to access event specific knowledge; thus, more general (or lifetime period) knowledge is retrieved. According to Conway and Pleydell-Pearce , when there is an incongruity between the goals of working self and the autobiographical knowledge base, the SMS breaks down in terms of its normal functionality. If the SMS remains nonfunctioning, and the disagreement between these two components unresolved, symptoms of confabulation, disjunctions, or schizophrenic delusions may occur [14, 17].
Overgeneral AM is common among patients suffering from various mental disorders such as anxiety , depression , and post-traumatic stress disorder (PTSD) . Deficiencies in social problem solving and feelings of increased hopelessness are associated with overgeneral AM . Three hypotheses have been proposed to explain this phenomenon, collectively known as the CaR-FA-X model, and consisting of: the capture and rumination (CaR) hypothesis, functional avoidance (FA) hypothesis, and impaired executive control (X) hypothesis . According to the capture and rumination hypothesis, people suffering from anxiety, PTSD, or depression, show a tendency to dwell upon events and thoughts which may monopolise working memory capacity, limiting the cognitive resources required to construct specific AMs . Patients tend to ruminate about things that concern them. In a cued recall paradigm, they map the cues onto their current concerns rather than elaborate the cues adequately to initiate a search for a specific AM . This mapping of cues and personal concerns results in the retrieval of abstract, self-related knowledge rather than specific AMs .
According to the functional avoidance hypothesis, patients retrieve overgeneral AMs to avoid negative affect linked to their traumatic life experiences . The retrieval of detailed AMs, especially the traumatic ones, leads to distress among patients. Overgeneral AMs are negatively reinforced to protect them from excess suffering . Lastly, the impaired executive control hypothesis suggests that construction of an AM requires the central executive of working memory to initiate and maintain the search within the autobiographical knowledge base . Any kind of interference with this process—either by distracting attention or overloading working memory—would lead to early search termination and thus, overgeneral AMs .
A recent meta-analysis  conducted on 20 studies, which included 571 patients with schizophrenia and 503 comparison participants, revealed that patients had lower levels of AM specificity, provided less detailed memories, and reported less conscious recollection than healthy controls. A large-to-medium effect size was reported for those three AM parameters. The meta-analysis also examined different methods being used to induce AMs in the patient population and whether those methods influenced the findings. No evidence was found to suggest it did. Several theoretical explanations were provided for why patients with schizophrenia were less likely to construct specific AMs (i.e., AMs that are less specific in meaning, recall time, people involved, and location or setting), including difficulty retrieving events that occurred in less than 1 day. First, the authors of the meta-analysis—in line with the CaR-FA-X model—proposed that dysfunctional executive functions, due to prefrontal cortex dysfunctions at both structural and molecular levels, are responsible for the patients not being able to construct AMs with enough detail.
Secondly, patients’ impaired ability to encode AM details results in the retrieval of less specific AMs. Due to executive dysfunction, the patients face difficulty linking and organising details of the memory for future recall; a phenomenon known as defective strategic encoding . These relational memory impairments described in schizophrenia [27, 28] point to defective functioning of the hippocampus . A significant positive correlation was observed between left hippocampal volume and the number of AM details recalled , suggesting that alteration of the hippocampus may contribute to AM impairment observed in patients. However, it is quite difficult to examine the relationship between defective strategic encoding and AM specificity as personal life events normally take place several years before the AM test. In addition, the events occurring before onset of the disease—likely to be the beginning of the defective strategic encoding—also suffer from less detailed recollection. Thirdly, patients with schizophrenia often have traumatic histories and employ emotional regulation processes, such as cognitive avoidance, which may prevent them from recalling AMs with enough detail. Normally functioning people, [31,32,33] as well as people with high stress levels,  were also found to use these same emotional regulation processes.
The results summarised above from this published meta-analysis  are updated and expanded upon in the current review. For example, we have reexamined the types of memory activation methods being used in published studies. We aim to also address a range of other issues related to patients’ AM. First, although the meta-analysis examined if different cueing methods induced AMs with varying specificity, we have reassessed this aspect as several new studies have been published since the 2016 meta-analysis. Second, we were curious to know whether patients’ current level of insight, comorbid depression, and history of attempted suicide influenced their memory recollection. Third, we relooked at the distribution of patients’ AMs across the lifespan. Although this aspect was thoroughly reviewed by Ricarte and colleagues , we aim to discover if their results would be altered due to the recent publication of several new studies. Fourth, the theoretical accounts highlighted in the meta-analysis received limited support, so we have thoroughly examined the interpretations offered by various authors and summarised them. Finally, we examined literature reporting the effects of various intervention programmes on the improvement of patients’ memory specificity.
Protocol developed for this review was registered in PROSPERO, an international prospective register for systematic reviews (registration no: CRD42017062643), and was executed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) Statement and flow diagram  (see Fig. 1).
The researchers searched PsycINFO, Web of Science, and PubMed databases for articles published between January 1998 and December 2018. Search terms were: “autobiographical memory”, “episodic memory”, “life story”, or “narrative”; and “schizophrenia”, “schizophrenia spectrum disorders”, “psychosis”, or “delusions”. Inclusion criteria were that studies must be quantitative, and: (a) published in an English language journal from 1998 to December 2018; (b) report on autobiographical memory (AM) data accumulated from patients with schizophrenia according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-III, DSM-IV, and DSM V), or the International Classification of Diseases (ICD-9, or ICD-10) criteria; (c) compare AM performance among patients with schizophrenia, and also to healthy controls; and (d) report on at least one measure of features, content, or specificity of AM.
