Age-related frontal hyperactivation observed across different working memory tasks: an fMRI study
Mohammad Fakhri1, Hajir Sikaroodi, Farid Maleki
1NeuroImaging and Analysis Group, Research Center for Molecular and Cellular Imaging, Tehran, Iran.
Behavioural Neurology
|August 14, 2012
Summary
Frontal regions are key for working memory (WM) across tasks. Aging affects WM, with reduced sensory cortex activity but increased prefrontal cortex activation, possibly as a compensation.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Human Brain Function
Background:
- Working memory (WM) is crucial for cognitive tasks.
- Understanding age-related changes in WM is vital for healthy aging research.
- Functional magnetic resonance imaging (fMRI) is a key tool for studying brain activity during cognitive tasks.
Purpose of the Study:
- To investigate activation patterns in three distinct working memory tasks.
- To compare these patterns across two different age groups.
- To identify the impact of task type and age on brain activation during working memory.
Main Methods:
- Thirty-five healthy volunteers participated, selected from age extremes.
- Participants completed visual, verbal, and auditory working memory tasks.
- The General Linear Model and Combined Task Analysis were used to analyze fMRI data.
Main Results:
- Frontal regions showed consistent activation across all working memory tasks.
- Age-related decreases in visual and auditory cortex activity were observed.
- An increase in prefrontal cortex activation was noted with age across all tasks.
Conclusions:
- Frontal regions are critical for working memory, irrespective of stimulus type.
- Age significantly impacts activation patterns in these frontal regions.
- Increased prefrontal activity in older adults may compensate for age-related sensory decline.
