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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Testing a dynamic-field account of interactions between spatial attention and spatial working memory.

Jeffrey S Johnson1,2, John P Spencer3

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Spatial working memory (SWM) performance declines when attention shifts. New research suggests SWM representations drift toward attended locations, rather than failing completely, explaining performance changes.

Keywords:
AttentionAttention: Theoretical and computational modelsSpatial memory

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Memory

Background:

  • Spatial working memory (SWM) is crucial for cognitive tasks.
  • Previous studies linked SWM performance to sustained attention.
  • Attention withdrawal during SWM retention typically impairs memory.

Purpose of the Study:

  • To investigate the effect of shifting attention on spatial working memory.
  • To test a neural-process model predicting representational drift in SWM.
  • To differentiate between memory failure and representational drift explanations.

Main Methods:

  • Participants performed a spatial-recall task with a concurrent color discrimination task during the delay.
  • Attention was shifted towards or away from memorized locations.
  • Spatial recall errors were analyzed for changes in variance and direction.

Main Results:

  • Recall errors showed a directional bias, shifting towards the location of discrimination targets.
  • This bias depended on the direction of the attention shift.
  • Results contradicted the hypothesis of memory failure and supported representational drift.

Conclusions:

  • Shifting attention during SWM retention does not cause memory failure but induces representational drift.
  • SWM representations are dynamically updated and influenced by attentional shifts.
  • Findings support a neural-process model of SWM involving representational drift.