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Working Memory Capacities Neurally Dissociate: Evidence from Acute Stroke.

Randi C Martin1, Junhua Ding2, A Cris Hamilton3

  • 1Department of Psychological Sciences, Rice University, Houston, TX 77251, USA.

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|April 19, 2021
PubMed
Summary
This summary is machine-generated.

This study used lesion-symptom mapping to identify brain regions supporting phonological and semantic working memory (WM). Findings reveal distinct neural systems for maintaining sound-based versus meaning-based information in acute stroke patients.

Keywords:
acute strokemultivariate lesion-symptom mappingphonological working memorysemantic working memorysupport vector regression

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Behavioral studies suggest distinct working memory (WM) components for phonological and semantic information.
  • Few neuroimaging studies have investigated the neural basis of these separable WM components.
  • No lesion-symptom mapping (LSM) studies have explored the neural correlates of phonological versus semantic WM.

Purpose of the Study:

  • To investigate the neural basis of phonological and semantic working memory using a multivariate lesion-symptom mapping (LSM) approach.
  • To identify brain regions critical for maintaining phonological information in WM.
  • To identify brain regions critical for maintaining semantic information in WM.

Main Methods:

  • A multivariate lesion-symptom mapping (LSM) study was conducted on 94 individuals with acute left hemisphere stroke.
  • Participants were tested during the acute stage of stroke to avoid brain reorganization and patient strategy adaptation.
  • LSM analyses controlled for the other WM component and for single-word semantic and phonological knowledge.

Main Results:

  • For phonological working memory, key regions identified included the supramarginal gyrus and areas associated with inner rehearsal.
  • For semantic working memory, the inferior frontal regions and the angular gyrus were implicated.
  • These findings demonstrate separable neural systems for phonological and semantic WM.

Conclusions:

  • The study provides converging evidence for distinct neural systems supporting phonological and semantic working memory.
  • These WM systems are differentiated from neural systems supporting long-term knowledge representation.
  • The findings highlight the neural dissociation between maintaining sound-based and meaning-based information in working memory.