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Gating by induced Α-Γ asynchrony in selective attention.

David Pascucci1, Alexis Hervais-Adelman2,3, Gijs Plomp1,4

  • 1Perceptual Networks Group, Department of Psychology, University of Fribourg, Fribourg, Switzerland.

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|May 26, 2018
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Summary

Selective attention uses brain signals to focus on relevant information. This study shows parietal cortex disrupts brain wave coupling to ignore irrelevant visual stimuli, preventing task-irrelevant information propagation.

Keywords:
EEGEEG source imagingGranger causalityconnectivityfMRIpartial directed coherencephase amplitude couplingselective attention

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Computational Neuroscience

Background:

  • Visual selective attention involves top-down control, modulating neural activity via alpha-band oscillations.
  • The precise impact of these top-down signals on local processing in primary visual cortex (V1) is not fully understood.

Purpose of the Study:

  • To investigate the interaction between large-scale neural communication and local activity changes in V1 during selective attention.
  • To elucidate the mechanisms by which top-down control influences information processing in the visual cortex.

Main Methods:

  • Utilized electroencephalography (EEG) source signal analysis.
  • Employed Granger-causality and phase-amplitude coupling (PAC) to analyze directed connectivity and cross-frequency interactions.
  • Participants performed a task requiring attending to or ignoring visual stimuli (oriented gratings).

Main Results:

  • Directed connectivity analysis revealed frequency-specific attentional effects: increased bottom-up gamma-band influences for attended stimuli and top-down alpha-band influences from parietal cortex for ignored stimuli.
  • Demonstrated a crucial interaction where parietal alpha-band signals disrupted alpha-gamma PAC in visual areas.
  • This disruption led to reduced gamma-band outflow from visual cortex, indicating suppressed processing of ignored stimuli.

Conclusions:

  • Parietal cortex actively suppresses task-irrelevant information by disrupting neural oscillations (cross-frequency coupling) in target visual areas.
  • This mechanism prevents the propagation of unwanted sensory information, highlighting a novel role for directed interactions in attentional control.
  • Provides the first evidence for how directed interactions modulate cross-frequency coupling in downstream regions based on task demands.