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Two distinct modes of sensory processing observed in monkey primary visual cortex (V1).

H Supèr1, H Spekreijse, V A Lamme

  • 1Graduate School of Neurosciences, Department of Visual System Analysis, AMC, University of Amsterdam, PO Box 12011, 1100 AA Amsterdam, The Netherlands.

Nature Neuroscience
|February 27, 2001
PubMed
Summary

Neural activity in the primary visual cortex is suppressed when stimuli are missed. This suggests recurrent processing plays a key role in visual perception, bridging sensory input and decision-making.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Neuroscience

Background:

  • Sensory stimuli are not always perceived, even when salient.
  • The neural mechanisms underlying missed perceptions remain unclear.
  • Understanding these mechanisms is crucial for comprehending brain function.

Purpose of the Study:

  • To investigate the neural basis of undetected sensory stimuli.
  • To identify specific brain activity components that are suppressed during missed perceptions.
  • To elucidate the role of recurrent processing in visual awareness.

Main Methods:

  • Electrophysiological recordings in the primary visual cortex of monkeys.
  • Analysis of neural activity components occurring after 100 ms.
  • Correlation of neural activity with stimulus detection and non-detection.

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Main Results:

  • A late (> 100-ms) neural activity component in the primary visual cortex was selectively suppressed when stimuli were not perceived.
  • Evidence suggests this suppressed activity relies on feedback from extrastriate areas.
  • The perceptual level was identified as an intermediate stage between sensory processing and decision/motor stages.

Conclusions:

  • Recurrent processing, involving feedback from higher-order areas, is critical for stimuli to reach a perceptual level.
  • Suppression of late neural activity in the primary visual cortex underlies missed perceptions.
  • Visual perception involves a distinct stage situated between sensory input and response execution.