Dissociation between frontal and temporal-parietal contributions to connected speech in acute stroke

Brain : a Journal of Neurology
Junhua DingTatiana T. Schnur

Abstract

Humans are uniquely able to retrieve and combine words into syntactic structure to produce connected speech. Previous identification of focal brain regions necessary for production focused primarily on associations with the content produced by speakers with chronic stroke, where function may have shifted to other regions after reorganization occurred. Here, we relate patterns of brain damage with deficits to the content and structure of spontaneous connected speech in 52 speakers during the acute stage of a left hemisphere stroke. Multivariate lesion behaviour mapping demonstrated that damage to temporal-parietal regions impacted the ability to retrieve words and produce them within increasingly complex combinations. Damage primarily to inferior frontal cortex affected the production of syntactically accurate structure. In contrast to previous work, functional-anatomical dissociations did not depend on lesion size likely because acute lesions were smaller than typically found in chronic stroke. These results are consistent with predictions from theoretical models based primarily on evidence from language comprehension and highlight the importance of investigating individual differences in brain-language relationships in speaker...Continue Reading

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Citations

Sep 15, 2020·The Clinical Neuropsychologist·Johémie BoucherSimona M Brambati
Feb 1, 2021·Brain : a Journal of Neurology·Andrea Gajardo-VidalCathy J Price
Mar 31, 2021·Journal of Speech, Language, and Hearing Research : JSLHR·Davida FrommTatiana T Schnur
Apr 20, 2021·Cerebral Cortex Communications·Randi C MartinTatiana T Schnur

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