Corvid re-caching without 'theory of mind': a model

Area of Science:

• Animal Behavior
• Cognitive Science
• Neuroscience

Background:

• Scrub jays exhibit complex caching behaviors, including re-caching when observed, leading to debate about their cognitive abilities.
• Existing explanations involve either advanced social cognition (theory of mind) or numerous ad-hoc behavioral rules.

Purpose of the Study:

• To propose and test a novel theory explaining scrub jay caching and re-caching behaviors as a consequence of stress-induced memory errors.
• To investigate whether sophisticated social cognition is necessary to account for observed caching patterns.

Main Methods:

• Development of a 'virtual bird' model incorporating basic corvid cognition assumptions and a human memory model.
• Simulation of caching and re-caching behaviors under varying conditions of observer presence, dominance, and caching proximity.
• Comparison of simulated 'virtual bird' behavior with experimental data from real scrub jays.

Main Results:

• The 'virtual bird' replicated real scrub jay re-caching patterns, influenced by being watched, onlooker dominance, and caching distance.
• Simulated behavior occurred without the 'virtual bird' possessing a theory of mind or employing complex social reasoning.
• A single, learned behavioral rule, combined with stress-induced memory errors, sufficiently explained the observed patterns.

Conclusions:

• Scrub jay re-caching behaviors can be explained by stress and memory errors, rather than sophisticated social cognition.
• The proposed theory offers a simpler, unified explanation for diverse caching patterns.
• The findings provide testable predictions for future empirical research on corvid cognition.