Male cockroaches (Periplaneta americana) were exposed to either escapable, inescapable, or no shock in an escape task for three consecutive days. 24 hr. later they were placed individually in an aquarium with a naive cockroach and the frequency of aggressive behavior and defensive behavior was recorded by a blind observer. The inescapable shock group of cockroaches displayed less aggressive behavior and a greater tendency to retreat from social encounter than the escapable shock or no shock groups.
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