Date of Defense
In the presence of its mirror image a Gamecock was presented with alternating periods of food reinforcement and periods of extinction for key pecking. An initial high rate of aggressive behavior to the mirror was observed, which subsequently decreased over sessions. After sixty days of no sessions aggressive behavior was again recorded but showed no decrement over sessions. The presence of a mature hen in the home cage during the later sessions or seasonal change were suggested as possible factors producing the different levels of aggressive behavior observed. No correlation was found between aggression and the food reinforcement schedule.
Fabry, Bernard, "The Effects of Long Term Exposure to a Mirror and a Reinforcement Schedule on the Aggressive Behavior of the Gamecock" (1971). Honors Theses. 1036.
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