Twenty schizophrenics without evidence of organic factors in their clinical condition and 20 controls chosen from hospital personnel were tested for adaptation to a brief visual displacement of their hand images. Using an optical-displacement apparatus involving psychomotor performance, the schizophrenic group showed significantly less compensatory, or adaptive, shift in their performances following the optical-displacement procedure. This result was interpreted to support previous work which appears to indocate that schizophrenics are deficient in integrating proprioceptive and visual information under conditions in which the normal patterning among sense modalities is disrupted.
Ebner E, Broekema V, Ritzler B. Adaptation to Altered Visual-Proprioceptive Input in Normals and Schizophrenics. Arch Gen Psychiatry. 1971;24(4):367-371. doi:10.1001/archpsyc.1971.01750100077012