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Related Concept Videos

Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

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Overview of an ongoing clinical trial on hand prostheses: Toward use of synergy-based prosthetic hands for activities of daily living by transradial amputees.

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Tactile Perception in Upper Limb Prostheses: Mechanical Characterization, Human Experiments, and Computational

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    Summary
    This summary is machine-generated.

    Rigid upper-limb prostheses transmit tactile information via socket vibrations, enabling users to identify contacted fingers. Advanced prosthetics show reduced tactile discrimination, but machine learning offers potential for enhancement.

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    Area of Science:

    • Biomedical Engineering
    • Human-Computer Interaction
    • Robotics

    Background:

    • Tactile feedback is crucial for upper-limb prostheses, but current implementations increase cognitive load.
    • Socket vibrations offer a passive method for transmitting tactile information, even to untrained users.

    Purpose of the Study:

    • To investigate the efficacy of socket vibrations for tactile feedback in upper-limb prostheses of varying complexity.
    • To understand the mechanical factors influencing vibration transmission and tactile discrimination.

    Main Methods:

    • Experiments with passive and advanced articulated hands to assess human tactile discrimination.
    • Numerical and mechanical vibration tests on four prostheses.
    • Development of a machine-learning classifier to identify contacted fingers from socket signals.

    Main Results:

    • Rigid prostheses achieved 83% accuracy in discriminating index finger contacts via socket vibrations.
    • Human tactile discrimination decreased with increasing hand complexity.
    • Machine learning outperformed human performance in tactile discrimination for advanced hands.

    Conclusions:

    • Rigid prostheses naturally transmit vibrations, potentially reducing the need for active tactile feedback devices.
    • Advanced prosthetics may require dedicated tactile feedback solutions.
    • Machine learning shows promise for improving vibration-transmitted tactile discrimination in complex prostheses.