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Simultaneous Normalization and Compensatory Changes in Right Hemisphere Connectivity during Aphasia Therapy.

Tammar Truzman1,2, Elizabeth Rochon3,4, Jed Meltzer3,5,6

  • 1Communication Sciences and Disorders Department and IIPDM, University of Haifa, Haifa 3498838, Israel.

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|October 23, 2021
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Summary
This summary is machine-generated.

This study shows that aphasia (PWA) treatment improves brain connectivity, normalizing some language network functions while also reorganizing others in the right hemisphere (RH) for compensatory purposes.

Keywords:
DCMPEBaphasiaeffective connectivitylanguage networklanguage recoveryspeech therapystroke

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Speech and Language Pathology

Background:

  • Aphasia, a language disorder following stroke, involves disruptions in the brain's language network.
  • Understanding neural reorganization is crucial for effective language therapy in chronic aphasia.

Purpose of the Study:

  • To investigate changes in brain connectivity during language therapy in participants with aphasia (PWA).
  • To explore neural reorganization within the language network, specifically focusing on right hemisphere (RH) involvement.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) with phonological and semantic tasks.
  • Administered two fMRI scans 3.5 months apart, with PWA undergoing Phonological Components Analysis treatment in between.
  • Examined changes in effective connectivity within the RH architecture.

Main Results:

  • Following treatment, PWA showed increased resemblance to healthy controls (HC) in averaged connectivity for object name retrieval.
  • Connectivity enhanced by phonological tasks in PWA decreased resemblance to HC, indicating RH compensatory reorganization.
  • Both normalization and compensation were observed simultaneously in the chronic stage of aphasia.

Conclusions:

  • Language therapy can lead to both normalization and compensatory neural reorganization in the chronic stage of aphasia.
  • The right hemisphere plays a significant role in supporting phonological processing through compensatory mechanisms.
  • Findings highlight the dynamic nature of neural plasticity in response to therapeutic intervention.