Key result
Medium difficulty parallel cognitive-motor training tasks stimulated stronger oxy-hemoglobin activation (p < 0.01) and promoted stronger network connections than low or high difficulty tasks.
Why the study?
Robot-assisted training with concurrent tasks may promote functional recovery better than single tasks, but the underlying neural mechanisms and inter-regional connectivity changes remain to be characterized.
Does varying the difficulty of parallel cognitive-motor training tasks improve neural activation and connectivity in healthy young adults?
Does varying the difficulty of parallel cognitive-motor training tasks improve neural activation and connectivity in healthy young adults?
p-value: p=< 0.01
Medium difficulty cognitive-motor parallel training tasks stimulate more neural activity and promote stronger network connections compared to low or high difficulty tasks.
May optimize combined-task robot-assisted rehab protocols; leaves open translation to patient outcomes.
Objective: Previous studies suggest that the combination of robot-assisted training with other concurrent tasks may promote the functional recovery and improvement better than the single task. It is well-established that robot-assisted rehabilitation training is effective. This study aims to characterize the neural mechanisms and inter-regional connectivity changes associated with robot-assisted parallel interactive training tasks. Methods: Twenty-five healthy young adults (12 females and 13 males) participated in three number-related cognitive-motor parallel interactive training tasks categorized by difficulty: low difficulty (LD), medium difficulty (MD), and high difficulty (HD). Functional near-infrared spectroscopy was used to measure neural responses in the primary sensorimotor cortex (SM1), supplementary motor area (SMA), and prefrontal cortex (PFC). Activation maps and functional connectivity (FC) correlation matrix maps were applied to assess cortical response and connectivity among channels and regions of interest. Results: Significant differences were observed in both activation and connectivity results across the three training conditions. Stronger activation ( p < 0.01) in oxy-hemoglobin was found in the MD conditions, with activation in the HD condition being stronger than in the LD condition. The FC in the PFC increased linearly with rising training difficulty. Trends in FC for SM1 and SMA were consistent with the activation results. Conclusions: In parallel training tasks of varying difficulty, MD stimulates more neural activity and promotes stronger network connections in the brain. This study enhances the understanding of the neurological processes involved in robot-assisted parallel interactive tasks and may inform more effective robot-assisted rehabilitation therapies.
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Wang et al. (2025) studied Healthy (n=25). Parallel cognitive-motor training tasks of varying difficulty vs. Low, medium, and high difficulty conditions was evaluated on Neural responses and functional connectivity in the primary sensorimotor cortex, supplementary motor area, and prefrontal cortex (p=< 0.01). Medium difficulty parallel cognitive-motor training tasks stimulated stronger oxy-hemoglobin activation (p < 0.01) and promoted stronger network connections than low or high difficulty tasks.
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