The Composite NPF Index (CNI) extends the Neural Pathway Fallacy to belief networks, quantifying systemic epistemic risk. This paper presents the CNI formula (weighted sum with normalised weights), normalisation methods (linear, sigmoid with cultural parametrisation), sampling adequacy, and a gradient‑descent weight update (hypothesis). It introduces the neurodiversity provision (autistic resistance to high‑SE NPFs) and positions CNI within the Fractal Entailment Network (FEN

The Neural Pathway Fallacy (NPF) is a formal neurocognitive hypothesis: repeated poor reasoning habits physically entrench flawed neural circuits. This paper presents the NPF formula (six cognitive factors, logarithmic time/exposure modifiers), its neurobiological grounding, and a threshold‑based intervention framework. It positions NPF within the ESA architecture and includes a falsifiability box.