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A graduate student wears a device for near-infrared spectroscopy (NIRS), also called optical topography, for a demonstration to investigate cerebral hemodynamics in a medical examination room at the University of Tokyo Hospital in Tokyo, Japan, on Thursday, Jan. 30, 2014, A graduate student demonstrates an investigation of cerebral hemodynamics in a medical examination room, A professor of the Department of Neuropsychiatry at the University of Tokyo's Graduate School of Medicine, left, and graduate students check the results on a computer, The results of an investigation of cerebral hemodynamics using NIRS are displayed on a monitor, General views molecular genetics and behavioral analysis laboratory Tour Of The University Of Tokyo Neuroscience Lab on January 30, 2014 in Tokyo, Japan (Footage by BBV/Getty Images)