Nervous System Intelligence (NSI) is introduced here as a state-based regulatory architecture for safe human functioning under load. Rather than proposing new biology, NSI organises established evidence from polyvagal neuroscience, systems theory and safety-critical engineering, defining how a nervous system recovers from perturbation and when it is safe to proceed.

This Version 1.0 paper is released under academic reference licence as the foundation for the forthcoming NSI Standard — spanning clinical, organisational and AI-mediated decision environments where human state integrity cannot be left to chance.

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