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=== Vicsek Models === An early model from the domain of physics, the Vicsek model <ref>{{Citation | last=Vicsek, T. | last2=Czirok, A. | last3=Ben-Jacob, E. | last4=Cohen, Inon | last5=Shochet, O | year=1995 | title=Novel Type of Phase Transition in a System of Self-Driven Particles | publisher=Physical Review Letters | volume=75 | issue=6 | pages=1226β1229 }}</ref> gained attention in the study of flocking as a form active matter, a system where energy is continually added (unlike thermodynamic models). Applied to collective motion and swarming, Vicsek models demonstrate that a simpler set of rules with just fixed speed, self-propelled particles, and neighbor alignment, are able to achieve sub-group flocking and milling (vortex structures). These models are attractive in physics due to their simplicity and universality. Such models however, do not exhibit speed changes due to climbing and diving in flight, or complex phenomena such as orientation waves due to perceptual vision.
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