A previous study used learning of hand signals to show that observers practice the model's responses during the exposure period. Since only overt practice was measured, it was felt that more sensitive techniques were needed to measure possible covert practice. In this study, electromyogram (EMG) recordings were made while observers learned hand signals and word-number pairs, either in the presence of the experimenter or alone. Observers showed greater EMG activity while learning hand signals than while learning word-number pairs regardless of whether the experimenter was present or not. However, more overt practice of the hand signals (hence larger EMGs) occurred when the experimenter was absent. The results are interpreted as additional evidence for the elicitive function of the model's behavior during observational learning. Typically, observational learning studies involve two stages: a stage in which an observer is exposed to the behavior of a model, and then a stage in which the observer is required to behave in order to determine how much the model's behavior has influenced the observer's behavior. Relatively little research has attempted to analyze the observer's reactions to the model's behavior during the exposure stage-even though identification of these reactions could, presumably, facilitate more precise analysis of the processes involved in observational learning. Still, some efforts in this direction have been made,1 and it has, for example, been found that observers Received for publication June 10, 1969. The study is based in part on Deborah Smith Irwin's undergraduate honors thesis. It was supported by National Science Foundation Grant GS-1702 to the first author. Send reprint requests to the first author at the Department of Psychology, University of Massachusetts, Amherst, Mass. 01002. 1 A. Bandura and T. L. Rosenthal, Vicarious classical conditioning as a function of arousal level, J. pers. soc. Psychol., 3, 1966, 54-62; S. M. Berger, Conditioning through vicarious instigation, Psychol. Rev., 69, 1962, 450-466; V. Di Lollo and S. M. Berger, The effects of apparent pain in others on observer reaction time, J. pers. soc. Psychol., 2, 1965, 573-575; E. W. J. Faison, N. Rose, and J. E. Podell, A technique for measuring observable audience reactions to training films, Air Force Personnel and Training Research Center, Training Aids Research Laboratory, unpublished laboratory note (mimeo.), TARLLN-55-45, 1955.
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