Abstract
Optical topography (OT), reported in 1995, is a spectroscopic method for noninvasive imaging of brain function. The technique has advantages in safety and lower constraint for subjects compared to other brain imaging methods. In addition, only a simple and easy system is needed for the measurements. These advantages made it possible to approach new themes such as measuring brain function of infants, which had been difficult with conventional techniques. This paper introduces the principle of OT and some representative OT studies, and observes on the current problems and landscapes in OT studies.
