Effect of Parallel Cognitive-Motor Training Tasks on Hemodynamic Responses in Robot-Assisted Rehabilitation

Area of Science:

• Neuroscience
• Rehabilitation Engineering
• Cognitive Motor Science

Background:

• Robot-assisted rehabilitation training is effective for functional recovery.
• Combining robot-assisted training with concurrent tasks may improve outcomes.
• Understanding neural mechanisms of parallel interactive tasks is crucial.

Purpose of the Study:

• To investigate neural mechanisms and inter-regional connectivity changes during robot-assisted parallel interactive training.
• To compare brain responses across different task difficulties (low, medium, high).

Main Methods:

• Twenty-five healthy adults performed number-related cognitive-motor tasks.
• Functional near-infrared spectroscopy (fNIRS) measured neural responses in sensorimotor cortex (SM1), supplementary motor area (SMA), and prefrontal cortex (PFC).
• Activation and functional connectivity (FC) were analyzed across task difficulties.

Main Results:

• Medium difficulty tasks showed significantly higher oxy-hemoglobin activation (p < 0.01) compared to low and high difficulty.
• Prefrontal cortex (PFC) functional connectivity increased linearly with task difficulty.
• Sensorimotor cortex (SM1) and supplementary motor area (SMA) connectivity trends mirrored activation patterns.

Conclusions:

• Medium difficulty robot-assisted parallel tasks optimally stimulate neural activity and strengthen brain network connections.
• Findings provide insights into neurological processes underlying robot-assisted parallel training.
• This research can inform the development of more effective robot-assisted rehabilitation strategies.