Auditory change detection in schizophrenia: sources of activity, related neuropsychological function and symptoms in patients with a first episode in adolescence, and patients 14 years after an adolescent illness-onset

Table 2 Response time and accuracy (mean and standard deviation) on an adjunctive visual vigilance test and an auditory discrimination of frequency deviant tones in younger and older groups of patients with schizophrenia and age-matched healthy comparison subjects

	EOS (N = 28)		C-EOS(N = 22)		S-14Y (N = 18)		C-14Y (N = 18)
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Visual vigilance	554	[162]	496	[125]	664	[211]	467	[82]
response time (ms)^#
Visual vigilance	92	[26]	97	[8]	98	[4]	100	[1]
task (% hits)*
Auditory discrimination	446	[92]	409	[61]	478	[80]	401	[61]
response time(ms)^##
Auditory	72	[23]	90	[11]	61	[29]	92	[12]
discrimination (% hits)*

Response latencies of the S-14Y group on the visual (t₃₃ = 3.6, P < .01)^# and the auditory discrimination (t₃₂ = 3.2, P < .01)^## were slower: both patient groups were less accurate than their respective controls (t_47,34 = -3.7, -4.2, P < .01) on the auditory task (*).

ISSN: 1471-244X