Figure 6.

Dependence upon difference in penetration depths for VF (left) and rapid pacing (right). (a and b) Comparison of V_opt (a) and Ca_opt (b) traces obtained upon variation of the penetration depth (δ) of each signal by ${\delta }_{default}^{Vopt}$, 1.5 × ${\delta }_{default}^{Vopt}$(high), and 0.5 × ${\delta }_{default}^{Vopt}$ (low), and by ${\delta }_{default}^{Caopt}$, 1.5 × ${\delta }_{default}^{Caopt}$ (high), and 0.5 × ${\delta }_{default}^{Caopt}$ (low). (c) Variation in maximum MI between the optical (V_opt/Ca_opt) signals as the relative penetration depth (δ) of each signal is varied for all combinations of high, default, and low penetration depths.