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Heterogeneous Effects of Cognitive Arousal on the Contrast Response in Human Visual Cortex
Jasmine Pan1,2, Louis N Vinke3,4,5, Joseph T McGuire6,2
1Psychological & Brain Sciences, Boston University, Boston, Massachusetts 02215 jasminep@bu.edu samling@bu.edu.
Summary
Cognitive arousal impacts human vision differently across individuals. Some show enhanced visual responses with higher arousal, while others experience decreased responses, linked to pupil size changes.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Animal studies suggest arousal influences visual processing, but human evidence is limited.
- Understanding arousal's effect on human vision is crucial for cognitive neuroscience.
Purpose of the Study:
- To investigate how cognitive arousal modulates visual cortex responses in humans.
- To examine the gain of contrast response functions (CRFs) under varying arousal states.
Main Methods:
- Used fMRI to measure BOLD responses in early visual cortex (V1-V3).
- Participants viewed stimuli with varying contrast while solving auditory arithmetic problems (easy/hard) to induce arousal.
- Measured contrast response functions (CRFs) to assess neural gain.
Main Results:
- Group-level analysis showed minimal modulation of visual responses by cognitive arousal.
- Significant individual variability observed: some showed enhanced neural responses, others decreased responses with increased arousal.
- Arousal-related changes in pupil size correlated with visuocortical modulation, with larger pupil dilation linked to decreased responses.
Conclusions:
- Cognitive arousal has diverse effects on human visual processing, varying substantially between individuals.
- Individual differences in arousal's impact may relate to cognitive effort and non-linear processing.
- Pupil size changes serve as a potential indicator of arousal's modulatory effect on visual cortex activity.
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