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An Investigation of Manifold-Based Direct Control for a Brain-to-Body Neural Bypass.

E Losanno^1,2, M Badi³, E Roussinova³

¹The Biorobotics Institute and Department of Excellence in Robotics and AIScuola Superiore Sant'Anna 56025 Pisa Italy.

IEEE Open Journal of Engineering in Medicine and Biology

|May 20, 2024

Summary

Researchers developed a new brain-body interface (BBI) strategy for restoring hand control in paralysis. This manifold-based approach allows intuitive and stable control by directly decoding neural activity, showing promise for brain-controlled prosthetics.

Keywords:

Brain-body interfaces direct control hand movement control neural manifold peripheral neurostimulation

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Published on: August 18, 2018

Area of Science:

Neuroscience
Biomedical Engineering
Rehabilitation Technology

Background:

Brain-body interfaces (BBIs) offer a promising avenue for restoring motor function in individuals with paralysis.
Effective BBI control requires intuitive, accurate, and stable decoding of motor commands from neural signals.
Current BBI systems often face challenges in learning ease and long-term robustness.

Purpose of the Study:

To investigate a novel brain decoding strategy for BBIs based on direct coupling of neural ensembles and output variables.
To achieve ease of learning and long-term robustness in BBI control.
To demonstrate the potential of this strategy for restoring voluntary hand control.

Main Methods:

Identified a low-dimensional neural activity space (manifold) capturing co-variation patterns during reach-to-grasp movements in a monkey model.
Tested direct computer cursor control using cortical activity along identified manifold axes.
Implemented daily recalibration of scaling factors for adaptive control.

Main Results:

Achieved rapid learning and stable, high performance in 2D cursor control tasks over 12 weeks.
Demonstrated the effectiveness of the manifold-based decoding strategy for intuitive and robust BBI control.
Showcased successful coupling of the BBI decoding strategy with peripheral nerve stimulation for voluntary hand movement.

Conclusions:

The study presents a proof of concept for manifold-based direct control in brain-body interface applications.
This approach facilitates intuitive and stable control, addressing key challenges in BBI development.
The findings suggest a promising direction for restoring hand function in individuals with upper-limb paralysis.