Silent and continuous fMRI scanning differentially modulate activation in an auditory language comprehension task

Area of Science:

• Neuroimaging
• Auditory Neuroscience
• Functional Magnetic Resonance Imaging (fMRI)

Background:

• Sparse temporal acquisition schemes in fMRI reduce acoustic scanner noise.
• Clustered-temporal acquisition (CTA) enhances temporal sampling efficiency.
• Investigating neural correlates of human audition requires minimizing confounding noise.

Purpose of the Study:

• To evaluate the combination of event-related task design with CTA in auditory language comprehension.
• To compare functional responses between conventional fMRI acquisition (CA) and silent fMRI (CTA).
• To identify specific brain regions showing differential activation based on the acquisition protocol.

Main Methods:

• Utilized a clustered temporal acquisition (CTA) protocol for "silent" fMRI.
• Employed a conventional fMRI acquisition (CA) protocol with continuous scanner noise.
• Fifteen volunteers performed an auditory language comprehension task under both conditions.

Main Results:

• CTA demonstrated significantly stronger functional responses in the superior temporal plane compared to CA.
• Bilateral insulae showed stronger engagement during CA (continuous scanning).
• Region-of-interest analysis revealed protocol-dependent cortical activation asymmetries in the supratemporal plane.

Conclusions:

• Silent fMRI with CTA is advantageous for exploring auditory and speech functions.
• CTA enhances sensitivity in the superior temporal plane for auditory processing.
• Acquisition protocol influences regional brain activation patterns, particularly in the supratemporal plane.