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Lienert GA. 
“Pharmakopsychologische Untersuchungen über den Abbau der geistigen Leistungsfähigkeit. (Bericht über den 20. Kongress der Deutschen Geseschaft für Psychologie, Berlin, Sept. 26-29, 1955)”. 
Verlag fur Psychologie. 1956;p144-147.
25 students were given 1.25 mcg/kg LSD [orally]. As the effects of LSD wore off, mental performance was studied by means of an analytical intelligence test (Sullwold) and a concentration test (Duker). The results of the tests were interpreted in the following way: mental performance exhibited, under LSD, an ontogenetical regression.
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