Abstract
Types of incorrect responses made on the WAIS Similarities subtest were analyzed for groups of schizophrenic, brain-damaged, and general medical (normal control) patients, all male. The errors of the brain-damaged contained proportionately fewer attempts to respond conceptually than the other groups. The major difference between the normals and schizophrenics was the greater willingness of the latter to attempt a response, i.e., to avoid “don't know.” Although it was an infrequent type of response, schizophrenics were at the same time more likely to make explicit denials of similarity (“not alike”). This elevation in denial and depression in “don't know” was found to be more marked in married than in single schizophrenics.
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