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Distractor suppression does and does not depend on pre-distractor alpha-band activity.

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    Strategic use of spatial cues speeds distractor suppression, enhancing target detection. Foreknowledge of distractor location facilitates suppression independently of alpha-band activity, highlighting pre-stimulus neural processes.

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    Area of Science:

    • Cognitive Neuroscience
    • Neuroscience
    • Psychology

    Background:

    • Selective attention involves enhancing important information and suppressing distractors.
    • Research has focused more on sensory enhancement than suppression.
    • Debate exists on whether suppression can occur independently of enhancement and before distractor onset.

    Approach:

    • Utilized electroencephalography (EEG) and behavioral measures during a visual search task.
    • Investigated alpha power (∼8-15 Hz) and distractor positivity (P$_{D}$) as markers of suppression.
    • Examined the effects of spatial cues indicating upcoming distractor locations.

    Key Points:

    • Cueing distractor locations sped up responses and led to earlier P$_{D}$ onset, indicating proactive suppression.
    • Higher pre-distractor alpha power correlated with successful suppression, but was not consistently modulated by spatial cues.
    • Cueing effects on behavior and neural measures were independent of alpha-power-related sensory gating.

    Conclusions:

    • Spatial cues enable proactive distractor suppression before distractor appearance.
    • Successful suppression can occur independently of alpha-band activity modulation.
    • Pre-stimulus neural processes are crucial for effective distractor suppression.