Evoked Haptic Sensation in the Hand With Concurrent Non-Invasive Nerve Stimulation

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Technology

Background:

• Haptic perception is crucial for intuitive control of prosthetic hands.
• Transcutaneous nerve stimulation (TNS) offers a potential pathway for restoring tactile feedback.

Purpose of the Study:

• To evaluate haptic perception evoked by concurrent TNS trains via multiple channels.
• To determine if combined sensations from dual stimulation can be constructed from single stimulation points.

Main Methods:

• A 2x8 electrode grid delivered bipolar stimulation to median and ulnar nerves.
• Concurrent dual stimulation with varying phase delays was compared to single stimulation.
• Temporal delay and short-term stability of evoked sensations were assessed.

Main Results:

• Evoked sensations during dual stimulation were primarily a direct summation of single stimulations.
• Minimal interference was observed between concurrent stimulation trains.
• Haptic sensations remained stable over repeated testing within a session.

Conclusions:

• Haptic sensations in different hand regions can be constructed by directly combining responses from multiple stimulation trains.
• Minimal interference suggests a robust method for creating tactile feedback.