Validation of the schizophrenia-organicity scale with brain-damaged and non-brain-damaged schizophrenics.

Abstract

Watson had developed a Schizophrenia-Organicity (Sc-0) Minnesota Multiphasic Personality Inventory scale that successfully distinguished schizophrenic from braindamaged patients. The present study used this Sc-0 scale to distinguish organically impaired schizophrenics from nonimpaired schizophrenics. Forty-eight schizophrenic subjects were divided into the organic and nonorganic groups by findings from both their Halstead-Reitan Impairment rating and the physical neurological examination. £-test analyses and cutting scores were calculated for the two groups. The results demonstrated that the Sc-0 scale could not distinguish impaired from nonimpaired schizophrenics. Future research and clinical implications are discussed.

The schizophrenia-organicity (Sc-o) and psychiatric-organic (P-O) MMPI scales: A review

“…We therefore suggested that the scale's discriminating power probably lay primarily in its ability to detect functional pathology rather than in a relationship with traits unique to brain damage. Several later authors (e.g., Andersen, Felling, & Seitz, 1970;Halperin, Neuringer, Davies, & Goldstein, 1977;Holland, Lowenfeld, & Wadsworth, 1975;Ruff, Ayers, & Templer, 1977) confirmed this speculation.…”

“…While the Golden, Sweet, and Osmon paper documents the ability of the scale to separate brain-damaged from schizophrenic patients, the hit rates reported were lower than those in any previous study on male Ss. Halperin et al (1977) attempted to determine whether SC-0 could differentiate brain-damaged schizophrenics from schizophrenics without brain disorders. They compared the Sc-0 scores of schizophrenics with high and low Halstead impairment index "his error is not limited to the Ruff-Ayers-Templer group.…”