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Spatial frequency and global-local visual processing in capuchin monkeys (Sapajus spp.) and humans (Homo sapiens)
Milena Palumbo1, Giovanna Spinozzi2, Valentina Truppa2
1School of Psychology and Vision Sciences, University of Leicester.
Journal of Comparative Psychology (Washington, D.C. : 1983)
|March 17, 2023
Summary
Capuchin monkeys and humans exhibit distinct visual processing of spatial frequencies, with monkeys favoring high frequencies and humans favoring medium/low. This difference influences global-local visual processing, suggesting species-specific attentional modulation.
Area of Science:
- Comparative psychology
- Visual neuroscience
- Animal cognition
Background:
- Global-local visual processing is a fundamental aspect of perception.
- Understanding species-specific differences in visual processing, particularly spatial frequency sensitivity, is crucial for comparative cognition.
- Previous research has not fully elucidated the factors modulating global-local processing in non-human primates.
Purpose of the Study:
- To compare the spatial frequency discrimination abilities of capuchin monkeys and humans.
- To investigate whether attentional biases towards specific spatial frequencies modulate global-local visual processing in both species.
- To explore potential top-down or selection-history influences on visual processing in capuchins and humans.
Main Methods:
- Two experiments using an identity matching-to-sample procedure.
- Experiment 1: Assessed discrimination of high, medium, and low spatial frequencies (HSFs, MSFs, LSFs).
- Experiment 2: Introduced a procedure to bias attention towards specific spatial frequencies to examine modulation of global-local processing.
Main Results:
- Capuchin monkeys showed better discrimination of HSFs, while humans excelled at MSFs and LSFs.
- Spatial frequency processing influenced global-local processing in both species, but only in local trials.
- This modulation occurred under different conditions: following HSF bias in monkeys and LSF bias in humans.
Conclusions:
- Humans and capuchin monkeys possess distinct sensitivities to different spatial frequencies.
- Global-local visual processing can be modulated by attentional biases towards specific spatial frequencies in both species.
- These findings suggest that visual processing modulation in primates is not solely limited to attending to global or local stimulus features.
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