Abstract
A light source, which produces many bright spots and can change its number dynamically, was developed two ways. One was with a computer simulation, and the other was an experiment employing a rotating discwith a white-light laser. These light sources were applied to optical stimulation of the human cerebrum, and the strength of the cerebral reaction was measured using optical topography(OT). The primary findings were that, (1)Younger subjects(20's)were most sensitive, followed by middle-aged subjects(50's), and finally senior-aged subjects(60's), (2)Oxygenated hemoglobin exhibited an increasing tendency in response to optical stimulation, whereas deoxygenated hemoglobin showed little changeable tendency, (3)The rotation period of the disk, and thus the flickering speed of the light spots, at T=2. 4s presented stronger stimulation, while stimulation decayed at a longer period T=4. 8s in the case of the experiment, but vice versa with the light source produced by computer simulation.
