Figure 3.

Information carried by calcium dynamics of fibroblast cells in response to ATP, for a given memory capacity, n. (A and B) Vectorial mutual information, $M{I}_{\text{v}}$, as a function of sampling start time, $t_{\text{s}}$, at different sampling rates, r (color bar) for (A) $n=2$ and (B) $n=4$. The black curve is the scalar mutual information, $M{I}_{\text{s}}$, at each time point. (C) $M{I}_{\text{v}}$ as a function of n at fixed sampling rate $r=1/30$ Hz and sampling start time (black curve, $t_s=0$; red curve, $t_{\text{s}}=40$ s). $n=$ 1 corresponds to $M{I}_{\text{s}}$. (D) Maximal $M{I}_{\text{v}}$ over all $t_{\text{s}}$ values as a function of r for fixed memory capacity (red, $n=2$; blue, $n=4$). Error bars in (A)–(D) represent the mean ± SD of 100 bootstraps. To see this figure in color, go online.