In re じent yoars, NIRS has been widcly utiiized fc )r mo 煎 oring oxygcn mc1abolism of human brain . Though NrRS cal) metIs し[ re two kinds of hemoglobin , only oxy − Hb has received attention as a c 撤 e抽 n f{ ) r judgment of a brain function . There 食}re , implicatlons of changes in deexy − Hb have no { been revealed enough and have to be invcStigated frOlll a physical viewp 〔 }in し In tbis stud 払 numerical simulation of oxygen trang . port to cerebral tissue is conducted to obtain transicnt

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... oglobin changes with different bloed flow rate Io shor し st 艮 mu 正 a 亡 ions, Our numerical rcsults suggest that increase in deoxy−Hb during stimuli sbows physiological signais coming from capillarjcs .