When action prediction grows old: An fMRI study.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Action prediction is vital for social interaction.
• Age-related changes in action prediction are understudied, particularly for simple gestures.
• Healthy aging's impact on neurophysiology during action prediction is largely unknown.

Purpose of the Study:

• To investigate age-related differences in predicting simple actions (grasping, pointing) from implied motion.
• To examine the neurophysiological underpinnings using functional magnetic resonance imaging (fMRI).
• To assess the specificity of age effects using a color-discrimination control task.

Main Methods:

• Participants observed implied-motion postures of grasping and pointing actions.
• A color-discrimination task served as a control.
• Functional magnetic resonance imaging (fMRI) measured brain activity.

Main Results:

• Older adults showed reduced performance efficiency, though not specific to action prediction.
• Both groups activated the lateral occipito-temporal cortex for action prediction.
• Younger adults showed greater parietal region engagement; right posterior parietal cortex activity predicted performance in both groups.

Conclusions:

• Healthy aging is associated with decreased recruitment of sensorimotor processes for action prediction.
• Reduced engagement of visuo-motor areas in older adults may impact social interaction.
• Parietal cortex plays a key role in action prediction performance across the lifespan.