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Selection within working memory based on a color retro-cue modulates alpha oscillations.

Claudia Poch1, Almudena Capilla2, José Antonio Hinojosa1

  • 1Instituto Pluridisciplinar, Universidad Complutense de Madrid, Spain; Departamento de Psicología Básica I, Universidad Complutense de Madrid, Spain.

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Summary

Directing attention to items in working memory (WM) using color cues enhances performance. This study found that color-guided attention to WM representations involves lateralized alpha activity, suggesting a spatial attention mechanism underlies feature-based selection.

Keywords:
Alpha activityRetro-cueWorking memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Working memory (WM) holds flexible mental representations.
  • Selective attention can be directed to WM representations, improving performance.
  • Previous research primarily focused on spatial cues, but non-location features also guide attention.

Purpose of the Study:

  • To investigate the neural oscillations underlying attention directed to WM representations based on a feature (color).
  • To determine if non-spatial feature cues engage spatial attention mechanisms in WM.

Main Methods:

  • Recorded electroencephalography (EEG) from 36 healthy adults performing a WM task.
  • Subjects memorized orientations of colored rectangles.
  • A central color cue indicated the relevant item after a delay.

Main Results:

  • Directing attention to a memory item via color cue modulated posterior alpha activity.
  • Increased contralateral alpha desynchronization was observed, a marker of spatial attention.
  • This lateralized alpha activity suggests a spatial mechanism for feature-based WM selection.

Conclusions:

  • Feature-based attention to working memory representations utilizes spatial attentional mechanisms.
  • Color retro-cues can isolate endogenous attentional effects, avoiding confounds of spatial cues.
  • Findings support a unified spatial mechanism for both external and internal attention in WM.