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Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
Published on: December 12, 2012
Iso-orientation domains in cat visual cortex are arranged in pinwheel-like patterns
1Rockefeller University, Laboratory of Neurobiology, New York, New York 10021.
Nature
|October 3, 1991
Summary
Researchers mapped visual cortex orientation maps using optical imaging. They discovered highly ordered patches, not bands, organized around centers, revealing pinwheel-like patterns crucial for visual processing.
Area of Science:
- Neuroscience
- Visual Cortex Organization
- Cortical Mapping
Background:
- Mammalian cortex exhibits columnar organization and surface clustering of neurons with similar functional properties.
- Orientation maps in the visual cortex, depicting gradual changes in orientation preference, have been difficult to precisely map due to technical challenges.
Purpose of the Study:
- To precisely determine the layout of iso-orientation domains in the cat's visual cortex.
- To overcome technical limitations hindering the accurate depiction of orientation maps.
Main Methods:
- Utilized in vivo optical imaging based on intrinsic signals.
- Acquired comprehensive response data to gratings of multiple orientations from a cortical area.
Main Results:
- Identified highly ordered iso-orientation patches, contrasting with previously proposed elongated bands.
- Revealed that these patches are organized around 'orientation centers,' forming pinwheel-like patterns with continuous orientation changes.
- Found that rapid changes in orientation preference ('fractures') are localized exclusively at these orientation centers.
Conclusions:
- The structure of orientation maps in area 18 of the cat is characterized by ordered patches and pinwheel centers.
- These pinwheel centers and their associated fractures represent significant organizational features.
- Understanding the development and function of pinwheels and orientation centers is critical for visual information processing.
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