Optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy Metadata
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- Main Title Optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy
Author: Tam, Nicoladie D.Creator Type: PersonalCreator Info: University of North Texas
Author: Zouridakis, GeorgeCreator Type: PersonalCreator Info: University of Houston
Name: Scientific and Academic PublishingPlace of Publication: [El Monte, California]
- Creation: 2013
- Content Description: Article on optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy.
- Physical Description: 7 p.
- Keyword: near-infrared spectroscopy
- Keyword: motor cortex
- Keyword: directional arm movements
- Keyword: optical imaging
- Keyword: hemodynamic response
- Journal: International Journal of Biological Engineering, 2013, El Monte: Scientific and Academic Publishing, pp. 11-17
- Publication Title: International Journal of Biological Engineering
- Volume: 3
- Issue: 2
- Page Start: 11
- Page End: 17
- Pages: 7
- Peer Reviewed: True
Name: UNT Scholarly WorksCode: UNTSW
Name: UNT College of Arts and SciencesCode: UNTCAS
- Rights Access: public
- DOI: 10.5923/j.ijbe.20130302.01
- Archival Resource Key: ark:/67531/metadc674028
- Academic Department: Biological Sciences
- Display Note: Abstract: This study aims to determining arm-movement directions from functional near-infrared spectroscopy (fNIRS) hemodynamic signals in order to decode intentional motor commands, originating in the motor cortices of humans, which could be implemented in neuroprosthetic assistive devices for assisting the physically disabled. Motor cortical hemodynamic responses were recorded using 64 spatially distributed optrodes from 14 normal subjects during free arm orthogonal movements in the x- and y-directions on a horizontal plane. The time course of oxy-(HbO2) and deoxy-hemoglobin (Hb), and of their summation (HbO2 + Hb) and difference (HbO2 - Hb) signals, representing the hemodynamic profiles of total oxygen delivery and extraction, respectively, were computed for the localized neuronal populations in the motor cortices underlying the optrodes. Analysis of the above hemodynamic signals revealed that they could be temporally, spatially, or spatiotemporally decoupled, depending on the movement direction. Thus, by analyzing the spatiotemporal profiles of brain activation we could identify the direction of the orthogonal movements uniquely. Our findings demonstrate that movement direction, a key feature of motor commands, can be reliably extracted in real-time from surface recorded fNIRS signals, and support their viability in future noninvasive assistive devices.