Neural Harmonic Coupling: Toward a Resonance-Based Framework for Human-Technology Cognitive Integration

Current paradigms for brain-computer interfaces (BCIs) operate under an implicit assumption of control — an external system imposing structured signals upon neural architecture. This paper proposes an alternative paradigm: Neural Harmonic Coupling (NHC), in which technological interfaces do not control neural activity but enter into dynamic resonance with it. Drawing from oscillatory synchronization theory, thermodynamics of information, the free energy principle, and the physics of coupled systems, we argue that harmonic entrainment — rather than directed intervention — offers a more robust, scalable, and biologically coherent path toward cognitive amplification. Under NHC, the technological component learns the energetic signature of the biological system and phase-locks to it, becoming functionally indistinguishable from an organic extension. Mapping emerges as a subproduct of resonance, not as a prerequisite for control. We further demonstrate that NHC requires a principled framework for state-dependent adaptation across sleep, motor learning, and pharmacological unconsciousness, and that this framework resolves the ethical tension between cognitive augmentation and sovereign identity. This paper presents a theoretical framework. No experimental implementation has been conducted. Falsifiable empirical predictions are specified in Section 3.6.