English: Correlated dynamics of actin/fascin/myosin networks. Active actin networks exhibit dynamic reorganizations (arrows indicate the movement of individual points in the network averaged over three frames. Lengths of the arrows are 20-fold magnified). The long range reorganizations show collective phases (velocity arrows are shown in green) during which the majority of the structures move simultaneously. The collectivity in the network is measured by the average squared velocity cross correlation function . Here, phases of collective movement are reflected as peaks above 0.15 (solid black line).