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Lynch WJ. 
“The performance of LSD users on certain neuropsychological tests.”. 
Psychopharmacology Abstracts. 1971;10(12):650.
A group of 16 White young adults who claimed to have taken LSD at least once were compared on a series of psychological tests with a control group of the same size. The groups had similar level of education, age, and socioeconomic background. The tests employed included the Wechsler Adult Intelligence Scale (WAIS), Halstead-Reitan Neuropsychological Battery and Minnesota Multiphasic Personality Inventory (MMPI). Significant intergroup differences were found on the following tests: -Object Assembly Subtest of the WAIS and on the F (false) and MA (hypomania) scales on the MMPI. The results are interpreted as failing to support the hypothesis that LSD use causes demonstrable brain damage. Differences between the LSD user and the nonuser's personality are discussed. The difficulties and shortcomíngs of the post facto design employed are considered and possible improvements are suggested.
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