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Decoding Natural Behavior from Neuroethological Embedding
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The ARCH model: a neuroevolutionary framework for behavioral execution.

Tahir Rahman1, Charles F Zorumski1, J Reid Meloy2

  • 1Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, United States.

Frontiers in Psychiatry
|October 29, 2025
PubMed
Summary
This summary is machine-generated.

Behavior emerges from multiple interacting constraints, not single causes. The ARCH × Φ model uses archetypes (A), drives (D), and culture (C) within a threshold (Φ) to computationally model behavior across domains.

Keywords:
ARCH equationarchetypesbehavioral systems neurosciencecomputational psychiatryconstraint-convergent behaviorcultural cognitionmotivational drivesneuroethology

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Area of Science:

  • Computational neuroscience
  • Behavioral science
  • Psychology

Background:

  • Behavior is understood as arising from complex, interacting factors.
  • Existing models often simplify the multifaceted nature of behavioral drivers.
  • A need exists for a unified framework integrating biological, affective, and cultural influences.

Purpose of the Study:

  • To introduce the ARCH × Φ model, a computational grammar for behavior.
  • To formalize the multiplicative interaction of Archetype (A), Drive (D), and Culture (C) modulated by a context-sensitive threshold (Φ).
  • To propose a taxonomy of ten archetypal systems (Systema Behavorum) as inputs to the model.

Main Methods:

  • Development of the ARCH × Φ computational grammar.
  • Integration of ethology, affective neuroscience, psychiatry, and cultural psychology.
  • Definition of a provisional taxonomy of ten archetypal systems.

Main Results:

  • The ARCH × Φ model specifies behavior as a probabilistic, testable outcome of convergent constraints.
  • Archetypes are reframed as conserved neural scripts modulated by scalar amplification and symbolic expression.
  • The framework supports falsifiable predictions and operational definitions.

Conclusions:

  • Behavior is an emergent property of convergent constraints across biological, affective, cultural, and contextual domains.
  • The ARCH × Φ model offers a unified approach to understanding motivation, threshold regulation, and symbolic processing.
  • This framework has potential clinical applications in decoding and treating behavioral dysregulations.