The first and last authors of this paper assessed article quality using 14 criteria developed by Kmet and colleagues , including: research objective, design, method, participant, measures, sample size, data analysis, results, and conclusion (see Appendix A). They assessed and scored each paper independently and assigned article scores from 0 to 2 reflecting the degree to which the specific criteria were met or reported on (i.e., yes = 2, partial = 1, no = 0). Items not applicable to a given criteria were marked N/A and excluded from the final calculation. Discrepancies between the two reviewers were resolved through discussion.
The initial database literature search for the current review produced 3340 titles, of which 759 from Ovid MEDLINE, 1240 from PsycINFO, 1338 from Web of science, and 3 from other sources. After screening the titles, 485 articles were retained as the duplicates were removed. A total of 352 articles were further removed from this list after screening the abstracts, keeping only 133 articles for full-text review. The screening of full-text articles excluded another 76 articles. The remaining 57 articles were finally included in the current systematic review, and their data were extracted (see Table 1).
We present results in four sections reflecting the four main themes extracted from the literature: (1) methods to activate AM; (2) features of AM retrieved by patients with schizophrenia; (3) enhancing memory specificity and coherence; and (4) theoretical accounts employed to interpret the results.
Autobiographical memory activation methods
There were three activation/retrieval methods implemented in the reviewed studies: cue word/picture methods, life stages methods, and open-ended methods (see Table 2).
Cue word/picture method
Seventeen studies used cue words or pictures to evoke autobiographical memories (AMs) from patients with schizophrenia (see Table 2). Cues included pictures or positive and negative emotion words (e.g., the words happy and joyful were used as positive cues; the words insecure and lazy as negative cues). The cue word/picture methods implemented in 12 studies were adapted from Williams and Broadbent . The form (e.g., presented verbally or on cards) and number of cues in the reviewed studies varied. Several studies presented two cue sets (positive and negative) [38, 42, 43, 47, 54, 67, 72, 83], while others used three sets (positive, negative, and neutral) or defeat-related cues [52, 60, 63, 68, 80]. Sets of cue words employed varied. For example, McLeod and Wood  used happy, proud, relieved, pleased, excited, and hopeful as positive cue words, while Taylor and Gooding  used the words tender, excited, friendly, peaceful, and pleasant. Picture cues were also used , including 120 pictures (i.e., positive, negative, and neutral images) from the International Affective Picture System to stimulate participants’ emotions to evoke specific memories . One study  used cue-within-the-cue words adapted from an earlier study . After the patients retrieved a specific AM for each cue word, they were asked to title the memory; this title was used to evoke another memory in a subsequent trial . One study  applied the Narrative of Emotion Task, asking participants to construct their experiences based on simple (i.e., happy; sad), complex (i.e., surprised; suspicious), and self-conscious (i.e., ashamed; guilty) emotion words. Another study  used the Schedule for Deficit Syndrome  to prompt AMs through the use of emotion words (e.g., happiness, enjoyment, sadness, upset, and irritation).
Life stages method
The life stages method was found in 15 studies. The Autobiographical Memory Interview (AMI) , employed in five studies (see Table 2), was the second most often used assessment. In AMI, participants are asked to recall three events in great detail from each life stage: childhood, early adulthood, and recent life. The Autobiographical Memory Enquiry (ABME) , the most frequently used measure, appears in six studies (see Table 2) to induce patients’ AM in four life stages: (a) childhood to age 9, (b) ages 10 to 19, (c) age 20 to 1 year before the test, and (d) the current year. The Autobiographical Memory Inquiry —quite similar to ABME—appears in two studies (see Table 2), and also elicited the recollection of patients’ AMs in four life stages. The sole difference between these two measures lies in the representation of the second and third stages. The Autobiographical Memory Inquiry’s second stage is from age 11 to the age of symptom onset, and the third stage is from the age of onset to 1 year before the test . Two studies (see Table 2) employed the German E-AGI (Erweitertes Autobiographisches Gedächtnisinterview)  to elicit AM recollection. It prompts memories for five life stages: preschool, primary school, secondary school, early adulthood (i.e., until the age of 35), and the most recent 5 years. One recent study  employed the Questionnaire of Autobiographical Memory (QAM), including two scales measuring semantic and episodic AM recalled from three different life periods.
Open-ended retrieval method
In 26 studies (see Table 2), open-ended retrieval methods encouraged participants to freely recall life events without providing more than necessary preconditioned information (e.g., at a certain period of time, or in a certain mood). The two most frequently used open-ended retrieval methods were the protocol from the Indiana Psychiatric Illness Interview (IPII)  and the method to recall self-defining memories (SDMs) . While the former method was used in nine studies [45, 49, 56, 57, 79, 84, 86], the latter was used in six studies [58, 64, 66, 82, 85]. There were four sessions to complete the IPII. First, participants shared their life stories; next they described their psychological conditions, and thirdly, they shared their experience of having these conditions. Lastly, participants presented on how their conditions affected their lives. The SDMs used in six studies, required participants to recall three important memories to best define who they are and reflect their self-identities. Two additional studies [39, 50] asked participants to freely recall a number of past events and date them. One study  used a method  originally utilised by Holmes and Conway , in which participants freely recalled 20 important life events and provided an age and time for each.
