| Sumario: | The article discusses changes in recognition thresholds associated with chlorpromazine, promazine and Phenobarbital. This study attempts to determine whether for schizophrenic patients there would be any consistent changes in recognition threshold of tachistoscopically presented simple stimuli as a result of treatment with two phenothiazines (chlorpromazine and promazine) and Phenobarbital. It was found that with normal subjects using the Continuous Performance Test there was a significant decrement following administration of chlorpromazine. Furthermore, using three dosage levels (100, 200, and 400 mg.), it was found that higher dosages led to greater impairment than lower dosages.
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