Visual figural aftereffect in schizophrenic and nonschizophrenic patients.

Controlling for possible treatment effects, medication, E bias, and constancy of fixation, schizophrenic patients were found to have a smaller figural aftereffect than a nonschizophrenic group. Earlier reports of displacement of the T figure toward the I figure in schizophrenic patients were confirmed. 10 of the 11 Ss who did not maintain constant fixation were schizophrenic patients. This finding was discussed in relation to reports of a smaller figural aftereffect in this type of patient.