Another open-ended retrieval method asked participants to keep a dairy. One study  encouraged participants to record four diary entries per day for 1 month, requiring participant motivation to complete this time consuming task for a successful study. Another study  employed the Twenty-Statements Test comprising “I am” statements to activate AMs and understand participants’ self-images and related AMs.
The Life Story Chapter  retrieval method was employed in one study  to elicit AM. It asks participants to recall their stories and divide them into chapters. Another three studies [78, 81, 83] used the Life Narrative method  which encourage participants to write down their seven most important events on cards, and then narrate them into a life story after arranging these cards in a temporal sequence.
Features of autobiographical memory
Cue word/picture method
Most studies using a cue word or picture method revealed that patients with schizophrenia tended to report less specific AMs [38, 47, 52, 53, 72], fewer total memories , and more categorical memories [38, 42, 47, 52, 53]. However, one study  found no significant difference in specificity of AM between patients and controls. Patients and controls responded differently to positive and negative cues. One study  reported that patients provided more specific AMs for negative cue words and less specific memories for positive cue words. These results contradict another study  in which patients responded to positive picture cues with more specific memories. One study  revealed that patients reported less clear but lengthy descriptions of AMs in response to negative cues; yet their memories were more likely to involve others when responding to positive cues. Patient memory retrieval time varied when responding to cues. In two studies [38, 52], patients took a longer time to complete retrieval compared to controls, while in an opposing study , patients responded more quickly to cues.
Anxiety and depression levels were found to be higher among patients with schizophrenia than controls [52, 60], and these levels were positively correlated with avoidance relating to their illness . Patients with depressive symptoms generated more general memories, especially towards positive cues; however, they seemed to have better insight regarding their psychological conditions than patients without depressive symptoms . Additionally, patients’ impaired ability to produce more specific memories to negative cues predicted lower insight into their illnesses .
The relationship between patients’ comorbid depression and memory specificity is not conclusive. One study  indicates that patients’ depression levels highly correlate with memory specificity. However, two studies [54, 72] reported no such relationship. Risk of attempted suicide was high among patients with schizophrenia . One study  revealed that patients with a history of attempted suicide reported higher levels of depressive symptoms and generated more specific AMs compared to patients without this history. Yet, another study,  reported that patients with a history of attempted suicide were more likely to produce less specific AMs compared to patients who have no such history.
Although patients with schizophrenia who take part in AM studies are generally stabilised by medication, their responses are occasionally “uninterpretable”. Thus, researchers find it difficult to make sense of how retrieval cues are related to the given memories for these responses . Specifically, when negative cues are used, some patients’ memory descriptions are quite scattered [38, 60]. In one study , the recall of less specific AMs was associated with more negative psychotic symptoms in patients. Another study  reported that patients with greater positive psychotic symptoms were more likely to produce less specific AMs. However, one study  stated no such relationship.
Nevertheless, one study  notices that patients’ memory specificity is not associated with psychotic symptoms, social functioning, depression, or anxiety, but with their executive function. Patients with negative symptoms offered shorter descriptions of their stories; the more first-person pronouns they used, the poorer understanding they had about other’s emotions and intentions (i.e., ToM) .
Cue word/picture studies mostly support the notion that patients with schizophrenia recall less specific, and more categorical, AMs, and respond differently to positive and negative cues than controls. The link between the history of suicide attempts and AM specificity, and the relationship between psychotic symptoms and AM specificity, remain unclear.
Life stages method
Studies grouped into this category implemented the life stages method to evoke participants’ AMs. Findings were similar to those studies using cue word/picture methods. For instance, AMs among patients with schizophrenia appeared to be less specific [40, 41, 44, 59, 69, 71, 74, 88], and fewer in number [44, 59, 69], when compared with controls. This method, however, produced unique results. When patients’ AM specificity was distributed over the lifespan, “U-shaped” patterns appeared [37, 47, 48]. The patients’ AM retrieval was most impaired for early adulthood [37, 47, 68], and least impaired for childhood [37, 68] and recent years . Research  suggests that early adulthood coincides with the onset of psychotic symptoms in many patients, resulting in less specific AMs. However, a recent study  has not confirmed these results, showing that patients’ memory performance from the recent years was poorer than for controls. Another study  found that the lack of memories from childhood was positively correlated with current psychotic symptoms.
When examining personal facts (i.e., semantic memories) in AMs, patients and controls demonstrated no difference . However, patients performed better when retrieving recent personal facts than those from childhood . The capacity for retrieving personal events (i.e., episodic memories) from all life periods was significantly impaired in patients compared to healthy controls ; however, opposing results from another study found that the deficit in recalling episodic memories only occurred in the recent life period  . One study  reported that patients tended to recall strange negative events from childhood, suggesting the possibility of having traumatic life experiences during childhood. Indeed, one review reported a causal relationship between childhood trauma, such as sexual and emotional abuse, and the patients’ current psychotic symptoms .
