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Updated: Mar 6, 2026

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Functional Clusters for Shape, Texture, and Motion Encoding in Macaque V2.

Taekjun Kim1, Rohit Kamath2, Gaku Hatanaka2

  • 1Department of Neurobiology & Biophysics and Washington National Biomedical Research Center, University of Washington, Seattle, Washington 98195 taekjun@uw.edu pasupat@u.washington.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 4, 2026
PubMed
Summary
This summary is machine-generated.

Researchers found that macaque visual area V2 has fine-scale functional clusters, similar to columns in V1, which encode complex visual features. This organization differs from higher-level area V4, showing a progression in visual processing.

Keywords:
Neuropixelscortical columnfunctional architectureimage statisticsmonkeyvisual hierarchy

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Area of Science:

  • Neuroscience
  • Visual System Organization
  • Cortical Processing

Background:

  • Macaque primary visual cortex (V1) shows clear columnar organization, while area V4 does not.
  • The functional organization of the intervening area V2 is less understood.
  • Understanding V2 is crucial for mapping the progression of visual information processing.

Purpose of the Study:

  • To investigate the functional organization and representational bases of macaque visual area V2.
  • To compare the organization of V2 with V1 and V4.
  • To understand how neuronal representations transform across visual areas.

Main Methods:

  • High-density Neuropixels recordings in three macaques (one male, two females).
  • Presentation of diverse visual stimuli including shape, texture, drifting gratings, and motion patches.
  • Analysis of neuronal tuning and clustering across V2 layers.

Main Results:

  • Dense clusters of similarly tuned neurons were observed in V2, spanning approximately 500 µm, indicating columnar structure.
  • V2 responses were explained by local image statistics, with shape tuning modeled by orientation filters.
  • Direction selectivity in V2 was stronger for surface motion than object motion, contrasting with V4.

Conclusions:

  • Macaque V2 exhibits fine-scale functional clusters, extending beyond V1's orientation-selective columns.
  • Neuronal representations transition from local feature encoding in V1/V2 to object-based codes in V4.
  • Columnar organization is present in early visual areas (V1, V2) but attenuated in higher areas (V4).