To solve the problem that the optical brain-function measurement apparatus of the prior art, once worn around the head of a subject, is difficult to change the position of the light source unit or the detection unit, so that it is not suited for measuring brain functions at an arbitrary position.SOLUTION: An optical brain-function measurement apparatus includes: a light source unit for generating infrared light to be applied to a human head; a detection unit for detecting infrared light that is diffused and reflected within the human head and exits the head from one or more head positions; and an optical system for guiding infrared light emitted from the light source unit to the human head and for controlling an infrared-light application position on a surface of the human head. At least one of the light source unit and the detection unit is a non-contact type, which is not brought into contact with a human body. One or more human head positions from which infrared light exit and are detected by the detection unit include positions that are different from the infrared-light application positions controlled by the optical system.SELECTED DRAWING: Figure 1
OPTICAL BRAIN-FUNCTION MEASUREMENT APPARATUS