A recent study published in the journal Neurobiology of Aging highlights significant age-related differences in brain function and structure related to motor skill acquisition. Sarah N. Kraeutner and colleagues from Simon Fraser University and the University of British Columbia conducted research on how healthy aging affects the brain’s capacity for learning new motor skills.
The study focused on changes in the frontoparietal network, a brain region critical for motor skill learning. Researchers employed resting-state functional connectivity (rsFC) and diffusion tensor imaging (DTI) to assess functional and structural changes in the brains of healthy older and younger adults. Participants engaged in four weeks of skilled motor practice involving a complex, gamified reaching task.
One of the central findings was that motor skill acquisition in healthy older adults was associated with decreased rsFC in the frontoparietal network. In contrast, younger adults exhibited increased rsFC in the same network during motor skill learning. This divergence suggests that the brain’s functional reorganisation in response to motor practice varies significantly with age.
The decrease in rsFC among older adults might indicate a shift to alternate neural circuits to support motor learning. Specifically, older participants showed increased connectivity between the right posterior parietal cortex and the precuneus, a region involved in spatial processing. This shift may reflect an enhanced reliance on visuospatial information to compensate for age-related declines in motor skill acquisition capacity.
The study also looked at the microstructure of white matter in the frontoparietal tracts by measuring fractional anisotropy (FA) with DTI scans. Results indicated that older adults had lower FA values in these tracts compared to younger adults. Interestingly, lower FA was associated with a faster rate of skill acquisition across both age groups, though it also correlated with an earlier plateau in performance improvements.
These findings suggest that while reduced white matter integrity is typically seen as a marker of ageing, it might also be linked to certain aspects of motor skill learning. Lower FA could indicate greater neural plasticity, facilitating faster initial learning phases but limiting sustained improvement.
This research provides crucial insights into how the ageing brain adapts to motor learning tasks. The observed functional and structural changes underline the importance of developing age-specific training and rehabilitation programmes. For older adults, strategies that enhance visuospatial processing might be particularly beneficial in improving motor skills.
The study’s findings on white matter integrity could inform future interventions aimed at maintaining or enhancing motor learning capacities in older populations. Understanding the nuanced role of white matter microstructure in skill acquisition could lead to more targeted and effective rehabilitation techniques for age-related motor deficits.
