Perceptual asymmetry in psychosis-prone college students: evidence for left-hemisphere overactivation.
The hypothesis that psychosis-prone students demonstrate a pattern of exaggerated perceptual asymmetry across both left- and right-hemisphere dichotic-listening tasks (consonant-vowel [CV] and tonal contour discrimination) was investigated. Subjects who scored high on the Perceptual Aberration or Magical Ideation scale or both (n = 20) demonstrated a significantly exaggerated right-ear advantage on a CV task in relation to normal control subjects (n = 27) but showed a reduced left-ear advantage on a tone task. The hypothesis of exaggerated functional lateralization across hemispheres in the psychosis-prone subjects was not supported, but the results are consistent with a hypothesis of left hemisphere overactivation in this sample.
Overby
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Arizona State University.
D000328:Adult; D001143:Arousal; D001288:Attention; D004007:Dichotic Listening Tests; D004292:Dominance, Cerebral; D005260:Female; D006801:Humans; D008297:Male; D010555:Personality Inventory; D010897:Pitch Discrimination; D011618:Psychotic Disorders / Q000175:diagnosis / Q000523:psychology*; D012307:Risk Factors; D013067:Speech Perception