Two experiments were performed in an attempt to relate sleep stages with overnight memory of consonant trigrams and paired-associates. In Exp. 1, a 20-min. learning task before sleep did not alter sleep patterns of a group of high school and college students. Further, neither delta sleep nor REM sleep nor their interaction reliably correlated with recall in the morning. In Exp. 2, the effect of pharmacological alteration of the sleep pattern was assessed. Despite a large suppression of REM sleep and concomitant elevation of stage 2, recall and relearning in the morning were not different from non-drug values. These results indicate that no sleep stage is uniquely favorable or unfavorable to verbal memory.
A neuropsychological assessment stressing lateralized perceptual-motor and cognitive abilities was administered to two groups of hospitalized child and adolescent psychiatric patients, 25 schizophrenics and 25 non-psychotics. The findings included an increased incidence of crossed eye-hand dominance in schizophrenics, poorer tactile sensory function in the right hands of schizophrenics than in the left hands, and lower Vocabulary and Similarities WISC subtest scores than Block Design and Object Assembly scores for schizophrenics. Right-left confusion was associated with finger agnosia for schizophrenics. The results supported the hypothesis that there may be left-hemisphere dysfunction in schizophrenia; however, no single pattern of dysfunction was apparent.
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