Both patients and controls performed well and there was no significant difference in their performance. Patients had 98.4% (S.D. = 1.4) and controls 98.1% (S.D. = 1.3) correct responses to targets (t = 0.99, df = 38, P = 0.33). They made few false alarms to nontargets or novel stimuli (patients = 1.4%, S.D. = 1.3; controls = 1.0%, S.D. = 1.2; t = 0.99, df = 38, P = 0.33). The groups also showed comparable mean reaction time to targets (patients = 458 ms, S.D. = 79; controls = 420 ms, S.D. = 82; Group: t = 1.76, df = 38, P = 0.09).
