Single-site non-invasive peripheral nerve stimulation with multidimensional encoding enables object differentiation...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Technology

Background:

• Evaluating a novel multidimensional encoding approach for sensory feedback in myoelectric prosthetics.
• Focusing on noninvasive peripheral nerve stimulation for object discrimination.
• Utilizing a sensorized myoelectric prosthetic hand to convey tactile information.

Purpose of the Study:

• To assess the efficacy of a multidimensional encoding approach via single-site nerve stimulation.
• To enable object discrimination using a sensorized myoelectric prosthetic hand.
• To investigate sensory perception in phantom limbs for prosthetic users.

Main Methods:

• Transcutaneous electrical neural stimulation (TENS) with channel-hopping interleaved pulse scheduling (CHIPS) applied to the median or ulnar nerve.
• Participants performed object discrimination tasks (size and compliance) while blindfolded.
• Sensory data from prosthetic hand sensors mapped to stimulation values for a single sensory percept region.

Main Results:

• All participants successfully identified objects significantly above chance level.
• Amputee participants effectively used phantom limb sensations for object differentiation.
• Performance in amputee participants was comparable to, or better than, non-amputee participants.

Conclusions:

• The multidimensional encoding approach reliably transmits object size and compliance information.
• This method enables complex sensation perception in the phantom limb.
• It offers a promising advancement for haptic feedback in prosthetics, potentially reducing abandonment.