MLLMs exhibit spatial lexical bias on multiple-choice spatial questions, traced via mechanistic tools to language-side channels rather than vision, and largely mitigated by LLM-only DPO on synthetic data.
Atabuzzaman, Ali Asgarov, and Chris Thomas
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Mechanistic Diagnostics of Spatial Lexical Bias in Multimodal Large Language Model Spatial Reasoning
MLLMs exhibit spatial lexical bias on multiple-choice spatial questions, traced via mechanistic tools to language-side channels rather than vision, and largely mitigated by LLM-only DPO on synthetic data.