Researchers  revealed that mild depression correlated strongly with better memory recollection among patients with schizophrenia without retrieval training. They found that from 10 years old to the age of symptom onset (approximately 18–19 years), patients’ depression symptoms were lower while AM specificity was higher. This is consistent with the U-shaped retrieval pattern. After memory retrieval training [68, 75], patient memory retrieval improved, yet, there was no significant correlation between emotion and AM retrieval, indicating memory specificity levels were not related to changes in emotion (e.g., feelings of depression). Similar results were observed in another study  that found no relationship between depression and recollection.
Related to the ToM, one study  focused on how retrieval patterns illustrated that patients’ AM deficits were more strongly associated with a lack of ability to infer other’s intentions than to understand their emotions [108,109,110]. The researchers  indicated that patients with schizophrenia may have difficulty understanding other’s intentions or behaviors such as interpreting the meaning of conversations or body language. Another study  reported that patients’ capacities to retrieve past events were strong predictors of social performance.
One study  revealed that patients offered largely objective explanations of the importance of their memories, whereas controls provided mostly subjective explanations for their recalled memories. Older patients (i.e., mean age = 56) demonstrated significant impairment in AM (i.e., both episodic and semantic memories) compared to younger patients (i.e., mean age = 33) . Two studies [47, 68] employed cue word and life stages methods to collect patient AMs. These studies revealed that patients recollected more specific events when given word cues and recollected a greater number of total events in the life stages method.
Open-ended retrieval method
Twenty-six studies [39, 45, 46, 49, 50, 56,57,58, 61, 62, 64, 66, 70, 73, 78, 79, 81,82,83,84,85,86, 89] used open-ended retrieval methods. Under this method, the studies were more likely to focus on the quality of AMs, such as meaning making, content, insight, self-worth, coherence, temporal conceptual context, plausibility, and so on. In addition, the results were similar to those that used cue word/picture and life stages methods. Patients with schizophrenia produced fewer memories than controls , and their memory specificity was lower [50, 70]. Additionally, patients produced more memories with high specificity preceding the age of psychotic symptom onset , supporting the U-shaped memory retrieval from the life stages recollection method [37, 47].
The patients recollected most of their memories from 22 years of age as opposed to 27 years of age for controls; and patients’ reminiscence bumps were also earlier . Similarly, two studies [58, 85] reported patients’ reminiscence bumps to be temporally located from ages 15–19, and controls’ bumps from ages 20–24, or 25–29, respectively. Patients tended to recall more past events related to work and education than for births and deaths . Controls were more likely to recall their past through intense emotional events , supporting other results  indicating that patients provide an objective explanation for important events while controls provide a subjective explanation.
One study  reported that patients with schizophrenia had a tendency to recall more memories relating to hospitalisation or stigmatisation rather than achievement, as compared with controls. A similar theme was found in one study  in which patients with schizophrenia tended to retrieve more traumatic memories than controls: 71% of these memories related to psychotic episodes while 29% related to other events that contributed to their disorders. Three studies [78, 82, 83] discovered that patients often rated their past as negative; however, recalling negative experiences was not associated with their level of depressive symptoms .
The content of memory produced by patients appeared to be less coherent regarding the context and theme. As far as the meaning making of events, studies revealed that patients produced less meaning making than controls [58, 64, 66, 78, 86]. Additionally, patients tended to use less temporal coherence  and less causal (e.g., “because”), logical (e.g., “and”), and contrastive (e.g., “although”) words in their storytelling . But not all patient samples showed the same tendencies. Holm and colleagues  reported neither significant differences between controls and patients in terms of AM causal coherence and centrality to identity, nor the length of stories, their temporal coherence, number of life chapters, or themes produced .
Compared with healthy controls, patients’ AMs appeared to be lower in self-worth and agency [46, 73], meaning that they tended to connect with others passively, viewed the self as negative, and believed that their lives were not under their own control. These findings are supported by a recent study  stating that patients expressed their lack of fulfillment in agency and interpersonal relationships.
Patients’ insight into their own mental health conditions affected their AMs. Patients who denied the diagnoses or symptoms tended to have lower insight . The patients with low insight produced less detailed AMs that lacked temporal conceptual connection and plausibility . Vocational rehabilitation enhanced the AM coherence of patients with average insight, but did not for those with lower levels of insight . Some patients with more insight seemed to have increased social functioning (i.e., ToM) [49, 56] and abstract thoughts , and were more motivated and hopeful  in life. However, others appeared to be more depressive and have lower motivation in life . Patients’ poor levels of insight were associated with more psychotic symptoms  and with poorer quality AMs . However, their AM quality was not associated with their past experiences of being rejected socially .
In terms of patients’ language, the more first-person plural pronouns (i.e., we, us, and our) used, the more anticipatory pleasure and greater connection with their past they experienced , indicating that socializing with other patients was pleasant. Patients who stayed longer in care homes produced stories that delineated relationships and home activities, and were more coherent and less delusional compared to the stories produced by patients whose stay in care homes was shorter . In one study, patients were able to experience vividness of their past just like healthy controls , but an opposing result was observed in another study  in which the level of vividness was found to be lower in patients.
