Multiunit Activity-Based Real-Time Limb-State Estimation from Dorsal Root Ganglion Recordings

Title
Multiunit Activity-Based Real-Time Limb-State Estimation from Dorsal Root Ganglion Recordings
Authors
윤인찬김형민한성민추준욱박종웅
Keywords
dynamic system; neural decoding; dorsal root ganglion; multiunit activity; proprioception; afferent; neural network
Issue Date
2017-03
Publisher
Scientific Reports
Citation
VOL 7-44197-14
Abstract
Proprioceptive afferent activities could be useful for providing sensory feedback signals for closed-loop control during functional electrical stimulation (FES). However, most previous studies have used the single-unit activity of individual neurons to extract sensory information from proprioceptive afferents. This study proposes a new decoding method to estimate ankle and knee joint angles using multiunit activity data. Proprioceptive afferent signals were recorded from a dorsal root ganglion with a singleshank microelectrode during passive movements of the ankle and knee joints, and joint angles were measured as kinematic data. The mean absolute value (MAV) was extracted from the multiunit activity data, and a dynamically driven recurrent neural network (DDRNN) was used to estimate ankle and knee joint angles. The multiunit activity-based MAV feature was sufficiently informative to estimate limb states, and the DDRNN showed a better decoding performance than conventional linear estimators. In addition, processing time delay satisfied real-time constraints. These results demonstrated that the proposed method could be applicable for providing real-time sensory feedback signals in closed-loop FES systems.
URI
http://pubs.kist.re.kr/handle/201004/69681
ISSN
2045-2322
Appears in Collections:
KIST Publication > Article
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