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Jarvik ME. 
“Behavioral Effects of Drugs in Monkeys”. 
Psychopharmacol.Bull.. 1976;12(2):62-63.
The effects of drugs on discrimination learning and shortterm memory in monkeys were studied. Lysergic acid diethylamide (LSD) and dimethyltryptamine (DMT) produced significant overall changes in the behavior of unrestrained rhesus monkeys. Increases in the frequency of yawning, stereotypy, spasms, rocking, fear grimaces, and tracking, as well in the frequency and duration of inappropriate behavior were seen. Decreased self-clasping, vocalization and exploration time were also seen. Although some of the hallucinogen doses were associated with increases in perceptual/ motor behavior, the increases were neither large nor consistent enough to warrant confirmation of the notion of hallucinatory stimuli. Preliminary analysis of data from studies conducted in darkness indicate that the attenuated visual environment may allow for emission of considerably more hallucinatorylike behaviors. Drugs under study include chlorpromazine, scopolamine pentobarbital, amphetamine, morphine sulfate, ethyl alcohol, N2O, mescaline, marihuana and nicotine.
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