Age-Related Shift in Neuro-Activation during a Word-Matching Task

Area of Science:

• Neuroscience
• Cognitive Psychology
• Aging Research

Background:

• Executive function is crucial for maintaining semantic processing in aging.
• Age-related changes in brain activation supporting executive semantic processing are not well understood.

Purpose of the Study:

• To investigate age-related neuro-functional reorganization in executive semantic processing.
• To identify factors influencing executive control profiles in older adults.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used during a word-matching task.
• Twenty younger and 20 older adults participated, with older adults categorized by cognitive control profiles.
• Behavioral data (response time, accuracy) and cognitive tests were collected.

Main Results:

• Despite equivalent task performance, neuro-functional activation differed in frontoparietal regions between age groups and cognitive profiles.
• A correlation between behavioral measures and brain activity was observed in the left inferior parietal region in older adults.
• Older adults showed greater reliance on inferior parietal regions compared to younger adults.

Conclusions:

• Age-related activation shifts from frontal to parietal regions represent neuro-functional reorganization supporting semantic processing.
• The executive control system remains efficient in healthy aging, supported by parietal regions.
• Cognitive control profiles are associated with distinct neuro-functional reorganization patterns in aging.