Christos Zacharopoulos
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Notes on clinical AI, neuroscience, language models, and medical-device research.

18 August 2026

In Machina N400: Pinpointing Where a Causal Language Model Detects Semantic Violations

How Phi-2 reacts when a sentence ends with an impossible word, and what its internal geometry reveals about semantic violations.

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Christos Zacharopoulos · christonik@gmail.com

© 2026 · Based in Paris, France