| abstract |
A method for treating a subject having Parkinson's disease or Alzheimer's disease is provided. The method includes noninvasively delivering light energy having a wavelength of about 630 nanometers to about 904 nanometers to the brain of the subject. Delivering the light energy includes (i) irradiating the scalp with light energy having an incident power density between about 10 mW/cm 2 to about 10 W/cm 2 , (ii) transmitting a portion of the light energy through the scalp and the skull to the brain, wherein the transmitted light energy has a power density of at least about 0.01 mW/cm 2 at a depth of approximately 2 centimeters below the dura, or both (i) and (ii). |