Noninvasive functional imaging of the human brain using light
Benaron DA, Hintz SR, Villringer A, Boas DA, Kleinschmidt A, Frahm J, Hirth C, Obrig H, van Houten JC, Kermit EL, Cheong WF, Stevenson DK. Noninvasive functional imaging of the human brain using light. J. Cerebral Blood Flow and Metabolism. 2000; 20:469-477.