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Related Experiment Video

Updated: Mar 2, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Does spatial attention modulate the earliest component of the visual evoked potential?

Hannah M Baumgartner1, Christian J Graulty2, Steven A Hillyard3

  • 1a Department of Psychology , University of Michigan , Ann Arbor , MI , USA.

Cognitive Neuroscience
|May 24, 2017
PubMed
Summary

This study investigated if visual spatial attention affects early visual processing in the brain. Researchers found no evidence that attention modulates the initial C1 component, but did observe effects on the later P1 component.

Keywords:
C1ERPP1Visual spatial attention

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The role of visual spatial attention in modulating early visual processing, particularly in the primary visual cortex (V1), remains a subject of debate.
  • A key hypothesis suggests attention influences V1 processing only at later, feedback-mediated latencies, not during initial feedforward input.
  • Previous event-related potential (ERP) studies have presented conflicting evidence, with some suggesting early modulation of the C1 component.

Purpose of the Study:

  • To investigate whether visual spatial attention modulates the earliest visual evoked component, C1, in human primary visual cortex (V1).
  • To replicate and test the findings of Kelly et al. regarding C1 modulation by attention using identical methodological procedures.
  • To examine attentional modulation across all visual field quadrants for the C1 component.

Main Methods:

  • Employed event-related potential (ERP) recordings with subject-specific stimulus locations and electrode placements.
  • Utilized the same experimental design and analysis strategies as the Kelly et al. study.
  • Tested for attentional modulation of the C1 component (50-80 ms) and the subsequent P1 component (90-140 ms) across all visual field quadrants.

Main Results:

  • No statistically significant evidence for attention-based amplitude enhancement of the C1 component was found.
  • Clear and robust attention-based amplitude enhancements were observed for the later P1 component.
  • The findings did not replicate the previously reported C1 attention effects despite using the same methods.

Conclusions:

  • The current study provides no confirmatory evidence for attention-based modulation of the earliest visual evoked component (C1) in primary visual cortex.
  • Attentional modulation of visual processing appears to primarily affect later components, such as the P1, rather than the initial feedforward volley.
  • The results challenge the notion that visual spatial attention can influence processing at the very earliest stages of visual cortical input.