Patent ID: 8652185

Claim:
An apparatus for stimulating the brain and measuring the light induced neuronal activity comprising: a signal application unit which applies a signal to a living tissue to stimulate the living tissue including neuronal cells; an electrode unit which detects an electrophysiological signal of the living tissue in response to the signal; and an insulation unit which controls an impedance of the electrode unit, wherein the signal application unit is formed integrally with the electrode unit, wherein the electrode unit encloses the signal application unit and the insulation unit encloses part of the electrode unit, wherein the area of the electrode unit enclosed by the insulation unit controls a contact area of the electrode unit with the living tissue thereby controlling an impedance value of the electrode unit, wherein the signal application unit comprises a plurality of optic fibers, wherein the plurality of optic fibers are twisted and heated to join the ends of optic fibers into one piece, wherein the signal applied to the living tissue by the signal application unit includes an activation signal and an inhibition signal, and the neuronal cells in living tissue may be activated or inhibited, wherein the signal application unit comprises a first signal transmitter which transmits the activation signal, a second signal transmitter which transmits the inhibition signal, a first clad, and a second clad, wherein the first clad encloses the first signal transmitter, the second signal transmitter encloses the first clad, the second clad encloses the second signal transmitter, so that an effective treatment area of activation or inhibition is controlled, and wherein the second signal transmitter has a cylindrical shape having a hollow inner space, and wherein the first signal transmitter and the first clad are disposed in the hollow inner space of the second signal transmitter.