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Updated: Jun 15, 2026
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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
Facial expression recognition in rhesus monkeys, Macaca mulatta.
1Division of Psychiatry and Behavioral Sciences, and Yerkes National Primate Research Center, Emory University.
Animal Behaviour
|March 16, 2010
Summary
Rhesus monkeys can distinguish between facial expressions, but struggle when distinguishing between different expressions on unfamiliar individuals. Mouth shape and lip movement are key visual cues in facial recognition.
Area of Science:
- Primate ethology
- Animal cognition
- Primate social behavior
Background:
- Facial expression recognition is vital for nonhuman primate social communication.
- Understanding how monkeys discriminate facial expressions is limited.
Purpose of the Study:
- To investigate how rhesus monkeys discriminate between conspecific facial expressions.
- To identify the visual features monkeys use to differentiate expressions.
Main Methods:
- A matching-to-sample task was used with seven rhesus monkeys.
- Monkeys were presented with identical or different facial expression stimuli.
- Multidimensional scaling analysis was employed to analyze error patterns.
Main Results:
- Monkeys performed above chance in discriminating facial expressions.
- Discrimination was impaired when expression types were presented with unfamiliar individuals.
- Mouth shape and lip movement were identified as important, but not sole, discriminative features.
Conclusions:
- Rhesus monkeys utilize specific facial features but do not rely exclusively on them for expression discrimination.
- Social context and individual identity influence facial expression recognition in monkeys.
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