Effect of lysergic acid diethylamide (LSD-25) on the absolute visual threshold.

Abstract

"Dark-adaptation curves were obtained on nine normal Ss after administration of LSD. The drug raised the absolute visual threshold throughout the course of the curves, and there was a relatively greater effect on the photopic threshold than on the scotopic threshold. Variability in the threshold values was not increased, and . . . the elevation in threshold was not due to inattention, inability to concentrate, or interfering hallucinatory manifestations. The results are interpreted in terms of presently available electrophysiological findings with LSD." From Psyc Abstracts 36:01:1DK28C. (PsycINFO Database Record (c) 2006 APA, all rights reserved)