Analysis of task requirements in schizophrenic concept-identification performance

Two experiments were performed to examine the effects of manipulating concept-identification task requirements involving (a) discrimination (DC cue type), (b) discrimination plus symbol manipulation (DS cue type), and (c) retention of concept information on correct identifications, false-positive errors, and response latencies for 3 levels of schizophrenic pathology and nonpsychotic Ss. Results of Exp. I indicated a differential set of cue type on pathology level. Latencies for correct “yes” responses were greater than for correct “no” responses. The size of this difference was negatively related to pathology level. A predominance of false-positive errors was accounted for by a partial recall explanation. Results of Exp. II indicated that simultaneous presentation procedures improved schizophrenic performance which supported a partial recall explanation. The importance of experimental manipulation of concept task variables in “psychological deficit” investigations was discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved) (from the journal abstract)