Figure 4. The stationary gain and the coefficient of variation decreased similarly when the decay time constant of the artificial AHP was increased.

A, I–f curves in control condition (•), and when adding an artificial AHP conductance ($G_{\text{dc}}^{\max }$ = 0.4 μS) with a decay time constant of 30 ms (□) or 50 ms (▴). The curves obtained for time constants of 23, 40 and 80 ms are not shown. Data points indicate the mean frequency of the stationary discharge and vertical bars show the standard deviation. The oblique lines are the best linear fits of the I–f curves, computed with the least squares method. B, stationary gain (▪) and coefficient of variation for I = 4 nA (▵) plotted against the inverse of the decay time constant. Numbers next to the data points indicate the time constant. The oblique line is the best linear fit for the stationary gain. CP motoneurone of slow type.