A mental workload and biomechanical assessment during split-belt locomotor adaptation with and without optic flow.

Autor: Mahon CE; Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, VA, USA.; Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA., Hendershot BD; Research and Surveillance Section, Extremity Trauma and Amputation Center of Excellence, Defense Health Agency, Falls Church, VA, USA.; Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA.; Department of Physical Medicine and Rehabilitation, Uniformed Services University of the Health Sciences, Bethesda, MD, USA., Gaskins C; Cognitive Motor Neuroscience Laboratory, Department of Kinesiology, School of Public Health (Bldg #255), University of Maryland, room #2138, College Park, MD, 20742, USA.; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA., Hatfield BD; Cognitive Motor Neuroscience Laboratory, Department of Kinesiology, School of Public Health (Bldg #255), University of Maryland, room #2138, College Park, MD, 20742, USA.; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA., Shaw EP; Cognitive Motor Neuroscience Laboratory, Department of Kinesiology, School of Public Health (Bldg #255), University of Maryland, room #2138, College Park, MD, 20742, USA. eshaw210@umd.edu.; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA. eshaw210@umd.edu., Gentili RJ; Cognitive Motor Neuroscience Laboratory, Department of Kinesiology, School of Public Health (Bldg #255), University of Maryland, room #2138, College Park, MD, 20742, USA. rodolphe@umd.edu.; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA. rodolphe@umd.edu.; Maryland Robotics Center, University of Maryland, College Park, MD, USA. rodolphe@umd.edu.
Jazyk: angličtina
Zdroj: Experimental brain research [Exp Brain Res] 2023 Jul; Vol. 241 (7), pp. 1945-1958. Date of Electronic Publication: 2023 Jun 26.
DOI: 10.1007/s00221-023-06609-6
Abstrakt: Adaptive human performance relies on the central nervous system to regulate the engagement of cognitive-motor resources as task demands vary. Despite numerous studies which employed a split-belt induced perturbation to examine biomechanical outcomes during locomotor adaptation, none concurrently examined the cerebral cortical dynamics to assess changes in mental workload. Additionally, while prior work suggests that optic flow provides critical information for walking regulation, a few studies have manipulated visual inputs during adaption to split-belt walking. This study aimed to examine the concurrent modulation of gait and Electroencephalography (EEG) cortical dynamics underlying mental workload during split-belt locomotor adaptation, with and without optic flow. Thirteen uninjured participants with minimal inherent walking asymmetries at baseline underwent adaptation, while temporal-spatial gait and EEG spectral metrics were recorded. The results revealed a reduction in step length and time asymmetry from early to late adaptation, accompanied by an elevated frontal and temporal theta power; the former being well corelated to biomechanical changes. While the absence of optic flow during adaptation did not affect temporal-spatial gait metrics, it led to an increase of theta and low-alpha power. Thus, as individuals adapt their locomotor patterns, the cognitive-motor resources underlying the encoding and consolidation processes of the procedural memory were recruited to acquire a new internal model of the perturbation. Also, when adaption occurs without optic flow, a further reduction of arousal is accompanied with an elevation of attentional engagement due to enhanced neurocognitive resources likely to maintain adaptive walking patterns.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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