FIG. 9.

Spatiotemporal Ca and action potential duration (APD) dynamics in the coupled map lattice (CML) model for $\gamma >0$. (a) Stability boundary in the ${\tau }_a-\beta$ plane for $k=0$ (or a single cell). (b) $\mathrm{\Delta }a$ and $\mathrm{\Delta }c$ vs cell no. recorded from beat no. 999 and no. 1000 with a single node. (c) Same as (b) but with multiple nodes. (d) $\mathrm{\Delta }a$ and $\mathrm{\Delta }c$ vs $n$ with a random initial condition. (e) Same as (d) but with a weaker coupling, ${\sigma }_R=0.3$. (f) $S_{vc}$ vs ${\sigma }_R$. 20 different random initial conditions are used for each ${\sigma }_R$. (g) $S_{vc}$ vs $T.20$ random initial conditions are used for each $T$. Arrows mark the $T$ for the transition between desynchronized and synchronized SDA patterns. In (f) and (g), the cases of $S_{vc}=1$ correspond to SCA. (h) $a$ and $c$ vs $T$ for a single cell. The default parameters are $T=270\text{ms},{\tau }_a=40,\beta =4,\gamma =0.002$, and ${\sigma }_R=0.4$.