Cited by 299Neurobiology of Language and BilingualismHemispheric Asymmetry in NeuroscienceStroke Rehabilitation and Recovery

Cortical Language Activation in Stroke Patients Recovering From Aphasia With Functional MRI

Cao, Yue, Vikingstad, Eric M., George, K. Paige, Johnson, Alex F., Welch, K. M. A.·1999·Stroke

Abstract

Background and Purpose —Two mechanisms for recovery from aphasia, repair of damaged language networks and activation of compensatory areas, have been proposed. In this study, we investigated whether both mechanisms or one instead of the other take place in the brain of recovered aphasic patients . Methods —Using blood oxygenation level–dependent functional MRI (fMRI), we studied cortical language networks during lexical-semantic processing tasks in 7 right-handed aphasic patients at least 5 months after the onset of left-hemisphere stroke and had regained substantial language functions since then. Results —We found that in the recovered aphasic patient group, functional language activity significantly increased in the right hemisphere and nonsignificantly decreased in the left hemisphere compared with that in the normal group. Bilateral language networks resulted from partial restitution of damaged functions in the left hemisphere and activation of compensated (or recruited) areas in the right hemisphere. Failure to restore any language function in the left hemisphere led to predominantly right hemispheric networks in some individuals. However, better language recovery, at least for lexical-semantic processing, was observed in individuals who had bilateral rather than right hemisphere–predominant networks. Conclusions —The results indicate that the restoration of left-hemisphere language networks is associated with better recovery and inversely related to activity in the compensated or recruited areas of the right hemisphere.

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Crossref · 10.1161/01.str.30.11.2331

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  • Previous research on recovery of function after brain injury has shown that, in the face of left hemisphere damage, the right hemisphere can increase its activity in a compensatory manner.

    “Previous research on recovery of function after brain injury has shown that, in the face of left hemisphere damage, the right hemisphere can increase its activity in a compensatory manner (16–18).”
  • The results are consistent with studies of recovery of function after left hemisphere damage showing increased activity in right hemisphere homologues of left hemisphere language areas associated with improved language ability.

    “These results are consistent with studies of recovery of function after left hemisphere damage that have shown increased activity in right hemisphere homologues of left hemisphere language areas associated with improved language ability (16–18).”

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Research works printed but not linked: 3

  1. Kinsbourne M. The minor hemisphere as a source of aphasic speech. Arch Neurol. 1971;25:302-306.
  2. Helm-Estabrooks N. Aphasia Diagnostic Profiles. San Antonio, Tex: Special Press; 1991.
  3. Petersen E, Fox PT, Posner M, Mintun M, Raichle M. PET studies of the cortical anatomy of single word processing. Nature. 1988;331:585-589.

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Authors
Cao, Y., Vikingstad, E. M., George, K. P., Johnson, A. F., & Welch, K. M. A.
Affiliations
Henry Ford Health (US)
Venue
Stroke
Published
1999-11
Volume
30
Issue
11
Pages
2331-2340
ISSN
  • 0039-2499 (ISSN-L)
  • 1524-4628
OpenAlex
W2169731332
Cited by
299
References
35
Citations by year
2026: 5 · 2025: 3 · 2024: 2 · 2023: 7 · 2022: 6 · 2021: 3 · 2020: 9 · 2019: 8 · 2018: 2 · 2017: 10 · 2016: 10 · 2015: 11 · 2014: 16 · 2013: 11 · 2012: 21
FWCI
5.93
Type
journal article
Language
en
Open access
closed
Locations
  • Stroke (publishedVersion)
  • PubMed (publishedVersion)
Funders
American Heart Association
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Hemispheric Asymmetry in Neuroscience
  • Health Sciences › Medicine › Rehabilitation › Stroke Rehabilitation and Recovery
Keywords
aphasia recovery, right hemisphere activation, compensatory recruitment, lexical-semantic processing, hemispheric lateralization, functional recovery
MeSH terms
Adult, Aphasia, Cerebral Cortex, Female, Follow-Up Studies, Frontal Lobe, Humans, Image Processing, Computer-Assisted, Language, Language Tests, Functional Laterality, Magnetic Resonance Imaging, Male, Middle Aged, Neural Pathways, Oxygen, Oxygen Consumption, Parietal Lobe, Recruitment, Neurophysiological, Temporal Lobe, Recovery of Function, Stroke

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