The effects of the hallucinogen N,N-dimethyltryptamine (DMT) on the behavior of two island groups of four champanzees each were studied. One target animal from each group was selected for treatment and individual and social behaviors were scored according to a quantitative observational system. Low doses of DMT (.5-3.0 mg/kg) caused dose-dependent increases in duration of vocalization, fear grimace, and locomotion. Higher doses (4.0 mg/kg) tended to decrease these behaviors as well as others such as self-grooming. Social aggregation tended to decrease with increasing doses, and social interactions between target animals and others were rare. Results tended to support the hypothesis that hallucinogens increase social spacing and isolation.
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This research was supported in part by USPHS Grant MH23880 to Murray E. Jarvik, MD, PhD. We thank S. Craig,M. Tennet, D. Dooley, P. Quinn, and J. Kobrin for cooperation and assistance at Lion Country Safari. We thank P. Mdinnis of the Standard Outdoor Primate Facility for advice and criticism in the planning of this study.
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Brower, K.J., Siegel, R.K. Hallucinogen-induced behaviors of free-moving chimpanzees. Bull. Psychon. Soc. 9, 287–290 (1977). https://doi.org/10.3758/BF03337001
- Social Spacing
- Target Animal
- Social Aggregation
- Aggregation Score