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Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control
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Attention-dependent early cortical suppression contributes to crowding.

Juan Chen1, Yingchen He1, Ziyun Zhu1

  • 1Department of Psychology and Key Laboratory of Machine Perception (Ministry of Education).

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 8, 2014
PubMed
Summary

Crowding, a visual processing challenge, is linked to early brain suppression in V1. Spatial attention modulates this suppression, revealing its role in object recognition.

Keywords:
attentioncrowdingevent-related potentialfMRIprimary visual cortex

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Crowding, the difficulty in identifying targets with nearby flankers, impairs object recognition and visual awareness.
  • The underlying neural mechanisms of crowding remain largely unknown.
  • Understanding crowding is crucial for comprehending visual processing limitations.

Purpose of the Study:

  • To investigate the neural basis of crowding by examining cortical interactions.
  • To determine the specific brain regions and processes involved in crowding.
  • To elucidate the role of spatial attention in the neural mechanisms of crowding.

Main Methods:

  • Event-related potential (ERP) and functional magnetic resonance imaging (fMRI) experiments were conducted.
  • Cortical interactions between targets and flankers were measured in human subjects.
  • The earliest event-related potential component (C1) and BOLD signals in V1 were analyzed.

Main Results:

  • The magnitude of the crowding effect correlated with early cortical suppression.
  • This suppression was observed in the C1 component originating in V1 and in the V1 BOLD signal.
  • Suppression was not found in higher cortical areas, and spatial attention critically influenced its manifestation.

Conclusions:

  • Attention-dependent V1 suppression is a key neural mechanism contributing to crowding.
  • Crowding arises from an early stage of visual processing in V1.
  • These findings offer direct evidence for the role of early visual cortex in crowding.