Table 1 Emotions classification as per content, verbal and audio cues

Anger

Irregular or fast speech with an attempt to stop individual violation or preserve dignity [41, 42].

Contempt

Humiliation, attempt to belittle or achieve superiority. Often with lack of respect or cruelty. Sarcasm, provocation, one-sided humor and hostility often seen [41].

Disgust

Involuntary repulsion [41].

Fear

Superficial and rapid breathing, accelerated speech, incomplete declarations, nervous laugher, difficulty to express themselves [41, 42].

Sadness

Slower or irregular speech, monotone, increases in pauses or duration of syllable pronunciation. Tendency to use a larger number of possessive pronouns [42,43,44].

Shame

Feeling of uselessness, powerlessness, negative self-evaluation [41].

Embarrassment

Inhibition of the capacity to do or say their thoughts, insecurity [41].

Interest

Open-ended questions, validations, respectful engagement in the discussion [41].

Surprise

Audible panting, brief emotion, fast and spontaneous [41].

Joy

Augmentation of the speed pressure, satisfaction, exclamation, excitement, laugher [42].

Neutral

Interactions with no speech or content valence [41]. Everything that cannot be identified as one of the above emotions are included in this category.