title: Individual differences in blood volume and oxygenation in the brain during a cognitive task based on time-resolved spectroscopic measurements.
abstract: Although a time-resolved near-infrared spectroscopy (TRS) system is difficult to make a measurement into 10 s or less at the moment, the system has a great advantage that it measures absolute values of hemoglobin concentrations. In the present study, using a device equipped with a TRS system, we examined individual differences in changes in cerebral oxygenated, deoxygenated, and total hemoglobin concentrations during two repetitive executions of a cognitive task, and compared these with data from our previous studies performed with a CWS system. As a result, large individual differences were also observed in changes in the cerebral hemoglobin concentrations during a cognitive task in this study using a TRS system. We therefore conclude that large individual differences observed in changes in the cerebral hemoglobin concentrations during a cognitive task in our previous studies using a continuous wave near-infrared spectroscopy (CWS) system would probably be universal, although a CWS system includes the limitation that the absolute value is unable to be measured in the system.
authors.affiliation: Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan. niioka@ees.hokudai.ac.jp
authors.forename: Tadashi
authors.initials: T
authors.lastname: Niioka
authors.forename: Soichiro
authors.initials: S
authors.lastname: Ohnuki
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Miyazaki
mesh_terms: D000328:Adult; D001810:Blood Volume / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D003071:Cognition / Q000502:physiology*; D006801:Humans; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D010108:Oxyhemoglobins / Q000378:metabolism; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013647:Task Performance and Analysis; D013997:Time Factors
chemical_list: D010108:Oxyhemoglobins; D010100:Oxygen