Modulation of the motor cortex during singing-voice perception.

Area of Science:

• Neuroscience
• Auditory Perception
• Motor System Involvement

Background:

• Action observation studies reveal movement's biological aspect influences sensorimotor interactions in perception.
• The role of sound's biological dimension in motor system engagement during auditory perception remains less understood.

Purpose of the Study:

• To investigate if the biological characteristics of sound, specifically vocal music, modulate motor system involvement in auditory perception.
• To explore the neural mechanisms underlying the perception of vocal melodies using functional magnetic resonance imaging (fMRI).

Main Methods:

• fMRI was employed to measure brain activity during musical tasks.
• The vocal motor cortex was localized for each participant.
• Blood-oxygen-level-dependent (BOLD) responses were compared across vocal, semi-vocal, and non-vocal melody perception.
• Psychophysiological interaction analysis was conducted using the right sensorimotor cortex as a seed region.

Main Results:

• Vocal melody perception elicited greater activation in the right sensorimotor cortex compared to semi-vocal and non-vocal stimuli.
• The vocal dimension of stimuli enhanced connectivity between the sensorimotor cortex and auditory dorsal stream nodes.
• A negative correlation was found between vocal ability and the voice effect in the Inferior Parietal Lobule.

Conclusions:

• The biological dimension of singing voices influences activity within the auditory dorsal stream.
• This effect is likely mediated by enhanced matching between perceived auditory stimuli and the listener's motor representations.
• Findings highlight the intricate relationship between auditory perception and the motor system, particularly in response to human voice.