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Related Experiment Video

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Phasic modulation of visual representations during sustained attention.

Mats W J van Es1,2, Tom R Marshall1,2, Eelke Spaak1

  • 1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Nijmegen, The Netherlands.

The European Journal of Neuroscience
|December 15, 2020
PubMed
Summary
This summary is machine-generated.

Sustained attention influences perception rhythmically, not continuously. Brain activity in specific attention networks, not visual cortex, modulates this effect, suggesting top-down attentional sampling.

Keywords:
MEGbrain oscillationdecodingfrontoparietal attention networkperceptual cycles

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Visual Perception

Background:

  • Sustained attention traditionally viewed as continuous.
  • Emerging evidence suggests attention operates discretely and rhythmically.
  • Oscillatory brain activity (theta/alpha frequencies) linked to attentional sampling.

Purpose of the Study:

  • Investigate if discrete attentional sampling is reflected in visual stimulus decodability from brain signals.
  • Examine periodic fluctuations in decoding visual orientation based on brain activity phase.
  • Determine the role of frontoparietal networks in attention-modulated perception.

Main Methods:

  • Magnetoencephalography (MEG) recorded from human subjects attending to visual stimuli.
  • Support Vector Machine (SVM) used to decode stimulus orientation (clockwise/counterclockwise) from MEG signals.
  • Analysis of whether decoder performance depended on theta/alpha phase in specific brain regions.

Main Results:

  • Decoding performance of visual stimulus orientation was modulated by theta/alpha phase.
  • Modulation was observed in frontal eye fields and parietal cortex, contralateral to the attended stimulus.
  • No modulation of decoding performance was found based on visual cortex activity phase.

Conclusions:

  • Phasic modulations in visual stimulus representation are driven by frequency-specific top-down activity in the frontoparietal attention network.
  • Suggests a rhythmic, top-down mechanism for attentional sampling in visual processing.
  • Behavioral relevance of these observed neural effects remains to be established.