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Translating working memory into action: behavioral and neural evidence for using motor representations in encoding

Robert Langner1, Melanie A Sternkopf, Tanja S Kellermann

  • 1Institute of Neuroscience and Medicine (INM-1), Research Centre Jülich, Jülich, Germany; Institute of Clinical Neuroscience and Medical Psychology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

Human Brain Mapping
|November 14, 2013
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Summary

This study reveals how the brain encodes visual sequences for action. It suggests working memory codes information as motor intentions, especially for guiding sequential actions.

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Corsi block tappingaction memorydelayed serial recallfMRIshort-term memoryspatial spanvisuo-spatial working memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The neural basis of action-oriented working memory, particularly for sequential visuo-spatial tasks, remains unclear.
  • Understanding how the brain translates sensory input into planned motor actions is crucial for cognitive models.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the encoding and recall of visuo-spatial sequences for memory-guided actions.
  • To explore how working memory utilizes sensory information for prospective action planning.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity in participants encoding and recalling dot sequences on a schematic hand.
  • Variable delays were introduced between encoding and recall to examine the effects of rehearsal on neural activity.

Main Results:

  • Encoding and recall engaged bilateral prefrontal, premotor, parietal, and basal ganglia regions, with contralateral dominance for hand-specific processing.
  • Longer delays led to less accurate recall but faster initiation, with motor-related regions showing activation differences.
  • Basal ganglia activity during encoding predicted successful recall, suggesting a role in action planning.

Conclusions:

  • Visuo-spatial sequences are encoded as prospective action representations (motor intentions) within working memory, complementing retrospective sensory codes.
  • This supports multi-component working memory models, emphasizing the adaptive coding of sensory information based on task demands.