Functional connectivity corresponding to the tonotopic differentiation of the human auditory cortex

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Functional Neuroimaging

Background:

• Resting-state functional connectivity (RS-FC) within the human auditory cortex (HAC) is known to be frequency-selective.
• However, it remains unclear if RS-FC between the HAC and other brain regions exhibits frequency differentiation.

Purpose of the Study:

• To investigate whether resting-state functional connectivity (RS-FC) between the human auditory cortex (HAC) and other brain regions is frequency-selective.
• To map frequency-specific connectivity patterns originating from the HAC.

Main Methods:

• Utilized resting-state and task-based functional magnetic resonance imaging (fMRI) data from 50 participants.
• Defined six regions of interest (ROIs) in the HAC based on responses to pure tone stimuli (200-6,400 Hz) using task-based fMRI.
• Employed these ROIs as seeds to analyze RS-FC with other brain regions.

Main Results:

• Identified significant RS-FC between the HAC and various brain regions, including the superior temporal gyrus, dorsolateral prefrontal cortex (DL-PFC), parietal cortex, occipital lobe, and subcortical structures.
• Observed significant frequency-dependent differences in connectivity strength between HAC ROIs and other brain regions.
• Demonstrated distinct connectivity patterns for low, intermediate, and high frequencies with specific cortical and subcortical areas.

Conclusions:

• Resting-state functional connectivity between the human auditory cortex and other brain areas is frequency-selective.
• These findings reveal frequency-specific large-scale brain networks involved in auditory processing.
• The study highlights the importance of frequency in shaping functional brain organization.