Cognitive impairment is common in psychosis and has recently been observed in individuals at clinical high risk (CHR) of developing psychosis. The purpose of this study was to characterize longitudinal change in cognition among CHR individuals, and compare cognition of CHR individuals who later convert to psychosis to that of CHR who do not convert. Participants were tested at baseline and followed-up after six months using a comprehensive cognitive test battery.

Barbato M, Colijn MA, Keefe RS, Perkins DO, Woods SW, Hawkins KA, Christensen BK, Addington JM. The course of cognitive functioning over six months in individuals at clinical high risk for psychosis.  Psychiatry Research, 2013; 206(2-3): 195-199.