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Representation of eye position in the human parietal cortex
Adrian L Williams1, Andrew T Smith
1Centre for Cognition and Neuroimaging, Brunel University, Uxbridge, UK.
Journal of Neurophysiology
|August 20, 2010
Summary
Researchers found neurons sensitive to eye position in the human brain, even in darkness. This discovery in the posterior parietal cortex helps understand how we distinguish real motion from eye movement-induced retinal motion.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Human Brain Imaging
Background:
- Neurons signaling eye position are crucial for differentiating real-world motion from retinal motion.
- Understanding these neurons in the human brain is limited.
Purpose of the Study:
- To investigate the existence and location of eye position-sensitive neurons in the human brain.
- To identify brain regions involved in encoding gaze direction.
Main Methods:
- Functional magnetic resonance imaging (fMRI) with multivoxel pattern analysis (MVPA).
- Searchlight paradigm to identify localized brain activity.
- Participants maintained specific gaze directions (left or right) in darkness.
- Exclusion of saccade-related activity to focus on tonic eye position.
Main Results:
- Sensitivity to tonic eye position detected in the dorsal precuneus and posterior intraparietal sulcus.
- Eye position sensitivity also observed in anterior occipital cortex.
- These findings were evident even without visual stimulation.
Conclusions:
- Evidence supports the existence of eye position-sensitive neurons in the human posterior parietal cortex.
- These neurons contribute to gaze direction encoding.
- Observed visual cortical sensitivity may stem from feedback mechanisms related to eye position signals.
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