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Higher Mental Functions of the Brain: Language01:10

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
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Related Experiment Video

Updated: Mar 23, 2026

Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Right hemisphere structures predict poststroke speech fluency.

Ethan Pani1, Xin Zheng1, Jasmine Wang1

  • 1From the Department of Neurology, Neuroimaging and Stroke Recovery Laboratory, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA.

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Right hemisphere white matter integrity, particularly in the middle temporal gyrus, precentral gyrus, and inferior frontal gyrus, is linked to speech fluency in chronic aphasia patients. This highlights the role of right-sided brain networks in post-stroke speech recovery.

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Area of Science:

  • Neuroscience
  • Neurology
  • Speech-Language Pathology

Background:

  • Aphasia following left hemisphere stroke often impairs speech fluency.
  • The role of right hemisphere white matter and interhemispheric connectivity in chronic aphasia remains incompletely understood.

Purpose of the Study:

  • To investigate the contribution of right hemisphere white matter integrity and interhemispheric connectivity to speech fluency in individuals with chronic aphasia post-left hemisphere stroke.

Main Methods:

  • Cross-sectional study correlating fractional anisotropy (FA) in specific right hemisphere white matter regions (MTG, PreCG, IFGop, IFGtri) and corpus callosum (CC) with speech fluency measures.
  • Comparison of FA values between patients and healthy controls, including analysis of the left arcuate fasciculus lesion load.

Main Results:

  • FA in the right middle temporal gyrus (MTG), precentral gyrus (PreCG), and pars opercularis of the inferior frontal gyrus (IFGop) significantly predicted speech fluency.
  • A combined model of right hemisphere FA and left arcuate fasciculus lesion load best predicted speech fluency.
  • Corpus callosum (CC) FA, particularly fibers connecting supplementary motor areas (SMA), correlated with speech fluency; patients showed lower CC FA than controls.

Conclusions:

  • Right hemisphere white matter integrity is associated with speech fluency in chronic aphasia.
  • These findings may suggest beneficial premorbid anatomical variability or post-stroke neural reorganization contributing to speech recovery.