Non-invasive somatotopic proprioceptive feedback for closed-loop robotic hand aperture control.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Technology

Background:

• Robotic prostheses for transradial amputation often lack proprioceptive feedback, hindering precise control and increasing visual dependence.
• Restoring physiological feedback is crucial for improving prosthetic limb function and user experience.

Purpose of the Study:

• To investigate the efficacy of non-invasive somatotopic feedback using transcutaneous electrical nerve stimulation (TENS) for conveying hand aperture information.
• To determine if TENS-based artificial proprioception can mitigate control challenges and reduce reliance on vision in prosthetic hand users.

Main Methods:

• Twenty healthy participants performed an aperture control task under visual and non-visual conditions, with or without TENS feedback.
• A Stroop task was included to assess cognitive load during the aperture control task.
• Control accuracy, learning rates, and visual dependence were compared between groups with and without TENS feedback.

Main Results:

• Participants receiving TENS feedback demonstrated significantly reduced aperture control errors under visual deprivation compared to the control group.
• TENS-based feedback enabled immediate control accuracy comparable to visual input.
• The TENS group maintained cognitive performance and effective hand control even when performing a secondary task.

Conclusions:

• Non-invasive somatotopic proprioceptive feedback via TENS holds significant potential for restoring proprioceptive function in prosthetic hand users.
• This approach offers a physiologically meaningful way to enhance prosthetic hand control and reduce user reliance on visual input.