ATTACK PRODUCED BY INTERMITTENT REINFORCEMENT OF A CONCURRENT OPERANT RESPONSE 1

Abstract

Squirrel monkeys pressed a lever to produce food on several fixed‐ratio schedules; they could also bite a rubber hose. Biting attack occurred during the postreinforcement pause and in early portions of the ratio response run. Also, biting attacks increased after transitions to higher values of the fixed‐ratio requirement and in extinction. The results show that extinction‐induced aggression effects occur in primates.