Hallucinogenic Drugs and Cerebral Deficit

Fifteen Ss who had used hallucinogenic drugs were compared with 15 similar Ss who had not, on three tests, shown to be sensitive to cerebral impairment. It was found that the drug Ss performed consistently poorer, and, on two of the tests, significantly poorer than did the nondrug users. It was suggested that hallucinogenic drug use may be causally related to cerebral deficit.