Compensatory Mechanisms in Prefrontal and Reward Systems Reveal Delayed Brain Aging in Musicians

Area of Science:

• Neuroscience
• Cognitive Psychology
• Music Cognition

Background:

• The reward system, crucial for processing rewarding stimuli like music, plays a role in cognitive aging.
• While prefrontal cortex and sensory cortex interactions are studied in aging musicians, the reward system's role is less understood.
• Investigating the reward system's compensatory function in older musicians is vital for understanding cognitive resilience.

Purpose of the Study:

• To determine if the reward system supports compensatory mechanisms in older musicians.
• To explore how music training influences brain activity and cognitive function in aging.
• To compare brain activation patterns between musicians and non-musicians across different age groups.

Main Methods:

• Recruited four groups: younger musicians, older musicians, younger controls, and older controls.
• Collected functional magnetic resonance imaging (fMRI) data during pleasant music listening.
• Employed cross-validated predictive modeling, functional connectivity, and behavioral correlation analyses.

Main Results:

• Amplitude of low-frequency fluctuations predicted musical training duration, linking expertise to brain activity.
• Older musicians showed similar ventral caudate and sensory activation as younger musicians, but reduced prefrontal cortex activity.
• Distinct prefrontal-reward system coupling was observed in musicians compared to controls.

Conclusions:

• Long-term music training may help older musicians maintain reward system activation.
• This sustained reward system activation may compensate for reduced prefrontal activity, easing cognitive load.
• Music training offers a potential compensatory mechanism for preserving cognitive function in aging musicians.