Primate vocalizations during social separation and aggression: effects of alcohol and benzodiazepines |
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Authors: | E M Weerts K A Miczek K A Miczek |
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Institution: | (1) Department of Psychology, Tufts University, 490 Boston Avenue, 02155 Medford, MA, USA;(2) Departments of Psychiatry and Pharmacology, Tufts University, 490 Boston Avenue, 02155 Medford, MA, USA;(3) Present address: Behavioral Biology Research Center, Johns Hopkins University School of Medicine, 5510 Nathan Shock Drive, Suite 3000, 21224 Baltimore, MD, USA |
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Abstract: | The most common group of squirrel monkey vocalizations, peeps, are emitted during different social situations including social separation, affiliative interactions, feeding and aggressive confrontations. The present experiments investigated whether peeps and other vocalizations emitted during different social contexts are pharmacologically altered in a similar manner. First, vocalizations were characterized during (1) social separation in juveniles, and (2) resident-intruder aggressive confrontations between dominant monkeys from different social groups. Then, the effects of alcohol (EtOH) and the benzodiazepine chlordiazepoxide (CDP) on vocalizations during social separation and during aggression were examined. Isolated juveniles emitted only one type of call, the isolation peep. Resident monkeys primarily emitted peeps, but also emitted cackles, chucks, noisy calls and pulsed calls. Aggressive peeps were similar in structure and frequency (kHz) to isolation peeps, but were shorter in duration. At the same doses, both CDP (0.3–3 mg/kg) and EtOH (0.1–1.0 g/kg)reduced explosive motor behaviors and isolation peeps in juvenile monkeys during social separation andincreased threat displays and aggression peeps in resident monkeys during confrontations with an intruder monkey from a different social group. Thus, similarly structured vocalizations that were emitted during social separation and aggression were very sensitive to EtOH and CDP, but the social context determined the direction and magnitude of effects. |
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Keywords: | Communication Vocalizations Primates Alcohol Benzodiazepines Aggression Social behavior Isolation |
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