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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

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Pinwheel-dipole configuration in cat early visual cortex.

Jérôme Ribot¹, Alberto Romagnoni¹, Chantal Milleret²

¹Mathematical Neuroscience Team, CIRB - Collège de France (CNRS UMR 7241, INSERM U1050, UPMC ED 158, MEMOLIFE PSL), 11 Place Marcelin Berthelot, 75005 Paris, France.

|December 29, 2015

Summary

Spatial frequency maps in cat visual cortex organize like electric dipoles around pinwheel centers. This discovery reveals a fundamental organization principle for visual processing in the brain.

Keywords:

Cortical maps Dipole Orientation Singularities Spatial frequency

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Area of Science:

Neuroscience
Computational Neuroscience
Visual System Research

Background:

Functional maps in the early visual cortex are crucial for visual perception.
The precise organization and interrelationships of these maps remain incompletely understood.

Purpose of the Study:

To investigate the spatial organization of spatial frequency representation in the cat's early visual cortex.
To determine the relationship between spatial frequency map singularities and orientation map singularities (pinwheel centers).

Main Methods:

High-resolution intrinsic optical imaging was employed in cat visual areas 17 and 18.
Analysis focused on the spatial frequency and orientation maps derived from imaging data.

Main Results:

Spatial frequency maps exhibit singularities organized like electric dipole potentials.
These spatial frequency singularities are co-located with orientation map pinwheel centers.
A majority of pinwheel centers showed both local maxima and minima in spatial frequency, contradicting previous models.

Conclusions:

Orientation pinwheel centers in the cat visual cortex form spatial frequency dipoles.
This dipolar organization around pinwheel centers may be fundamental to visual processing due to the unique properties of neurons at these singularities.