1. Compensation Strategies for Bioelectric Signal Changes in Chronic Selective Nerve Cuff Recordings: A Simulation Study
- Author
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Ryan G. L. Koh, Stephen Sammut, and José Zariffa
- Subjects
Nervous system ,030506 rehabilitation ,Computer science ,02 engineering and technology ,lcsh:Chemical technology ,Biochemistry ,Convolutional neural network ,Signal ,Analytical Chemistry ,Compensation (engineering) ,Machine Learning ,0302 clinical medicine ,Peripheral nerve interface ,neural interfaces ,lcsh:TP1-1185 ,Nerve cuff ,Instrumentation ,Signal Processing, Computer-Assisted ,Neural engineering ,Sciatic Nerve ,Atomic and Molecular Physics, and Optics ,Neuromodulation (medicine) ,Electrodes, Implanted ,medicine.anatomical_structure ,peripheral nerve ,0305 other medical science ,Algorithms ,chronic implantation ,0206 medical engineering ,Sensory system ,selective recording ,nerve cuff electrode ,Models, Biological ,Article ,03 medical and health sciences ,Peripheral nerve ,medicine ,Animals ,Humans ,Computer Simulation ,Peripheral Nerves ,Electrical and Electronic Engineering ,self-learning ,neural recording ,Cuff electrode ,020601 biomedical engineering ,Rats ,encapsulation tissue ,Neural Networks, Computer ,030217 neurology & neurosurgery ,Biomedical engineering - Abstract
Peripheral nerve interfaces (PNIs) allow us to extract motor, sensory and autonomic information from the nervous system and use it as control signals in neuroprosthetic and neuromodulation applications. Recent efforts have aimed to improve the recording selectivity of PNIs, including by using spatiotemporal patterns from multi-contact nerve cuff electrodes as input to a convolutional neural network (CNN). Before such a methodology can be translated to humans, its performance in chronic implantation scenarios must be evaluated. In this simulation study, approaches were evaluated for maintaining selective recording performance in the presence of two chronic implantation challenges: the growth of encapsulation tissue and rotation of the nerve cuff electrode. Performance over time was examined in three conditions: training the CNN at baseline only, supervised re-training with explicitly labeled data at periodic intervals, and a semi-supervised self-learning approach. This study demonstrated that a selective recording algorithm trained at baseline will likely fail over time due to changes in signal characteristics resulting from the chronic challenges. Results further showed that periodically recalibrating the selective recording algorithm can maintain its performance over time, and that a self-learning approach has the potential to reduce the frequency of recalibration.
- Published
- 2021