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EEG beta-modulations reflect age-specific motor resource allocation during dual-task walking.

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Older adults show distinct brain activity patterns when performing two tasks simultaneously, especially while walking. This research reveals age-specific strategies for managing cognitive resources during dual-task walking.

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Area of Science:

  • Neuroscience
  • Human Motor Control
  • Cognitive Aging

Background:

  • Performing multiple motor tasks concurrently can impair performance due to competition for cognitive resources.
  • Age-related cognitive declines can exacerbate these resource limitations.
  • Neural mechanisms of motor resource allocation during dual-task walking remain poorly understood.

Purpose of the Study:

  • Investigate sensorimotor brain rhythms in younger and older adults during a dual-task walking protocol.
  • Examine age-related differences in motor resource allocation.
  • Understand the neural dynamics of dual-task interference in aging.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity in younger (<35 years) and older (≥70 years) adults.
  • Participants performed a dual-task involving walking and a manual response task (button presses).
  • Time-frequency analysis focused on sensorimotor rhythms (alpha and beta bands) and button press-related desynchronization.

Main Results:

  • Button press-related desynchronization in the beta band was more pronounced in older adults.
  • Both age groups showed reduced desynchronization during walking compared to sitting.
  • Older adults exhibited less modulation of brain rhythms between sitting and walking, with reduced alpha/beta suppression linked to slower walking speed.

Conclusions:

  • Age-specific neural strategies are employed for resource allocation during dual-task walking.
  • Interactions between concurrent motor tasks are reflected in sensorimotor rhythm modulations.
  • Findings highlight the impact of aging on cognitive-motor control during complex tasks.