The Journal of Psychology
April 1, 1955
Murray E. Jarvik, Harold A. Abramson, Martin Hirsch
50 citations
Lysergic acid diethylamide (LSD-25) was administered to participants to examine its effect on recall and recognition of various stimuli. The results indicated that the drug impaired both recall and recognition performance compared to a control condition. The magnitude of the impairment varied depending on the type of stimulus material, with some stimuli showing more pronounced deficits. The authors suggest that LSD-25 disrupts memory processes, particularly in tasks requiring retrieval of previously presented information.
Journal of Abnormal & Social Psychology
November 1, 1955
Murray E. Jarvik, Harold A. Abramson, Martin Hirsch
32 citations
Five participants were tested nine times under two placebos (tap water) and seven drugs: ergometrine, alcohol, scopolamine, BOL-148, methamphetamine, LAE-32, and LSD-25. They completed a questionnaire about perceptual, physiological, and cognitive states before and 0.5, 2.5, and 4.5 hours after each dose. Differentiation among three lysergic acid derivatives and among alcohol, methamphetamine, and scopolamine was not clear, but the number of responses to the questionnaire under these drugs was clearly greater than under water. LSD-25 produced the most frequent and largest positive responses.
The Journal of Psychology
October 1, 1955
Harold A. Abramson, Murray E. Jarvik, Adam I. Levine et al.
22 citations
Substituting a tap water placebo for lysergic acid diethylamide (LSD-25) produced effects in participants that were similar to those of the drug itself, indicating that placebo responses can mimic hallucinogen-induced experiences. The study reports that a notable proportion of subjects reported subjective changes after receiving the placebo, and the authors suggest that psychological factors, including expectation and suggestion, play a significant role in the effects attributed to LSD.
The Journal of Psychology
April 1, 1955
Murray E. Jarvik, Harold A. Abramson, Martin Hirsch et al.
14 citations
Lysergic acid diethylamide (LSD-25) was tested for its effect on arithmetic test performance. Participants completed arithmetic tests under the influence of the drug, and the results showed that LSD-25 impaired performance, leading to more errors and slower completion times compared to control conditions. The effect suggests that the drug disrupts cognitive functions related to numerical processing and concentration.