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Lucie Flek

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#artificial intelligence Preprint May 2026

Detecting Hidden Behaviors in LLMs via Activation-matched Finetuning

Large language models can hide hidden behaviors that activate only under narrow conditions, such as backdoor triggers, sleeper-agent deployment cues, sandbagging, or topic-conditioned censorship. Such behaviors are difficult to detect without prior knowledge what to look for. We present activation-matched finetuning, a...

Robin Haselhorst, Lucie Flek, Florian Mai · 0 citations
#natural language process... Preprint Aug 2026

Data Attribution of Emergent Misalignment with Persona Features

Emergent misalignment (EM) is the phenomenon where fine-tuning a language model on a narrow task leads to harmful behavior in unrelated domains. A leading mechanistic account attributes EM to persona features: latent directions acquired during pre-training that misaligned fine-tuning amplifies. We ask where these featu...

C. Vetter, David Kaczér, Lucie Flek et al. · 0 citations

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