Various SMS schemes were employed in eight out of 57 reviewed articles to interpret why patients with schizophrenia often recall less specific AMs. According to these eight studies, this phenomenon of patient AM non-specificity might be due to the abnormality of personal identity , the disturbing concept of self , the goal of avoiding distressing memories , or unclear goals and intentions [47, 59, 87]. A defect in executive function was also suggested . The unconventional reminiscence bump  and frequency of reporting inconsistent memories  in patients with schizophrenia was attributed to the abnormal formation of life goals. Additionally, vague descriptions were provided while applying the SMS framework; it was not made clear how the goals and identity of an individual could play a role in the memory retrieval process.
Only three studies employed the CaR-FA-X model to illuminate the possible reason for less specific AMs in patients with schizophrenia [43, 72, 75]. The first study  emphasised that the executive function is crucial during retrieval. The second study  stated that avoidance played a role in producing overgeneral AM among patients. The third study  employed the ruminative hypothesis in the CaR-FA-X model to explain the reduction in specificity in AM among patients, however, the result was not supportive to the theory as the patients’ ruminative thinking pattern remained unchanged although their AM specificity significantly improved through training.
Some studies highlighted the importance of working memory, executive function [48, 67, 81, 89], and metacognition [45, 56, 58, 64, 78, 80, 82,83,84, 86, 88] in explaining high quality AM (e.g., AM with specificity, internal coherence, length of narratives, and temporal conceptual context). A few studies mentioned that schizophrenia itself disturbed patients’ AM, especially the onset of the illness [68, 69] and its psychotic symptoms [45, 46, 49, 53, 66, 85]. Other studies stated that patients’ attitudes  or emotional states [63, 65, 70] had a significant impact on their memory retrieval.
Results from the remaining papers did not apply any theoretical framework but offered some general interpretations. Some authors discussed inefficient encoding strategies as the reason for patients recalling fewer AMs [39, 40, 50], while others emphasised the abundance of unpleasant life experiences [38, 41, 60] and general retrieval deficit [39, 47, 51]. Two studies mentioned that patients with schizophrenia follow an overgeneral memory retrieval pattern without much elaboration .
Enhancing memory specificity and coherence
Several studies [45, 54, 68, 74, 75, 81] reported that patients’ memory specificity and coherence could be improved through both intervention and memory activation methods. Two studies from Ricarte and colleagues [53, 91], using different intervention and retrieval methods (i.e., life stage and cue-word), reported similar results that patient’s AM specificity and detail improved. However, the study , which employed Life Review therapy resulted in no change in patients’ moods or ruminative thinking patterns. The other study , which utilised event-specific training, resulted in differences in patients’ depression levels. These competing results are perhaps due to the intervention’s training objectives. Life Review therapy focused on positive past events, but did not make patients feel better afterwards. Event-specific training was more likely focusing on patients’ self-defining memories, which would be helpful in decreasing their depressive mood.
Blairy and colleagues  supported the results that AM specificity could be improved. They employed Cognitive Remediation therapy—exercising the recollection of memories through a written dairy. Although they were able to generate specific AMs, patients’ low moods remained. Holm and colleagues  discovered that patients reported greater unfulfilled communion, indicating that they wished to have close relationships or friendships. Future research could explore the correlation between patients’ moods and having close relationships.
Lysaker and colleagues  reported that narrative coherence of patients with an average level of insight was improved in a 5-month vocational rehabilitation programme. They believed that through working and interacting with others in the workplace, patients gained a sense of identity and recognised their personal potential, which then enhanced their narrative coherence. However, insight might be hard to obtain. One study stated that insight is culturally structured since patients’ insight levels are positively correlated with the insight of their family members .
Potheegadoo and his team  discovered that by adopting specific cues, patients with schizophrenia were able to recollect memories in detail with no difference in specificity from controls. The specific cues provided (e.g., “how did you feel when this event happened?”; “do you remember the thoughts you had at that very moment?”) might help patients to elaborate further while retrieving and constructing their memories. Patients might have difficulty expressing from their narrative exactly what researchers are looking for (i.e., a match with the scoring standard), as previous studies mention that patients’ ToM is weaker than controls [59, 68, 77]. More importantly, this study  highlighted an idea that the lack of specificity in AMs could be due to a lack of communication or elaboration skills, as the patients’ illness caused them to withdraw from social interactions.
Alle and colleagues  discovered similar results from adopting a more structured protocol to elicit patients’ AM (i.e., asking patients to write down the 7 most important events on 7 cards; narrate them into a full story after arranging them in temporal sequence). Either providing more specific cues, or a more structured protocol, would likely help patients with schizophrenia generate more specific memories. Future research could concern itself with the best method for accessing AM in patients with schizophrenia.
This systematic review has extracted four themes, which helped to answer our research questions. The first theme summarises all the memory activations methods commonly used in previous studies. The second theme highlights the features and content of patients’ AM together with the role of comorbid depression and history of suicidal attempt in memory specificity. The third theme synthesises the theoretical accounts of patients’ memory. The fourth theme summarises the ways by which one could enhance patients’ memory specificity and coherence. We discuss some additional findings on the relationships between psychotic symptoms and patients’ memory specificity.
Memory activation methods
Research invariably shows that all studies used the generative retrieval strategy: giving cues to evoke autobiographical memories. The presentations of cues were in either words, pictures, life stages, or open-ended questions. Some results appear common across studies regardless of cuing method. For example, patients with schizophrenia retrieve less specific AMs compared to controls—only three studies [58, 64, 67] illustrated no difference in AM specificity, and one study  stated no difference in length, number of life chapters, or temporal macrostructure.
