Object Shape and Surface Topology Recognition Using Tactile Feedback Evoked through Transcutaneous Nerve Stimulation

Area of Science:

• Neuroscience
• Biomedical Engineering
• Haptics

Background:

• Tactile feedback is essential for object property discrimination.
• Current prosthetic technologies often lack sophisticated tactile sensation.
• Restoring tactile feedback is crucial for improving prosthetic functionality.

Purpose of the Study:

• To investigate the use of transcutaneous nerve stimulation for evoking tactile feedback.
• To determine if this feedback can be used to detect object shape and surface topology.
• To assess the potential for improving prosthetic hand control.

Main Methods:

• An electrode grid stimulated median and ulnar nerve bundles to evoke tactile sensations.
• Prosthetic fingertip forces were converted to electrical stimulation current amplitude.
• Object shape and surface topology were encoded via stimulation timing and amplitude.

Main Results:

• Subjects achieved >84% success in determining object shape using evoked tactile feedback.
• Recognition of surface topology (ridge height, spacing) exceeded 81% success rates.
• The system successfully translated tactile properties into discernible sensations.

Conclusions:

• Transcutaneous nerve stimulation effectively evokes tactile feedback for object property recognition.
• This method enables the differentiation of object shape and surface topology.
• The findings support the integration of this tactile feedback system for advanced prosthetic control.