Figure 19.

Computer simulation of entrainment without fusion. Panel A: activation during a paced beat entraining the reentrant rhythm, as seen in Video 2. The format is similar to that in Figure 4A. Panel B: activation of the same preparation by a paced wavefront generated at the same site as in panel A, but in the absence of reentry, as seen in Video 3. Please note that activation is identical except for the tissue in between the two anatomical barriers (the protected area), that during entrainment is activated from right to left with collision between the n – 1 wavefront and the n wavefront, and this is not the case in panel B.