Fig. 4. Effects of adaptation on theI(X) relation obtained with fluid-jet stimuli. A, Two series of 10 msec test steps were delivered, one before and one 125 msec after the onset of a +1.3 μm conditioning step. The peak currents evoked by each series are plotted in B versus deflection. Traces are averages of five records. Cell A961127, P7, type II. B,I(X) curves generated from the data shown in A and additional traces not shown inA. The arrow indicates the size of the conditioning step. Parameters for the nonadaptedI(X) relation (circles) were OR, 1.0 μm;Imax, −97 pA;Irest, 5.9% ofImax;P1, 0.16;P2, 0.38;A1, 8.71;A2, 3.16. Parameters for the adaptedI(X) relation (squares) were OR, 1.4 μm;Imax, −64 pA;P1, 8.75;P2, 0.14;A1, 0.43;A2, 2.69. C, Protocol was identical to that of Fig. A except that the conditioning step was −0.9 μm. Peak currents are plotted inD versus deflection. Average of nine records. Cell C961209, P8, type II. D,I(X) curves generated from data of C. The arrow indicates the size of the conditioning step. Parameters for the nonadaptedI(X) relation (circles) were OR, 2.1 μm;Imax, −141 pA;Irest, 11%;P1, 0.72;P2, 1.19;A1, 3.61;A2, 1.57. Parameters for the adaptedI(X) relation (squares) were OR, 1.8 μm;Imax, −144 pA;P1, 7.4;P2, 10.8;A1, 1.14;A2, 0.29.