Figure 10

CLS cells increase their rate and noise intensity, but not jump amplitudes, when they approach threshold, and all cells maintain a steady drift function across levels. (A) Jump rate of CLS cells. Error bars show one standard deviation, assuming that the number of detected blips is Poisson. (B) Mean amplitudes of the blips. Error bars show one standard deviation, calculated from 1000 bootstrap samples of the original amplitude values. We observe a similar lack of systematic trend in the variance of the amplitudes (not shown). (C) Noise intensity for all cells. Error bars show one standard deviation, calculated from 1000 bootstrap samples of the original data increments. (D) Local slope of the drift function, as determined from a linear fit over a \({\pm}2~\mbox{mV}\) range around the stable fixed point. Error bars are too small to see on this scale, but are calculated as 95% confidence interval of the slope parameter of the linear least square fit