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Related Experiment Video

Updated: Oct 16, 2025

Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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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.

Brain Sciences
|October 23, 2021
PubMed
Summary

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.