Fig. 2

Biological mechanisms of near-infrared (NIR) light irradiating brain. They include cerebral functional states after intracellularly and intercellularly regulatory mechanisms have been applied and when neurons are irradiated by NIR light. Intracellular changes include cytochrome C oxidase, N-methyl-D-aspartic acid receptor and reactive oxygen species mediated mechanism whilst extracellular changes are enhanced neuronal transmission and connections