Carlo R. Laing/Massey University
A chimera state in a network of two populations of Winfree oscillators (populations labeled 1–500 and 501–1000). In such a state, one population of oscillators (501–1000) synchronizes while the other (1–500) remains partially incoherent, despite the fact that both populations are identical. (The sine of the phase of each oscillator is color coded.) The existence of a chimera state in a network of Winfree oscillators was shown by Pazó and Montbrió  using a new model that allows the analytical study of a biologically realistic network of oscillators.