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Functional connectivity changes in the language network during stroke recovery.

Veena A Nair¹, Brittany M Young², Christian La³

¹Department of Radiology, UW-Madison Madison, Wisconsin.

Annals of Clinical and Translational Neurology

|March 10, 2015

Summary

This summary is machine-generated.

Early stroke patients without aphasia show reduced language network connectivity and verbal fluency deficits. These changes persist even months after the stroke, indicating lasting effects on brain function and language performance.

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Area of Science:

Neuroscience
Neurology
Cognitive Science

Background:

Language reorganization after stroke is well-studied in aphasia patients.
Fewer studies investigate language network changes in stroke patients without overt language deficits.
Resting-state functional connectivity (rsFC) and verbal fluency (VF) are key indicators of language function.

Purpose of the Study:

To investigate functional connectivity (FC) changes in the language network of stroke patients without aphasia.
To assess performance on a verbal fluency (VF) task in these patients.
To correlate brain rsFC with behavioral performance.

Main Methods:

Used resting-state fMRI to examine FC in the language network of early-stage ischemic stroke patients (N=26) and healthy controls (HCs).
Assessed VF task performance in early-stage patients, late-stage patients (N=14), and patients at risk (PR, N=12).
Correlated rsFC changes with VF task performance and behavioral changes over time.

Main Results:

Early stroke patients exhibited decreased rsFC in the language network compared to HCs.
Early stroke patients showed impaired VF task performance compared to HCs.
Late-stage patients demonstrated normalized rsFC but persistent behavioral deficits compared to HCs.
Changes in specific connection strengths correlated with behavioral improvements from early to late stages.

Conclusions:

Stroke patients without clinically diagnosed aphasia exhibit decreased language network rsFC and verbal fluency deficits.
These findings highlight subtle but significant language network alterations post-stroke.
The study underscores the utility of rsFC and VF tasks in detecting post-stroke neurological changes.