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Journal of Biomedical Optics • Open Access

Noninvasive imaging of prefrontal activation during attention-demanding tasks performed while walking using a wearable optical topography system
Author(s): Hirokazu Atsumori; Masashi Kiguchi; Takusige Katura; Tsukasa Funane; Akiko Obata; Hiroki Sato; Takaaki Manaka; Mitumasa Iwamoto; Atsushi Maki; Hideaki Koizumi; Kisou Kubota

Paper Abstract

Optical topography (OT) based on near-infrared spectroscopy is a noninvasive technique for mapping the relative concentration changes in oxygenated and deoxygenated hemoglobin (oxy- and deoxy-Hb, respectively) in the human cerebral cortex. In our previous study, we developed a small and light wearable optical topography (WOT) system that covers the entire forehead for monitoring prefrontal activation. In the present study, we examine whether the WOT system is applicable to OT measurement while walking, which has been difficult with conventional OT systems. We conduct OT measurements while subjects perform an attention-demanding (AD) task of balancing a ping-pong ball on a small card while walking. The measured time course and power spectra of the relative concentration changes in oxy- and deoxy-Hb show that the step-related changes in the oxy- and deoxy-Hb signals are negligible compared to the task-related changes. Statistical assessment of the task-related changes in the oxy-Hb signals show that the dorsolateral prefrontal cortex and rostral prefrontal area are significantly activated during the AD task. These results suggest that our functional imaging technique with the WOT system is applicable to OT measurement while walking, and will be a powerful tool for evaluating brain activation in a natural environment.

Paper Details

Date Published: 1 July 2010
PDF: 7 pages
J. Biomed. Opt. 15(4) 046002 doi: 10.1117/1.3462996
Published in: Journal of Biomedical Optics Volume 15, Issue 4
Show Author Affiliations
Hirokazu Atsumori, Hitachi, Ltd. (Japan)
Masashi Kiguchi, Hitachi, Ltd. (Japan)
Takusige Katura, Hitachi, Ltd. (Japan)
Tsukasa Funane, Hitachi, Ltd. (Japan)
Akiko Obata, Hitachi, Ltd. (Japan)
Hiroki Sato, Hitachi, Ltd. (Japan)
Takaaki Manaka, Tokyo Institute of Technology (Japan)
Mitumasa Iwamoto, Tokyo Institute of Technology (Japan)
Atsushi Maki, Hitachi, Ltd. (Japan)
Hideaki Koizumi, Hitachi, Ltd. (Japan)
Kisou Kubota, Hitachi, Ltd. (Japan)


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