Table 1.

Demographic information, symptoms, and performance on the auditory oddball task

Variable	Healthy controls	Schizophrenia patients
Demographics
N	50	58
Gender (# male)	34	45
Handedness (# right)	48	53
Age (mean; SD)	34.88 (12.82)	37.57 (12.68)
Auditory oddball performance	Mean (SD)	Mean (SD)
Trials	29.00 (0.08)	28.99 (0.12)
Hits*	24.80 (4.76)	22.73 (5.40)
Errors	1.56 (2.81)	2.38 (3.60)
Late*	0.31 (0.56)	0.61 (0.89)
Missed	2.63 (3.33)	3.88 (4.11)
False Positives	1.26 (1.82)	1.72 (2.01)
Accuracy*	85.5%	78.54%
RT – Hits**	396.10 (62.59)	444.98 (84.48)
RT – Errors	450.53 (109.81)	494.54 (117.67)
RT – Late	1,181.17 (108.26)	1,170.93 (91.56)
Symptom ratings (patients only)	Mean (SD)	Range
Affective flattening	1.60 (1.75)	0–5
Alogia	0.97 (1.31)	0–4
Avolition‐apathy	2.55 (1.34)	0–5
Anhedonia‐asociality	2.60 (1.41)	0–5
Attention	0.86 (1.24)	0–5
Severity of hallucinations	2.16 (1.85)	0–5
Severity of delusions	2.38 (1.60)	0–5
Severity of bizarre behavior	0.83 (1.26)	0–4
Positive formal thought disorder	0.95 (1.38)	0–5

Note. RT, reaction time; SD, standard deviation; * = P < 0.05; ** = P < 0.001.