Age-related differences in brain activation during working memory updating: An fMRI study

Area of Science:

• Neuroscience
• Cognitive Psychology
• Aging Research

Background:

• Neuroimaging studies indicate age-related decreases in brain activation during working memory tasks.
• Previous research has not fully explored age-related differences in the updating mechanism of working memory.

Purpose of the Study:

• To investigate age-related differences in brain activation during the updating mechanism of working memory.
• To examine neuromodulation changes in response to updating demands across different age groups, including young-old and old-old cohorts.

Main Methods:

• Functional magnetic resonance imaging (fMRI) with a hybrid block/event-related design.
• Analysis of blood-oxygen-level-dependent (BOLD) signals to assess neuromodulation.
• Comparison of brain activation patterns between younger adults, young-old adults, and old-old adults.

Main Results:

• Younger adults showed increased activation in the left precentral gyrus and right cerebellum during updating tasks.
• Older adults exhibited reduced neuromodulation in these regions, with the old-old cohort showing no significant activation.
• Older adults, especially the old-old, displayed reduced suppression and overactivation of default mode network (DMN) regions and contralateral areas, correlating with poorer performance.

Conclusions:

• Neuromodulation in response to updating demands diminishes with healthy aging.
• Older adults show maladaptive increases in task-irrelevant brain region activation and reduced hemispheric specificity during updating.
• These age-related cognitive control deficits are more pronounced in the oldest age groups within healthy aging.