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Phase transitions from individual to collective response through a QS mechanism, as described by Vp(φ). Here, the state of the system is described by a global field φ that is proportional to the system's activity. Here, we have fixed μ = 1, θ = 0.25 and δ = 1 (thus ρc = 0.5) and different values of ρ are used: ρ = 0.25, 0.5, 0.75.
