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. Author manuscript; available in PMC: 2008 Jun 21.
Published in final edited form as: Eur J Neurosci. 2003 May;17(9):1727–1735. doi: 10.1046/j.1460-9568.2003.02594.x

FIG. 5.

FIG. 5

Current–voltage relationship of the light-activated current. (A) The lower panel shows the light response (black bar; irradiance 5.8×10−5W/cm2) of an SCN-projecting RGC recorded in voltage-clamp mode. To illustrate the similar time courses, a light response recorded in current-clamp mode is shown in the upper panel. (B)To determine the voltage dependence of the light-activated current, voltage ramps (−100 to +100 mVover 2 s) were applied before and during illumination. (C) The light-activated current (red) was determined by subtracting currents elicited by the voltage ramp before (black) and during (blue) illumination.