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Somatosensory working memory in human reinforcement-based motor learning.

Ananda Sidarta1, Floris T van Vugt1,2, David J Ostry1,2

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Better somatosensory working memory aids reinforcement motor learning. Participants better remembered movements that received positive feedback, suggesting working memory prioritizes rewarded actions.

Keywords:
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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Working memory is crucial for motor learning, especially in reinforcement-based tasks.
  • Previous research explored working memory in visuospatial domains, but its role in somatosensory-guided motor learning is less understood.

Purpose of the Study:

  • To investigate the relationship between somatosensory working memory and motor learning.
  • To determine if working memory preferentially retains information about successful, reinforced movements.

Main Methods:

  • Two experiments were conducted: one with separate memory and motor learning tasks, and another with interleaved trials.
  • Participants performed reaching movements with robotic arm feedback and judged remembered arm displacements.
  • Reinforcement was provided for successful movements towards a hidden target.

Main Results:

  • Individuals with superior somatosensory working memory demonstrated enhanced motor learning.
  • Memory performance was better for successful movements compared to failed ones.
  • Interleaved trials confirmed that working memory for movements was linked to learning outcomes.

Conclusions:

  • Somatosensory working memory plays a significant role in reinforcement motor learning.
  • Working memory is biased towards retaining information about rewarded movements, not all movements equally.
  • This suggests a mechanism where positive feedback strengthens memory encoding for motor actions.