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The phase diagram of the coupled sine circle map lattice showsspatio-temporal intermittency of two distinct types: spatio-temporalintermittency of the directed percolation (DP) class, and spatial intermittencywhich does not belong to this class. These two types of behaviour are seen tobe special cases of the spreading and non-spreading regimes seen in the system.In the spreading regime, each site can infect its neighbours permitting aninitial disturbance to spread, whereas in the non-spreading regime no infectionis possible. The two regimes are separated by a line which we call theinfection line. The coupled map lattice can be mapped on to an equivalentcellular automaton which shows a transition from a probabilistic cellularautomaton (PCA) to a deterministic cellular automaton (DCA) at the infectionline. Thus the existence of the DP and non-DP universality classes in the samesystem is signalled by the PCA to DCA transition. We also discuss the dynamicorigin of this transition.

A cellular automaton identification of the universality classes of spatiotemporal intermittency