Λ⁵: The Fifth-Order Plasticity Window – A Symphony of Resonance in Adaptive Systems

Λ⁵ defines the fifth-order plasticity window within the Systemic Resonance Model (SRM), uniting semantic, energetic, temporal, contextual, and ethical coherence into a single adaptive grammar. It operationalizes the Entropic-Resonance-Continuum (ERC) from neural unbinding to social re-binding and introduces Empathic Responsivity (E_res) as a dynamic ethical damper that prevents resonance overshoot in adaptive systems. Integrating the REBUS model (Carhart-Harris & Friston, 2019), psychedelic integration theory (Vollenweider, 2020), Active Inference (Friston, 2023), and resonance sociology (Rosa, 2019), Λ⁵ bridges chaos and coherence. Proof-of-concept simulations in LeRobot v0.4.0 and hardware implementations on Reachy 2 demonstrate ethical co-adaptation through HRV-based empathic feedback, offering a blueprint for resonant, human-centered AI and robotics.