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Related Experiment Video

Updated: Jun 21, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Population coding for figure-ground texture segregation in macaque V1 and V4.

Xing-Nan Zhao1, Xing-Si Dong1, Dan-Qing Jiang1

  • 1School of Psychological and Cognitive Sciences, Peking University, Beijing, China; PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China.

Progress in Neurobiology
|July 5, 2024
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Summary

V1 neurons primarily detect texture borders, while V4 neurons perform figure-ground segregation. However, V1 neurons also contribute to segregation, especially when population activity is analyzed, revealing their role in defining figure borders.

Keywords:
Figure-ground perceptionMacaqueTexture segregationTwo-photon imagingV1/V4

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • Object recognition relies on segregating figures from backgrounds.
  • Previous studies on V1 and V4 neurons in figure-ground texture segregation yielded conflicting results.
  • The precise role of V1 neurons (border detection vs. segregation) remains debated.

Purpose of the Study:

  • To investigate the population-level roles of V1 and V4 neurons in figure-ground texture segregation.
  • To differentiate between border detection and segregation capabilities of V1 neurons.
  • To understand how information is processed across V1 and V4 for visual segregation.

Main Methods:

  • Two-photon calcium imaging in awake, fixating macaques.
  • Simultaneous recording of large neuronal populations in V1 and V4.
  • Analysis of neuronal responses to figure-ground texture stimuli.
  • Support Vector Machine (SVM) decoding of population activity (PCA-transformed).

Main Results:

  • V1 neurons predominantly signal texture borders, while V4 neurons are more involved in segregation.
  • Population decoding reveals V1 neurons contribute to segregation, but require more components than V4.
  • Individual neuron contributions correlate with response differences, with V1's significance emerging in population analysis.

Conclusions:

  • V1 neurons primarily contribute to figure-ground segregation by defining figure borders.
  • V4 neurons utilize the less structured information from V1 to achieve robust figure-ground segregation.
  • This suggests a hierarchical processing stream for visual texture segregation from V1 to V4.