Abstract
An electroencephalographic (EEG) protocol was used to investigate a left hemisphere overactivation hypothesis of psychotic-like experience, by examination of the cerebral activity of non-clinical participants selected for their extreme scores on two tests of schizophrenic-like personality tarits; the Schizotypal Personality Questionnaire (SPQ) and the STA scale. Power in the alpha band (8–12 Hz) was recorded while participants performed standardized cognitive tasks which engage the appropriate hemeisphere reliably. Those participants with raised schizotypy scores tended towards left hemisphericity and exhibited significantly less bilateral alpha power than those with lowered schizotypy scores. This is interpreted as offering tentative support for a left hemisphere overactivation hypothesis of psychotic experience.
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