Fig. 9.

Effect of strychnine and TTX on excitatory input to ganglion cells. The superimposed traces show the inward currents elicited by the same diffuse light flash (indicated byhorizontal line above responses) in control solution (control) and in the presence of 2 μm strychnine (STR) and 500 nmTTX. Strychnine was applied after recovery following washout of TTX. Bath contained 150 μm picrotoxin. Cells were voltage-clamped at the reversal potential for chloride ions (−65 mV) to eliminate glycine-mediated responses. Holding current was −12 pA.