Transition from a sequential ( ε
= 1) to a Hill-like ( ε
= 0) activation mechanism. The solid line (Turing-Hopf (TH) bifurcation) separates wave patterns (grey shaded area) from stationary Turing patterns (white area above the TH curve). The dashed line (AS) indicates the transition from inward (dark grey) to outward (light grey) propagating waves where c1 - c3 = 0. The dash-dotted line marks the Benjamin-Feir (BF) instability and the occurrence of spatio-temporal chaos nearby. Other parameters: ν = 0.5, q = 1.