Acute Stress Enhances Emotional Face Processing in the Aging Brain

Area of Science:

• Neuroscience
• Gerontology
• Psychology

Background:

• Healthy aging typically involves stable emotional well-being and reduced responses to negative stimuli.
• However, depressive symptoms are prevalent in older adults, creating a paradox.
• The neural underpinnings of this paradox, particularly concerning acute stress, require further investigation.

Purpose of the Study:

• To investigate the impact of acute stress on emotion processing in the aging brain.
• To compare brain responses to emotional stimuli between older and younger adults under stress.
• To identify neural mechanisms linking stress, aging, and vulnerability to affective disorders.

Main Methods:

• A randomized, controlled crossover design was employed.
• Functional magnetic resonance imaging (fMRI) was used to assess brain activity.
• Twenty-five older adults (60-75 years) and 25 young adults (18-30 years) participated, undergoing stress and control conditions.

Main Results:

• Stress responses were comparable between age groups.
• A significant age-by-stress interaction was observed in the fusiform gyrus, showing increased activity in older adults only.
• Older adults exhibited stress-related increases in amygdala activity, which correlated with conscientiousness.

Conclusions:

• Healthy older adults display heightened responsivity in emotion-processing brain regions under acute stress compared to younger adults.
• This increased neural reactivity following stress may represent a mechanism for rapid shifts from well-being to vulnerability for affective disorders in aging.
• Findings highlight the role of acute stress in modulating neural circuits crucial for emotion regulation in later life.