Figure 2.

Four example networks with connection matrices (CM) and TPMs, with ${\Phi }_{3.0}^{peak}$ and corresponding values for selected state-independent heuristics. Note that network #1 does not consist of a feedforward network if you consider all connections in the CM but is a feedforward network if only excitatory (yellow) connections are considered, which is consistent with ${\Phi }_{3.0}^{peak}$ = 0. Network #2 consists of a simple ring-shaped network only if excitatory connections are considered, which is consistent with ${\Phi }_{3.0}^{peak}$ = 1.