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Surface representation in the visual system

H Komatsu1, I Murakami, M Kinoshita

  • 1Laboratory of Neural Control, National Institute for Physiological Sciences, Aichi, Japan.

Brain Research. Cognitive Brain Research
|December 1, 1996
PubMed
Summary
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The visual system can perceive entire surfaces by interpolating information, even at the blind spot. Neurons in the primary visual cortex (V1) activate across the entire surface representation, not just its borders.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • The visual system perceives surfaces as occupying areas with specific qualities like color or brightness.
  • Information about surface quality is often interpolated, especially for homogeneous surfaces, as seen in blind spot filling-in.

Purpose of the Study:

  • To investigate the neural representation of perceived surfaces in the primary visual cortex (V1).
  • To determine if V1 neurons activate across the entire surface area or only at its borders during perception.

Main Methods:

  • Experiments were conducted using macaque monkeys.
  • Neuronal responses in V1 were examined when presented with homogeneous surfaces covering the receptive field.
  • Neuronal activity was also assessed in the V1 representation of the blind spot during perceptual filling-in.

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Main Results:

  • Approximately one-third of tested V1 neurons responded to homogeneous surfaces within their receptive fields.
  • Some V1 neurons were activated by stimuli that induced perceptual filling-in within the blind spot.
  • Neuronal activation was observed throughout the V1 region corresponding to the perceived surface, not solely at its edges.

Conclusions:

  • Perceived surface areas activate neurons throughout their corresponding topographic representation in V1.
  • The neural representation of surfaces extends beyond the immediate border, encompassing the entire perceived area, including interpolated regions like the blind spot.