Fig. 14.
Dependence of g on l/‖v‖ (same preparation as in Figs. 12, 13).A, Value of the half-activation parameter x1/2 and the slope a for 10 different values of l/‖v‖. The points taken from leftto right correspond to values of l/‖v‖ from 50 to 5 msec, respectively. Note the decrease in the slope parameter and the shift in half-activation as l/‖v‖ decreases. This is illustrated in the inset, which shows the 10 different sigmoids corresponding to the parameters shown in themain panel (a = 0; b = 209 Hz; see Eq.4). B, Hysteresis parameter as a function of l/‖v‖ (a is the asymptotic value of the firing rate as z becomes small; see Eq. 4).