Impact of aging on frontostriatal reward processing.

Area of Science:

• Neuroscience
• Cognitive Aging
• Neuroimaging

Background:

• Healthy aging involves cognitive decline, potentially linked to impaired stimulus-reward processing.
• Previous studies compared young vs. old, but this research examines aging across a continuous adult lifespan.

Purpose of the Study:

• To investigate the impact of aging on brain activation during reward anticipation and receipt.
• To identify age-related changes in neural responses within the reward system.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 49 healthy adults aged 40-70 years.
• A simple reward task differentiated neural responses to reward anticipation and receipt.
• Performance metrics (accuracy, speed) were analyzed for age-related effects.

Main Results:

• A significant age-related decline in ventral striatum activation during reward anticipation was observed.
• Ventral striatum activation increased with age during reward receipt.
• Ventromedial prefrontal cortex activation during outcome receipt was not age-dependent.

Conclusions:

• The typical shift in striatal activation from receipt to anticipation seen in young adults diminishes with healthy aging.
• These findings align with age-related declines in striatal dopamine availability.
• This research provides insights into age-related cognitive changes and potential neurodegenerative disease pathways.