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Gordon Dodwell1, Rebecca Nako1, Martin Eimer1

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Spatial expectations filter feature-based attention during visual search preparation. Even when preparing for a search, attention to features is modulated by where you expect to find the target.

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Attentional TemplatesAttentional controlEEGEvent-Related Potentials (ERP)N2pc componentSelectionSpatialVisual AttentionVisual Search

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Electrophysiology

Background:

  • Visual search relies on both feature-selective and space-based attention.
  • Feature-based attention is typically considered spatially global but can be location-restricted.
  • Investigating spatial filtering during attentional template activation is crucial.

Purpose of the Study:

  • To determine if spatial filtering affects feature-based attentional templates during search preparation.
  • To examine how spatial expectations modulate attentional allocation before a visual search task.

Main Methods:

  • Measured N2pc components (electrophysiological index of attention) during search preparation.
  • Presented lateral, task-irrelevant, color probes matching target features.
  • Manipulated probe location relevance (task-relevant vs. irrelevant spatial regions).

Main Results:

  • N2pc components to target-color probes were delayed and attenuated at irrelevant locations.
  • Preparatory feature-based attention effects were modulated by spatial expectations.
  • Spatial filtering attenuated but did not eliminate feature-based attentional modulation.

Conclusions:

  • Spatial expectations influence preparatory feature-based attentional templates.
  • Attentional templates are not purely global but can be spatially filtered.
  • This spatial filtering mechanism operates during the preparation phase of visual search.