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Numerical simulation of light-driven collective motion inspired by experimental observations.

A Eddakoun1, A Hader2,3, I Tarras3

  • 1Interdisciplinary Laboratory of Fundamental and Applied Sciences (LISFA), Higher Normal School of Casablanca University of Hassan II, Casablanca, Morocco.

Chaos (Woodbury, N.Y.)
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Fish schools exhibit collective motion changes in response to light. This study models fish behavior, revealing a light-induced phase transition from disordered to ordered movement, crucial for understanding biological swarms.

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Area of Science:

  • Collective behavior dynamics
  • Biophysics
  • Swarm intelligence

Background:

  • External stimuli significantly influence collective motion in biological systems.
  • Understanding fish school responses to dynamic cues is key for ecological and robotic applications.
  • Previous experimental work at Université Paris Cité observed fish reacting to moving light.

Purpose of the Study:

  • To develop a numerical model simulating fish school collective motion in response to a moving luminous stimulus.
  • To replicate and analyze the dynamics observed in experimental studies.
  • To investigate the mechanisms behind light-induced collective behavior transitions.

Main Methods:

  • Agent-based modeling with particles exhibiting attraction to a light source and mutual repulsion.
  • Incorporation of stochastic fluctuations influenced by light intensity.
  • Simulation of dynamic illuminance changes over time.
  • Analysis of particle polarization and average speed.

Main Results:

  • The model successfully reproduced key experimental findings, including transitions from disordered to ordered motion.
  • Simulations showed the formation of cohesive groups and high polarization under strong light.
  • Analysis confirmed a light-induced phase transition in collective behavior.
  • Results demonstrated strong agreement with experimental data.

Conclusions:

  • The developed numerical model accurately captures collective fish behavior in response to dynamic luminous stimuli.
  • Light intensity acts as a critical factor driving phase transitions in collective motion.
  • The study provides valuable insights into the mechanisms governing how biological swarms respond to environmental cues.