Suicide attempts, comorbid depression, and AM specificity
Comorbid depression was common among patients with schizophrenia, with several studies reported patients having higher levels of depression compared to controls [52, 60, 71, 72, 78, 82, 88]. However, the relationship between patients’ level of depression and memory specificity was not clear. One study  indicated that patients’ depression levels were correlated with their memory specificity, while others showed no relationship between depression and memory specificity [54, 72], narrative disruption , negative life chapters , or memory recollection in the Field perspective . It was also found that although patients’ AM specificity improved through intervention, their levels of depression remained unchanged [54, 75], indicating the independence of depression and memory specificity. Evidence shows that patients with depressive symptoms have better insight than those without depression . Another study revealed that patients with higher levels of insight were more depressed; thus, were less motivated in life .
The patients with a history of attempted suicide generated more specific AMs compared to patients without such history . However, another study showed that patients with a history of attempted suicide were more likely to produce less specific AMs compared to patients without this history . These contradictory results could be attributed to the sample size and types of patients involved in the studies. While the first study recruited only outpatients (N = 60), the second study involved mostly inpatients (N = 23) and a smaller number of outpatients (N = 9). In a recent study, outpatients performed better in several neurocognitive tasks, such as processing speed, working memory, and attention, compared to inpatients . Better neurocognitive function among outpatients could explain why they, despite having a history of attempted suicide, were able to produce more specific AMs than inpatients.
Distribution of AMs across the patients’ lifespan
Studies [37, 39, 47] examining AM specificity illustrate patients having a U-shaped distribution, meaning they recollected more specific memories from childhood and recent years than early adulthood. However, the U-shaped retrieval pattern was absent in a recent study . The lifespan distribution of patients’ typical AMs demonstrated an earlier reminiscence bump compared to healthy controls: 15–19 years for patients, and 20–24 years for functioning individuals [50, 58]. The participants’ average age at events was 22 years for patients and 27 years for controls. The early reminiscence bump for patients is probably due to the early onset of their illness; in many cases in their early adulthood, which may have resulted in the reduced recollection of memories from that period . When functioning individuals were able to adequately encode events from early adulthood, the patients faced difficulty in doing so because of insomnia  and other neurodevelopmental abnormalities [115, 116]. As the patients were likely to show reduced awareness of the events taking place at a time when their disease symptoms started to surface, their memory recollection from that period dropped, resulting in the early closure of their reminiscence bump.
The identity account of the reminiscence bump [64, 117,118,119] could be employed to make sense of these findings. Normally, young people develop their self-identity during adolescence and early adulthood . If an individual goes through a normal developmental process, there will be a privileged encoding of many of the events occurring during this period and later integrated with their lifelong narratives, thus enhanced accessibility to those memories later in life . If an individual shows symptoms of schizophrenia during early adulthood, events occurring at that time would receive reduced attention and likely be disintegrated within their personal narrative. This is the reason for patients showing an inability to recall more memories from this period, resulting in an early closure of their reminiscence bump. The question that now arises what happens with the patients’ identity development process when they start experiencing schizophrenic symptoms for the first time. Does identity development pause during this period and recommence after a certain period when they start receiving medical care? Future research should focus on the seemingly uneven development of self-identity in patients with schizophrenia and how does that influence their memory recollection.
Effects of psychotic symptoms on AM
A few studies have ascertained that psychotic symptoms relate to certain AM characteristics among patients with schizophrenia. Studies revealed that negative psychotic symptoms (i.e., social withdrawal; decreased or lost speech; emotional response) were related to patients’ AM specificity , self-defining memories , number of memories recalled after diagnosis , elaboration using fewer words , and negative symptoms, which predicted the poor quality of the narrative . Since working memory was found to be a predictor of negative symptoms , a deficit in patients’ working memory might have affected their capacity to reminisce about their past.
Additionally, positive psychotic symptoms (i.e., hallucinations and delusions) were found to be related to AM specificity in one study ; however, the results were not corroborated in other studies [51, 54]. Furthermore, Alle and colleagues  discovered that the symptoms of illness were not related to self-continuity among outpatients (outpatients vs. inpatients appears to be an important variable in this research, but the type of patient samples are not clear in some studies). Also, positive symptoms appear to be associated with poorer temporal conceptual connection and plausibility in patient narratives , perhaps due to their low capacity for reality evaluation which is associated with positive symptoms . A recent study  found that patients with fewer psychotic symptoms were likely to recall their memories from adolescence with more emotion and sensation.
The second research question was what kind of theoretical accounts were employed to explain overgeneral AM in patients with schizophrenia. Several interpretations were offered aligning with the SMS framework . Primarily, patients’ overgeneral recall of AMs resembled General Event or Lifetime Period Knowledge as stated in the SMS. Issues such as abnormality in personal identity , disturbing self [47, 60], and unclear goals and intentions in patients with schizophrenia [47, 59] were held responsible for the less specific AMs. Impairments in executive function were also suggested to be responsible . Although there was no explicit indication in any study currently reviewed, the goals of working self—according to the SMS of Conway and Pleydell-Pearce —might play a key role in the lack of AM specificity.
