Rhesus monkeys in primate chairs were conditioned to bar press within 6 seconds of presentation of a light in order to avoid electric shock. Following acquisition of this avoidance response two animals were placed facing each other and the bar was removed from the chair of one monkey and the stimulus light from the chair of the other. In order for either monkey to avoid shock a communication was necessary since neither animal had access to all elements of the problem. The results indicated that through nonverbal communication of affect an efficient mutual avoidance was performed. It was concluded that this paradigm is an exceptionally efficient and sensitive method for investigations of nonverbal communication. *NOTE an interesting error in the initial attempt: the "stimulus" monkey was not wired properly to the shock cuff, maintaining its conditioning due solely to the fear/pain of the "response" monkey.
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