Sensory feedback by peripheral nerve stimulation improves task performance in individuals with upper limb loss using...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Tactile feedback is essential for effective grip and object manipulation.
• Its absence necessitates reliance on visual and auditory cues for individuals with limb loss.
• Restoring sensory feedback to prosthetic limbs is a key challenge in improving function.

Purpose of the Study:

• To assess the impact of sensory feedback on task performance in individuals with limb loss.
• To evaluate the role of peripheral nerve stimulation in providing tactile sensation to prosthetic users.
• To investigate the effects of sensory feedback on embodiment and self-confidence.

Main Methods:

• Two subjects with limb loss received sensory feedback through implanted cuff electrodes in peripheral nerves.
• Feedback intensity was proportional to forces on the prosthetic hand's fingers during object manipulation.
• Functional tests included object identification, magnetic block retrieval, and the Southampton Hand Assessment Procedure (SHAP).

Main Results:

• Blindfolded performance in object identification and retrieval tasks was comparable to sighted performance with sensory feedback.
• Performance on the SHAP was similar with and without sensory feedback.
• An embodiment survey indicated an improved sense of prosthesis integration with sensory feedback.

Conclusions:

• Sensory feedback delivered through peripheral nerve stimulation significantly enhanced object discrimination and manipulation abilities.
• The study demonstrated improvements in embodiment and user confidence with sensory feedback.
• Results suggest that sensory feedback can partially substitute for visual input in prosthetic hand tasks.