Artificial Intelligence #artificial intelligence#multimodal
Primacy Bias in Multimodal RAG: First Retrieved Items Dominate, Study Finds
A research paper titled 'Lost at the End: Primacy Bias in Multimodal Retrieval-Augmented Question Answering' introduces a controlled probe to measure position bias in multimodal KB-VQA. The study finds a strong primacy effect, where the first retrieved passage significantly outperforms later ones, contrasting with the U-shaped 'lost-in-the-middle' pattern in text-only models. The findings call for reader-side interventions and question the adequacy of recall@k as a metric for deployed systems.
Jun 16, 2026 1 source