arXiv: cs.AI preprintsInternational6 November 2026
The Intrusion Pathway: How Non-Evidential Context Degrades Language Model Performance
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arXiv:2611.07778v1 Announce Type: new Abstract: Language models lose accuracy when a prompt contains non-evidential context: irrelevant statements from unrelated domains, or random off-distribution tokens, with no competing answer and no semantic overlap with the query. Such noise pervades retrieval-augmented, tool-using, and long-context deployments, yet the failure has lacked a mechanistic account. We trace the corruption to the Intrusion Pathway, which starts with MLPs enriching both query-subject and irrelevant-token representations, parroting heads carry prefix-token content to the predic
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