Optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy

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Article on optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy.

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7 p.

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Tam, Nicoladie D. & Zouridakis, George 2013.

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Article on optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy.

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7 p.

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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.

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  • International Journal of Biological Engineering, 2013, El Monte: Scientific and Academic Publishing, pp. 11-17

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  • Publication Title: International Journal of Biological Engineering
  • Volume: 3
  • Issue: 2
  • Page Start: 11
  • Page End: 17
  • Pages: 7
  • Peer Reviewed: Yes

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  • 2013

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  • July 9, 2015, 6:19 a.m.

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  • July 13, 2015, 2:30 p.m.

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Tam, Nicoladie D. & Zouridakis, George. Optical imaging of motor cortical hemodynamic response to directional arm movements using near-infrared spectroscopy, article, 2013; [El Monte, California]. (digital.library.unt.edu/ark:/67531/metadc674028/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.