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Transformation from a retinal to a cyclopean representation in human visual cortex
Martijn Barendregt1, Ben M Harvey2, Bas Rokers1
1Experimental Psychology, Helmholtz Institute, Utrecht University, 3584 CS Utrecht, the Netherlands; Department of Psychology, University of Wisconsin-Madison, 1202 West Johnson Street, Madison, WI 53706, USA.
Current Biology : CB
|July 7, 2015
Summary
The human brain transforms two separate eye images into a single visual perception. This visual processing shift from retinal to cyclopean representation occurs in extrastriate cortex, not V1.
Area of Science:
- Neuroscience
- Visual Perception
- Human Brain Imaging
Background:
- The human visual system integrates two distinct retinal images into a unified cyclopean view.
- Current understanding suggests retinotopy is maintained throughout the visual cortex.
- A hypothesis proposes a transformation from retinal to cyclopean representation.
Purpose of the Study:
- To identify the specific stage in human visual processing where the retinal-to-cyclopean image transformation occurs.
- To test the hypothesis of a representational shift within the visual cortex.
Main Methods:
- Utilized binocular stimuli to engage both eyes.
- Employed population receptive field mapping (pRF) techniques.
- Conducted ultra-high-field (7 Tesla) functional magnetic resonance imaging (fMRI).
Main Results:
- Striate cortex (V1) responses primarily reflect stimulus position in individual retinal images.
- Extrastriate cortex (V2 to LO) responses better represent stimulus position in the cyclopean image.
- Demonstrated a clear transition point for this representational transformation.
Conclusions:
- Pinpointed extrastriate cortex as the location for the retinal-to-cyclopean representation transformation.
- Provides crucial insights into the sensory-to-perceptual transition in visual processing.
- Advances understanding of how the brain constructs a single visual experience from binocular input.
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