Perceptual organization in first episode schizophrenia and ultra-high-risk states

Deficits in perceptual organization have been consistently reported in schizophrenia, as has an association between these deficits, disorganized symptoms, and poorer premorbid functioning and prognosis, suggesting that they may be an index of illness severity or progression. It is unclear, however, whether the impairment is present at, or before the first psychotic episode. This study examined perceptual organization in young people considered to be at high-risk for schizophrenia, defined by the close-in strategy [Yung, A.R., McGorry, P.D., McFarlane, C.A., Jackson, H.J., Patton, G.C., Rakkar, 1996. Monitoring and care of young people at incipient risk of psychosis. Schizophrenia Bulletin, 22, 283-303]. The high-risk group (n=70) was compared to first-episode patients (n=54), and nonpatients (n=24) using a task with known sensitivity to perceptual organization deficits in schizophrenia, and whose scores have predicted long-term outcome and disorganized symptomatology in past studies [Knight, R.A., Silverstein, S.M., 1998. The role of cognitive psychology in guiding research on cognitive deficits in schizophrenia. In: Lenzenweger, M., Dworkin, R.H., (Eds.), Origins and Development of Schizophrenia: Advances in Experimental Psychopathology APA Press, Washington DC, pp. 247-295.; Silverstein, S.M., Knight, R.A., Schwarzkopf, S.B., West, L.L., Osborn, L.M. Kamin, D., 1996b. Stimulus configuration and context effects in perceptual organization in schizophrenia. Journal of Abnormal Psychology; 105, 410-420.; Silverstein, S.M., Schenkel, L.S., Valone, C., Nuemberger, S., 1998a. Cognitive deficits and psychiatric rehabilitation outcomes in schizophrenia. Psychiatric Quarterly, 69, 169-191., Silverstein, S.M., Bakshi, S., Chapman, R.M., Nowlis, G., 1998b. Perceptual organization of configural and nonconfigural visual patterns in schizophrenia: effects of repeated exposure. There were no differences between groups, and the first-episode group demonstrated non-significantly more sensitivity to stimulus organization than the other groups. When the high-fisk group was broken down into its 3 subgroups (A-family history of psychotic illness and recent drop of 30+ points in the GAF scale; B-history of attenuated psychotic symptoms; C-brief limited intermittent psychotic symptoms), only group A demonstrated evidence of impairment, but this group differed significantly only from first- and young, later-episode schizophrenia patients, not from nonpatients. These findings are consistent with recent data on pre-attentive processes in schizophrenia which indicate that performance is not impaired and may even be enhanced, early in the illness, with dysfunctions beginning with increased chronicity. (c) 2006 Elsevier B.V All fights reserved.