Inhibitory control and cue relevance modulate chimpanzees' (Pan troglodytes) performance in a spatial foraging task

Area of Science:

• Comparative psychology
• Cognitive science
• Animal behavior

Background:

• Inhibition tasks assess self-control but may conflate inhibitory control with learning and object knowledge.
• Existing tasks in comparative psychology rarely isolate the contribution of inhibitory control.

Purpose of the Study:

• To investigate the role of inhibitory control in chimpanzee performance on a spatial foraging task.
• To differentiate the contribution of inhibitory control from learning and object knowledge in task performance.

Main Methods:

• Chimpanzees completed a spatial foraging task involving learning which objects (cups) contained food.
• Experiment 1: Assessed learning rates with transparent cups containing visible food versus a color discrimination task.
• Experiment 2: Used food cues to signal reward presence or absence, testing congruent and incongruent conditions.

Main Results:

• Chimpanzees learned to avoid cups with visible food faster than a color discrimination.
• Learning was faster when incorrect cups were sealed, preventing food access.
• Chimpanzees learned faster in congruent conditions where food cues accurately predicted rewards.

Conclusions:

• Performance in inhibition tasks is influenced by multiple cognitive abilities, including learning and object knowledge.
• Future comparative research must quantify these cognitive factors to accurately assess inhibitory control.