Structural Neuroplasticity Effects of Singing in Chronic Aphasia.

Area of Science:

• Neuroscience
• Neurology
• Speech and Language Therapy

Background:

• Singing-based interventions show promise for improving language outcomes in aphasia.
• The specific neural mechanisms, particularly structural neuroplasticity, underlying group-based singing in post-stroke aphasia remain largely unexplored.

Purpose of the Study:

• To investigate structural neuroplasticity changes in the brain associated with group-based singing interventions in chronic aphasia.
• To determine if these neuroplasticity changes correlate with improvements in language function, specifically naming and repetition.

Main Methods:

• A 4-month randomized controlled trial involving 28 patients with chronic post-stroke aphasia.
• Intervention group received multicomponent singing therapy; control group received standard care.
• Structural neuroimaging (T1-weighted MRI, diffusion-weighted MRI) and behavioral language assessments (Western Aphasia Battery) were conducted at baseline and 5 months.

Main Results:

• The singing group exhibited enhanced white matter connectivity in key language tracts, including the left arcuate fasciculus (AF) and frontal aslant tract (FAT), compared to controls.
• Gray matter volume increased in the left inferior frontal cortex (Brodmann area 44) in the singing group.
• Neuroplasticity in left BA44, AF, and FAT significantly correlated with improvements in naming abilities.

Conclusions:

• Group-based singing interventions can induce significant structural neuroplasticity in left-hemisphere language areas and bilateral language pathways in patients with chronic aphasia.
• These structural brain changes are associated with functional improvements in speech production, particularly naming.
• Singing therapy offers a viable approach for promoting brain recovery and enhancing language function post-stroke.