Other people's gaze encoded as implied motion in the human brain
Arvid Guterstam1, Andrew I Wilterson2, Davis Wachtell2
1Department of Psychology, Princeton University, Princeton, NJ 08544 arvidg@princeton.edu.
Summary
The brain encodes gaze direction as implied motion, particularly in sighted individuals. This process involves the motion-sensitive middle temporal complex (MT+) and temporo-parietal junction (TPJ), crucial for social cognition.
Area of Science:
- Neuroscience
- Social Cognition
- Cognitive Psychology
Background:
- Gaze perception is vital for social cognition, enabling understanding of intentions and beliefs (theory of mind).
- Behavioral studies suggest an implicit model of gaze, potentially including non-physical attributes like 'force-carrying beams'.
Purpose of the Study:
- To investigate if the brain encodes gaze direction as implied motion.
- To determine the neural correlates of gaze perception using functional magnetic resonance imaging (fMRI).
Main Methods:
- Used multivoxel pattern analysis (MVPA) on fMRI data.
- Trained a classifier to detect visual motion direction.
- Presented static images of sighted and blindfolded faces.
Main Results:
- The classifier successfully decoded gaze direction from brain activity in the middle temporal complex (MT+) and temporo-parietal junction (TPJ) for sighted faces.
- Gaze direction decoding was not significant for blindfolded faces.
- Demonstrated a link between the visual motion system (MT+) and social brain regions (TPJ).
Conclusions:
- The brain encodes gaze as implied motion, involving a network of visual motion and social cognition areas.
- The temporo-parietal junction (TPJ) collaborates with the middle temporal complex (MT+) to process gaze direction.
- This implied motion model is a fundamental aspect of social cognition for tracking attention.
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