The effects of microdose LSD on time perception: a randomised, double-blind, placebo-controlled trial
Psychopharmacology November 26, 2018 Steliana Yanakieva, Naya Polychroni, Neiloufar Family et al. 169 citations
Microdoses of LSD (5, 10, and 20 μg) caused older adults to over-reproduce time intervals of 2000 milliseconds and longer, with the strongest effect at 10 μg. This temporal dilation occurred without noticeable changes in perception, mentation, or concentration, and was independent of any subjective drug effects. The findings suggest that LSD can directly alter interval timing at doses too low to produce conscious psychedelic effects, indicating a dissociation between neurochemical influences on time perception and altered states of consciousness.