A Universal Vibe? Finding and Controlling Language-Agnostic Informal Register with SAEs

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• Multilingual language models process informal register as a portable, language-agnostic pragmatic abstraction.result 95%
• A novel cross-lingual dataset with polysemous target terms was introduced to isolate pragmatic register processing from lexical sensitivity.method 95%
• A small but robust cross-linguistic core of informal register signal emerges in the internal representations of Gemma-2-9B-IT.result 90%
• The identified shared representations of informal register form a geometrically coherent subspace that sharpens in deeper layers of the model.result 90%
• Activation steering with the identified cross-linguistic features causally shifts output formality across multiple languages.result 95%
• The identified cross-linguistic features for informal register generalize zero-shot to six unseen languages.result 95%
• Whether the identified informal register subspace generalizes to other model architectures or scale regimes remains an open question.limitation 85%

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