Baum (1969) found that the presence of a nonfearful rat during response prevention facilitated fear reduction. However, Baum used the problematic “reduction in the conditioned avoidance response” as a measure of fear. The present study re-examined the social facilitation effect by examining approach behavior as an index of fear. 60 male rats either received or did not receive response prevention. These treatments were presented either alone or in the presence of a mobile or immobile nonfearful rat. Although all measures of fear showed significant response prevention, none showed social facilitation. The discrepancy between these results and those of Baum was explained by hypothesizing the conditioning of incompatible responses within the context of avoidance procedures.
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