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Generalization of free-operant avoidance behavior in pigeons.
Journal of the Experimental Analysis of Behavior
|January 1, 1974
Summary
Pigeons learned to distinguish between tones and noise during avoidance training. Their responses supported gradient interaction theory by showing predicted and actual generalization gradients matched.
Area of Science:
- Behavioral Psychology
- Animal Learning Theory
- Auditory Discrimination
Background:
- Pigeons were trained on a free-operant avoidance schedule using treadle pressing.
- Auditory discrimination training involved alternating components of avoidance and no shock, paired with distinct auditory stimuli (tone vs. white noise).
Purpose of the Study:
- To investigate auditory generalization gradients in pigeons following discrimination training.
- To test Spence's (1937) gradient interaction theory by comparing predicted and empirical post-discrimination gradients.
Main Methods:
- Three groups of pigeons underwent auditory discrimination training with differential reinforcement.
- Generalization tests were conducted with and without scheduled shocks.
- Interdimensional and intradimensional discrimination training were employed across groups.
Main Results:
- Interdimensionally trained pigeons exhibited excitatory and inhibitory generalization gradients along the tone frequency dimension.
- A predicted post-discrimination gradient, derived from algebraic summation, closely matched the empirical gradient from intradimensionally trained pigeons.
Conclusions:
- The findings support Spence's gradient interaction theory.
- The study demonstrates the utility of gradient summation in predicting animal behavior following discrimination learning.