Continuous decoding of movement intention of upper limb self-initiated analytic movements from pre-movement EEG correlates

López-Larraz, E. (Universidad de Zaragoza) ; Montesano, L. (Universidad de Zaragoza) ; Gil-Agudo, Á. ; Minguez, J. (Universidad de Zaragoza)

Resumen:  Background: Brain-machine interfaces (BMI) have recently been integrated within motor rehabilitation therapies by actively involving the central nervous system (CNS) within the exercises. For instance, the online decoding of intention of motion of a limb from pre-movement EEG correlates is being used to convert passive rehabilitation strategies into active ones mediated by robotics. As early stages of upper limb motor rehabilitation usually focus on analytic single-joint mobilizations, this paper investigates the feasibility of building BMI decoders for these specific types of movements. Methods: Two different experiments were performed within this study. For the first one, six healthy subjects performed seven self-initiated upper-limb analytic movements, involving from proximal to distal articulations. For the second experiment, three spinal cord injury patients performed two of the previously studied movements with their healthy elbow and paralyzed wrist. In both cases EEG neural correlates such as the event-related desynchronization (ERD) and movement related cortical potentials (MRCP) were analyzed, as well as the accuracies of continuous decoders built using the pre-movement features of these correlates (i.e., the intention of motion was decoded before movement onset). Results: The studied movements could be decoded in both healthy subjects and patients. For healthy subjects there were significant differences in the EEG correlates and decoding accuracies, dependent on the moving joint. Percentages of correctly anticipated trials ranged from 75% to 40% (with chance level being around 20%), with better performances for proximal than for distal movements. For the movements studied for the SCI patients the accuracies were similar to the ones of the healthy subjects. Conclusions: This paper shows how it is possible to build continuous decoders to detect movement intention from EEG correlates for seven different upper-limb analytic movements. Furthermore we report differences in accuracies among movements, which might have an impact on the design of the rehabilitation technologies that will integrate this new type of information. The applicability of the decoders was shown in a clinical population, with similar performances between healthy subjects and patients.

Idioma: Inglés

DOI: 10.1186/1743-0003-11-153

Año: 2014

Publicado en: Journal of NeuroEngineering and Rehabilitation 11, 1 (2014), 153 [15 pp]
ISSN: 1743-0003

Factor impacto JCR: 2.74 (2014)

Categ. JCR: REHABILITATION rank: 6 / 64 = 0.094 (2014) - Q1 - T1
Categ. JCR: ENGINEERING, BIOMEDICAL rank: 24 / 76 = 0.316 (2014) - Q2 - T1
Categ. JCR: NEUROSCIENCES rank: 132 / 252 = 0.524 (2014) - Q3 - T2

Financiación: info:eu-repo/grantAgreement/ES/DGA/T04
Financiación: info:eu-repo/grantAgreement/EC/FP7/270219/EU/Cognitive Control Framework for Robotic Systems/CORBYS
Financiación: info:eu-repo/grantAgreement/EC/FP7/289146/EU/Neural Engineering Transformative Technologies/NETT
Financiación: info:eu-repo/grantAgreement/ES/MINECO/DPI2011-25892
Financiación: info:eu-repo/grantAgreement/ES/MINECO/HYPER-CSD2009-00067

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Ingen.Sistemas y Automát. (Dpto. Informát.Ingenie.Sistms.)
Área (Departamento): Proy. investigación HYA (Dpto. Informát.Ingenie.Sistms.)
Área (Departamento): Área Lenguajes y Sistemas Inf. (Dpto. Informát.Ingenie.Sistms.)