Date of Award:


Document Type:


Degree Name:

Doctor of Philosophy (PhD)



Committee Chair(s)

Carl D. Cheney


Carl D. Cheney


Three White King pigeons were exposed to a fixed-time 120-second food delivery schedule and a live target pigeon. In order to evaluate whether induced aggression can take place in time periods other than immediately after food delivery, the target bird could be attacked (l) throughout the interfood interval; (2) after fixed post-food times had elapsed, or (3) after random post-food times had elapsed. When target availability was continuous or limited to random 30-second periods of the interfood interval, attacking was greatest after food delivery and decreased thereafter. Attacking did not predominate in any 15-second target access period occurring 15, 45, or 75 seconds after food delivery. Rather, more attacking took place during these time periods than immediately after food delivery when the target was continuously available. When the target could be attacked after 15, 45, or 75 seconds had elapsed until food was delivered, attacking decreased as a function of post-access time. Results demonstrate that schedule-induced aggression is not limited to the immediate post-food period. The temporal course of attack under limited access procedures may depend on whether the tar get is presented after fixed versus random post-food times.



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