The recall of less specific AMs indicates that patient goals of working self inhibit the construction of detailed memories by sampling information from the autobiographical knowledge base. This inhibition could be due to the discrepancy between the ideal self and actual self. There may be a large gap between knowledge of the past actual self and the perception of the ideal self. The larger the gap between selves, the more likely it is that a negative feedback loop is created , resulting in memory suppression or confabulation . The discrepancy between selves could be rooted in the developmental history of patients with schizophrenia.
We have observed that participating patients in the reviewed studies accessed medical support at the time of data collection. Their psychotic symptom onset began earlier, approximately in their late teens or early adulthood [37, 39, 40, 65, 72, 124], a crucial period for adult identity development . A struggle with psychotic symptoms at that time may have delayed the process of identity formation. Without proper support, training, or guidance, these individuals were not likely to function daily in work and relationships, causing a tendency to misinterpret others. Hence, it is inevitable that their developmental background, including a delay in adult identity formation, contributed to their goals of working self, which are affected by a significant discrepancy between selves.
The discrepancy between selves may results from the cuing method too, especially when emotional word cues were used to activate memories. The emotional words or pictures are more likely to induce discrepancy in participants’ current self and ideal self. Schoofs and colleagues reported that cues create self-discrepancy, causing the retrieval of less specific AMs by functioning student participants . Similar findings were reported among elderly people  as well as patients with borderline personality disorder and depression . There has been no study so far examining the relationship between self-discrepancy and overgeneral AM among patients with schizophrenia. This could be a focus of future studies.
Several studies suggested that people produce more general than specific memories because they want to minimise their self-discrepancy [126,127,128,129]. It is proposed that control of self-discrepancy is the nature of the goals of working self [14, 17]. The control of self-discrepancy is quite similar to the concept of a protective mechanism, as depicted in the functional avoidance hypothesis of the CaR-FA-X model. The protective mechanism functions to reduce discomfort and intense emotion . There has been evidence demonstrating that unwanted memories might be directly suppressed, even causing later forgetting [130,131,132,133] among healthy people. As a few researchers report [134, 135], sharing non-specific memories is a type of self-defense mechanism among people with personality disorder. For example, in an extreme attempt to minimise the gap between selves, it is possible for patients to say: I cannot remember, or I do not know, as their goals of working self guide them to escape a situation and maintain self-coherence.
The CaR-FA-X model was used to explain less specific AMs in patients with schizophrenia . In the reviewed articles, the executive function hypothesis was frequently employed for this purpose. This hypothesis suggests that to recall a specific and detailed AM, one has to initiate and conduct a conscious search within the autobiographical knowledge base which requires executive functions . As the executive function is often impaired in patients with schizophrenia, they show reduced capability to construct specific AMs. The capture and rumination hypothesis was mentioned in only two studies reviewed. According to the capture and rumination hypothesis, patients with schizophrenia are often preoccupied with disorganised thoughts or intrusive images, causing them a high level of anxiety [136,137,138] or depression [138,139,140], which may take up a huge portion of their working memory capacity; resulting in reduced cognitive resources to form specific AMs . The functional avoidance hypothesis did not receive any support from the studies we have reviewed.
Since the working self is crucial in the retrieval of AM and is incrementally shaped through the developmental process, examining patients’ upbringing would inform research by providing a better understanding of patients’ working selves. Although studies reviewed in this paper clearly show patients retrieving incoherent AMs, there is a dearth of evidence for the connection between cues dispensed and elicited memories. There is a potential gap between how patients and researchers make sense of patients’ reported memories; content labelled as uninterpretable may result from researchers’ judgments or perceptions.
Future research concerning AM in patients with schizophrenia could investigate their developmental stages, AM content, and sense making, particularly regarding their past. To attain these objectives, the life-story-interview method over the cue-word method seems better suited. Although the cuing method has some methodological advantages (e.g., consistency across participants), the life-story method can offer complete patient life narratives and highlight the most important influences, experiences, circumstances, issues, themes, and lessons of a lifetime [141, 142]. To ascertain how patients with schizophrenia make sense of their life and construct personal meaning and reality, the life story interview method is quite useful [143, 144]. This method is better able to show how patients organise, interpret, and create meaning from their life experiences, and how they maintain a sense of continuity.
Memory enhancement in patients
Several studies have reported that patients’ memory specificity and coherence could be improved through structured interview protocols with specific cues, cognitive training, and rehabilitation [45, 54, 68, 74, 75, 81]. Interestingly, the memory coherence was only improved in patients who had at least a moderate level of insight . When the interviewers asked very specific questions or presented with a specific cue, the patients were able to recall further detail of their life experiences. However, it is not made clear in the current studies if this memory enhancement was resulted from the cue itself or the process was moderated by a third factor, such as patients’ ToM. When more specific questions were asked, patients were able to realise what the interviewer’s expectation was; therefore, produced additional detail of their experiences. Future research should investigate the role of ToM regarding patients’ capability of recalling AMs. Various training and therapeutic interventions help to improve patients’ AM specificity, but the underlying cognitive processes deserve further examination. It is critical to understand if these interventions improve the patients’ self-perception and reduce their self-discrepancy, therefore positively affecting their memory recall.
