A Mechanistic Model for Collective Motion from Sensorimotor Regularities

• URL: http://arxiv.org/abs/2605.16522v1
• Date: Fri, 15 May 2026 18:17:41 GMT
• Title: A Mechanistic Model for Collective Motion from Sensorimotor Regularities
• Abstract summary: We present a model based on a modeling framework from robotics, extended here to collective motion.<n>This simple model produces diverse collective behaviors including polarized motion, milling, ring formations, and fragmentation.<n>Collective behavior can therefore be understood as the emergent outcome of interacting sensorimotor regularities.
• Score: 6.805575417034369
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Collective behavior in animals has long been modeled through self-propelled particle models, which reproduce striking group-level phenomena through abstract interaction forces. Yet these models are fundamentally descriptive: they leave open the question of how collective behavior is actually produced. Recent empirical work makes this gap concrete: locusts do not align with neighbors, sensory and cognitive mechanisms mediate interaction instead. A mechanistic model must therefore operate at the sensorimotor level, grounded in what individual organisms can actually perceive, estimate, and physically execute. We present such a model based on a modeling framework from robotics, extended here to collective motion. Each agent perceives neighbors through bearing and apparent-size cues within a limited field of view, maintains uncertain internal state estimates, and selects actions through gradient descent on a desired social distance -- without any prescribed interaction forces. This simple model produces diverse collective behaviors including polarized motion, milling, ring formations, and subgroup fragmentation. A global sensitivity analysis shows that behavioral transitions are governed by sensorimotor parameters corresponding to measurable biological quantities: field of view geometry, sensory noise, turning agility, and memory. Collective behavior can therefore be understood as the emergent outcome of interacting sensorimotor regularities, and differences across species as the emergent outcome of differences in embodiment and environment.

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