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Chrysippus's pigeon: Exclusion-based responding in an avian model
Marisol C Lauffer1, Leyre Castro1, Edward A Wasserman1
1Department of Psychological and Brain Sciences, The University of Iowa.
Journal of Experimental Psychology. Animal Learning and Cognition
|December 13, 2016
Summary
Pigeons demonstrated inference by exclusion, a cognitive strategy where they deduced correct responses to new stimuli. This behavior suggests a mechanical process underlying complex decision-making in animals.
Area of Science:
- Cognitive Psychology
- Animal Behavior
- Comparative Cognition
Background:
- Inference by exclusion involves deductive reasoning when encountering novel stimuli within familiar contexts.
- Understanding this cognitive process in animals provides insights into the evolution of complex decision-making.
Purpose of the Study:
- To investigate exclusion-based responding in pigeons using a discrimination task.
- To determine if pigeons utilize an exclusion rule when presented with familiar and novel stimuli concurrently.
Main Methods:
- Pigeons were trained on a two-alternative forced-choice discrimination task with stimulus-response pairings.
- Stimulus-response associations were altered in Phase 2, introducing novel stimuli (E and F) alongside familiar ones (A and B).
Main Results:
- Pigeons initially responded incorrectly to familiar stimuli (A and B) in Phase 2, as expected.
- Crucially, pigeons showed below-chance accuracy for novel stimuli (E and F), indicating the application of an exclusion strategy.
Conclusions:
- Pigeon performance is consistent with an exclusion rule-based strategy.
- This exclusion behavior may stem from underlying processes like acquired equivalence formation.
