Positional Cognitive Specialization: Where Do LLMs Learn To Comprehend and Speak Your Language?

ArXi:2604.00923v1 Announce Type: new Adapting large language models (LLMs) to new languages is an expensive and opaque process. Understanding how language models acquire new languages and multilingual abilities is key to achieve efficient adaptation. Prior work on multilingual interpretability research focuses primarily on how trained models process multilingual instructions, leaving unexplored the mechanisms through which they acquire new languages during