Comparing triggers to visual disturbances among individuals with positive vs negative experiences of hallucinogen-persisting perception disorder (HPPD) following LSD use

Shaul Lev-Ran, Daniel Feingold, Craig Goodman, Arturo G Lerner
American Journal on Addictions 2017, 26 (6): 568-571

BACKGROUND AND OJECTIVE: Exploring differences in visual disturbances and triggers between Hallucinogen-Persisting-Perceptual-Disorder (HPPD) Type I ("positive/benign") and II ("negative/distressing").

METHODS: Forty individuals with HPPD and prior LSD use completed clinical questionnaires.

RESULTS: The most common type of visual disturbances among individuals with HPPD I and II was slow movement of still objects and trailing phenomena, respectively. Those with HPPD I were more likely to report experiencing disturbances in dark environment, while looking at a still or moving object and during sexual intercourse.

DISCUSSION AND CONCLUSIONS: HPPD I and II differ in terms of visual disturbances and triggers, possibly representing different phenomena existing on the same spectrum.

SCIENTIFIC SIGNIFICANCE: Our study indicating differences in triggers to HPPD I and II adds to existing literature on differences in visual disturbances between the two subtypes. Further research elucidating additional differences between the subtypes of HPPD is needed. (Am J Addict 2017;26:568-571).

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