Lysergic Acid Diethylamide (Lsd-25): Xvi. the Effect on Intellectual Functioning as Measured By the Wechsler-Bellevue Intelligence Scale
The Journal of Psychology October 1, 1955 A. Levine, H. A. Abramson, H. A. Abramson et al. 21 citations
A single 100-microgram dose of lysergic acid diethylamide (LSD-25) produced measurable declines in intellectual functioning among healthy adult volunteers. Performance on the Wechsler-Bellevue Intelligence Scale dropped significantly after administration, with the most pronounced impairments occurring in subtests requiring sustained attention, concentration, and complex reasoning. Verbal and full-scale IQ scores decreased, while performance IQ showed mixed results. The findings suggest that LSD acutely disrupts higher cognitive processes rather than sensory or motor functions alone.