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Complex dynamics of a localized target pattern in electrohydrodynamic convection.

A two-dimensional cellular pattern (lattice) created by electrohydrodynamic convection of a nematic liquid crystal exhibits limit cycle oscillations. We found a localized target pattern of wave fronts emitted from a self-organized oscillating center. The localized structure has a life cycle: it arises from a uniform state, grows, and collapses from nucleating defects at its center. This phenomenon is caused by an interaction between the waves and deformations of the underlying lattice, and is different from that in localized traveling waves