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Updated: Aug 14, 2025

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

Published on: January 7, 2019

Haptic shared control improves neural efficiency during myoelectric prosthesis use.

Neha Thomas¹, Alexandra J Miller², Hasan Ayaz^3,4,5,6,7

¹Department of Biomedical Engineering, Johns Hopkins University, Baltimore, 21218, USA. neha.thomas@jhmi.edu.

Scientific Reports

|January 10, 2023

Summary

Shared control myoelectric prostheses with haptic feedback improve neural efficiency for prosthetic users. This combined approach enhances task performance and reduces mental effort, paving the way for advanced prosthetic technology.

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Area of Science:

Biomedical Engineering
Neuroscience
Rehabilitation Technology

Background:

Clinical myoelectric prostheses lack sensory feedback and dexterity, hindering daily activities.
Haptic feedback and autonomous control improve prosthesis utility but are rarely combined.
Neural efficiency, measuring brain activity relative to task performance, is a novel metric for evaluating prosthetic systems.

Purpose of the Study:

To evaluate the neural efficiency of a myoelectric prosthesis with haptic shared control.
To compare a haptic shared control prosthesis with standard myoelectric prostheses (with and without haptic feedback).
To assess the impact of vibrotactile feedback and autonomous grasping on task performance and mental effort.

Main Methods:

30 non-amputee participants performed a grasp-and-lift task with different prosthesis configurations.
Functional near-infrared spectroscopy (fNIRS) measured prefrontal cortex activity as an indicator of mental effort.
Task performance metrics were analyzed alongside neural efficiency.

Main Results:

The haptic shared control system was the only configuration to achieve high neural efficiency.
Vibrotactile feedback was crucial for users to achieve appropriate grip force.
The combined system demonstrated synergistic benefits of haptic feedback and autonomous control.

Conclusions:

Haptic shared control represents a significant advancement in myoelectric prosthesis technology.
Integrating sensory feedback with autonomous control enhances user performance and reduces cognitive load.
This approach holds promise for developing more intuitive and effective prosthetic devices.