Go when you know: Chimpanzees' confidence movements reflect their responses in a computerized memory task

Area of Science:

• Cognitive Ethology
• Animal Cognition
• Primate Behavior

Background:

• Metacognition, the ability to monitor one's own cognitive states, is crucial for adaptive behavior.
• While extensively studied in humans, evidence for metacognition in non-human animals, particularly primates, remains an active area of research.
• Understanding metacognitive capabilities in chimpanzees can provide insights into the evolutionary origins of self-awareness.

Purpose of the Study:

• To investigate whether chimpanzees possess spontaneous metacognitive abilities.
• To determine if chimpanzees can monitor the accuracy of their own memory performance.
• To examine if chimpanzees adjust their behavior based on their confidence in their responses.

Main Methods:

• Three chimpanzees participated in a computerized delayed-reward memory task.
• Auditory feedback and food rewards were delayed and delivered in a separate location.
• Chimpanzees had to move to a reward dispenser before food was dispensed to receive it, with rewards lost if not collected promptly.

Main Results:

• Chimpanzees were significantly more likely to move to the reward dispenser following correct responses compared to incorrect ones.
• These anticipatory movements occurred before any external feedback about the trial's outcome was provided.
• The chimpanzees' movements closely aligned with their objective performance accuracy, indicating confidence-based decisions.

Conclusions:

• Chimpanzees exhibit spontaneous metacognitive judgments, demonstrating an ability to monitor their internal states of knowing.
• These findings suggest that chimpanzees can assess the confidence of their memory-based responses and adjust their behavior accordingly.
• The study provides compelling evidence for self-monitoring and adaptive behavioral adjustments in chimpanzees, contributing to our understanding of primate cognition.