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Center-Surround Inhibition in Working Memory.

Anastasia Kiyonaga1, Tobias Egner1

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Summary
This summary is machine-generated.

Maintaining information in working memory (WM) creates an inhibitory surround, similar to visual attention. This mechanism prevents interference from similar, irrelevant stimuli, improving WM performance.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Working Memory Research

Background:

  • Visual attention exhibits an "inhibitory surround" that suppresses nearby stimuli, akin to retinal receptive fields.
  • This mechanism enhances discrimination between relevant and irrelevant environmental information.

Purpose of the Study:

  • To investigate if maintaining information in working memory (WM) also generates an inhibitory surround effect.
  • To determine if this internal inhibitory surround impacts the processing of similar, task-irrelevant stimuli.
  • To explore the relationship between this inhibition and working memory performance.

Main Methods:

  • Experiment 1: Participants maintained a color stimulus in WM and their attention was subsequently drawn to external stimuli that varied in color similarity.
  • Experiment 2: Assessed inhibition between two similar items simultaneously held in WM.
  • Measured behavioral responses to probe stimuli to infer attentional biases and inhibitory effects.

Main Results:

  • Internal WM maintenance produced an inhibitory effect on nearby stimuli in color space, mirroring external attention.
  • This inhibition was observed for stimuli similar to the WM content but not for dissimilar stimuli.
  • WM performance correlated positively with the strength of the observed inhibition.
  • Inhibition was also found between simultaneously maintained similar items in WM.

Conclusions:

  • Working memory maintenance involves a center-surround mechanism with an excitatory focus and an inhibitory surround.
  • This internal inhibitory zone limits interference from confusable representations, optimizing WM function.
  • The findings reveal that the same selection mechanism operates for both external visual attention and internal WM maintenance.