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Stiffness Perception using Transcutaneous Electrical Stimulation during Active and Passive Prosthetic Control.

Luis Vargas, Helen Huang, Yong Zhu

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 6, 2020
    PubMed
    Summary

    This study explored stiffness recognition using transcutaneous nerve stimulation with prosthetic hands. Haptic feedback accuracy was similar whether the prosthetic hand was moved passively or actively controlled.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Rehabilitation Technology

    Background:

    • Haptic feedback is crucial for object property identification.
    • Prosthetic devices aim to restore sensory functions, including touch.
    • Understanding haptic perception in prosthetic use is vital for user embodiment and control.

    Purpose of the Study:

    • To evaluate stiffness recognition performance using transcutaneous nerve stimulation (TNS) in a prosthetic hand.
    • To compare haptic perception accuracy between passive and active prosthetic hand control.
    • To investigate the influence of sensorimotor integration on tactile perception.

    Main Methods:

    • Subjects received TNS on their upper arm to evoke sensations in the index finger.
    • A sensorized prosthetic hand generated fingertip forces to modulate stimulation intensity.
    • Object stiffness was encoded by the rate of change in evoked sensation during grasping.
    • Active control involved real-time force-to-stimulation mapping; passive control used prerecorded force data.

    Main Results:

    • Stiffness recognition accuracy was comparable between passive and active prosthetic hand control conditions.
    • One subject exhibited slightly lower accuracy in the active condition, suggesting potential sensorimotor integration effects.
    • TNS effectively conveyed object stiffness information through modulated somatosensory feedback.

    Conclusions:

    • Transcutaneous nerve stimulation can enable object stiffness recognition with prosthetic hands.
    • Haptic perception accuracy is not significantly degraded by active prosthetic control compared to passive movement.
    • Sensorimotor integration may influence individual haptic perception during active prosthetic use.