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Rev Sci Instrum. 2012 May;83(5):056101. doi: 10.1063/1.4704456.

Note: wearable near-infrared spectroscopy imager for haired region.

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Central Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan.


A wearable optical topography system was developed that is based on near-infrared spectroscopy (NIRS) for observing brain activity noninvasively including in regions covered by hair. An avalanche photo diode, high voltage dc-dc converter, and preamplifier were placed in an electrically shielded case to be safely mounted on the head. Rubber teeth and a glass rod were prepared to clear away hair and reach the scalp. These devices realized for the first time a wearable NIRS imager for any region of the cortex. The activity in the motor cortex during finger tapping was successfully observed.

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