This systematic review has incorporated all the most recent empirical research on the AM of patients with schizophrenia. Unlike previous reviews, it has revealed that memory activation method itself plays a critical role in whether an individual would recall a specific or overgeneral AM. This review highlights how the SMS framework could explain overgeneral and incoherent AMs of patients with schizophrenia. This review has, however, a few limitations. It only included quantitative studies. Results from both qualitative and quantitative studies should be analysed for a more comprehensive understanding of the AM of people with schizophrenia. Another limitation is that some studies involved only outpatients, some only inpatients, and others utilised both. Even some studies did not clearly mention the type of patients they involved in their studies. Additionally, the patients participating in the reviewed studies were at different stages of recovery because they were all undergoing treatment. These factors may have affected the results reported.
Directions for future research
Based on the reviewed research and extracted results, we offer some specific guidelines for future research. First, to see how patients with schizophrenia organise their past autobiographical knowledge, researchers could utilise the life chapters approach. This method has been used to investigate how patients suffering from major depressive disorder organise autobiographical knowledge within their past and potential future life chapters . Future researchers could ask their patients with schizophrenia to list their past and future life chapters in a meaningful way (e.g., college education, job with HSBC) and sort a given list of positive and negative attributes according to those chapters. It would be interesting to see if the patients delineate their life chapters with more negative than positive attributes compared to healthy controls, and if there are any differences between attributes picked for their past and future life chapters. This kind of research could shed light on aspects of past knowledge that are associated with schizophrenic symptoms. Second, future studies could compare AMs of inpatients and those at different stages of recovery. Third, it would be interesting to see how AM relates to other cognitive processes (e.g., rumination, avoidance, problem solving) in this population and how AM problems contribute to and maintain symptoms.
Finally, we suggest cross-cultural research on AM in psychosis as previous research has shown that functioning individuals representing either collectivist or individualistic cultures report AMs differently [146, 147]. We also recommend future research on memory training approaches and mechanisms of change in emotions and symptoms. Some longitudinal studies could be conducted, as there are few such studies on patients with schizophrenia. It would also be interesting to compare content and appraisals of memories produced by patients with schizophrenia. We strongly recommend research investigating life scripts produced by this population and a comparison of their life scripts with the cultural life scripts of healthy controls.
This review, following the PRISMA Statement guidelines, synthesised empirical findings published in 57 articles examining AMs in patients with schizophrenia. The features and content of AM, memory activation method, lifespan distribution of patients’ memories, and related aspects have been discussed. This review illustrates that most studies accumulated AMs through the generative retrieval process. Cuing methods such as words, pictures, life stages, and open-ended questions were used. Patients with schizophrenia were found to frequently recall more overgeneral memories. The patients who were still experiencing psychotic symptoms at the time of data collection were more likely to produce incoherent memories. While examining the lifespan distribution of specific memories, it was found that patients recalled more specific memories from childhood and recent years, but very few from early adulthood, forming a U-shaped distribution; however, this finding was not overwhelmingly consistent. Moreover, a typical reminiscence bump was found, but the patients’ bump started earlier than the bump exhibited by healthy controls. While patients exhibited the bump for 15–19 years of age, the controls exhibited it for 20–24 years of age.
The review indicates that patients’ AM specificity can be improved through retrieval training or by employing structured interview protocols with specific retrieval cues. Patients’ personal insights contributed to how they narrate their life stories, as their insight impacted on their mood. The relationship between history of suicidal attempt, level of depression and AM specificity was not conclusive; likely to be influenced by a third variable, such as patients’ stage of recovery, and patient type (i.e. inpatients or outpatients). Directions for future research to improve AM specificity in this clinical population were presented.
To explain overgeneral AM in schizophrenia, eight articles employed the SMS framework, three used the Car-FA-X model, and the rest did not use any theoretical account. The discrepancy between selves, dysfunctional working memory, unclear goals and intentions, and weaker ToM among patients, was held responsible for overgeneral AM. The reduction in recall of specific AMs from early adulthood was attributed to the lack of cognitive processing of the events due to the emergence of psychotic features during that period. Due to disease onset, events occurring during early adulthood were not processed to become integrated within the patients’ lifelong narrative, thus they were poorly recalled. Therefore, the earlier reminiscence bump for typical AMs in patients could be attributed to the early closure of the adult identity formation process.
Availability of data and materials
Data sharing is not applicable to this article as no datasets were generated or analysed during the current study.
Autobiographical Memory Enquiry
Autobiographical Memory Interview
Capture and Rumination, Functional Avoidance, and Impaired Executive Control
Diagnostic and Statistical Manual of Mental Disorders
Erweitertes Autobiographisches Gedächtnisinterview
International Affective Picture System
International Classification of Diseases
Indiana Psychiatric Illness Interview
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
Post-traumatic Stress Disorder
Theory of Mind
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The authors acknowledge the School Research Office for providing continuous administrative support to Yujia Zhang when she has conducted this systematic review.
The Department of Psychology at Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia has offered the open access publication funding support. The funding body has no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.
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Yujia Zhang is supported by a Higher Degree by Research Scholarship from Monash University Malaysia.
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Zhang, Y., Kuhn, S.K., Jobson, L. et al. A review of autobiographical memory studies on patients with schizophrenia spectrum disorders. BMC Psychiatry 19, 361 (2019). https://doi.org/10.1186/s12888-019-2346-6
- Autobiographical memory
- Cuing methods
- Self-memory system
- CaR-FA-X model