Figure 5.

Focal pattern in a simulation. (A) A snapshot of the tissue activation of a focal source located at the center of the 15 × 15 cm domain (model parameters are as in Fig. 4). Scalebar = 1 cm. (B) Isochronal map using four ΔI = 25 ms isochronal intervals and a spatial resolution of Δx = 7.5 mm (indicated by the scale bar). Four separate and spatially continuous isochronal regions can be clearly identified. (C) Isochronal map using four ΔI = 25 ms isochronal intervals and a spatial resolution of Δx = 15 mm (indicated by the scale bar). The centrifugal activation pattern can no longer be identified at this resolution. Black corresponds to grid points that were not activated in any of the four preceding isochronal intervals.