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Gaze-dependent topography in human posterior parietal cortex
Jason D Connolly1, Quoc C Vuong2, Alexander Thiele2
1Faculty of Medical Sciences, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE2 4HH, UK Current address: Wolfson Research Institute, University of Durham, Thornaby TS17 6BH, UK Current address: Department of Psychology, Durham University Science Site, Durham DH1 3LE, UK.
Cerebral Cortex (New York, N.Y. : 1991)
|December 20, 2013
Summary
The posterior parietal cortex (PPC) uses head-/body-centered coordinates, not eye-centered ones, to represent visual space. This brain region reorganizes spatial maps based on gaze direction, influencing effector control.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Computational Neuroscience
Background:
- The brain transforms visual information from retinal coordinates to effector-centered frames.
- The posterior parietal cortex (PPC) is a key area involved in this spatial transformation.
- Debate exists whether PPC uses retinal/eye-centered or head-/body-centered representations.
Purpose of the Study:
- To investigate the coordinate system used by the PPC for spatial representation.
- To differentiate between retinal/eye-centered and head-/body-centered models of PPC function.
- To determine how gaze direction influences spatial mapping in the parietal cortex.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to map brain activity.
- Subjects performed memory-guided saccades with varying starting gaze positions (left, central, right).
- Saccadotopic maps in the PPC were analyzed for spatial reorganization relative to gaze shifts.
Main Results:
- Parietal cortex maps showed significant spatial reorganization with subtle changes in starting gaze position.
- This reorganization occurred despite constant retinal input and eye movement parameters.
- The observed shifts were inconsistent with a purely retinal/eye-centered coordinate system.
Conclusions:
- The PPC primarily utilizes head-/body-centered coordinate systems for spatial representation.
- Findings support models where parietal cortex integrates visual and motor information for effector-directed actions.
- The brain dynamically adjusts spatial representations based on gaze and body orientation.
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