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arXiv · 2607.12686

Segregate, Refine, Integrate: Decomposing Multimodal Fusion for Sentiment Analysis

Alexios Filippakopoulos·Elias Kallioras·Nikolaos Xiros·Efthymios Georgiou·Alexandros Potamianos
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Abstract

Multimodal fusion must simultaneously refine modality-specific signals and model cross-modal interactions; two competing objectives typically entangled within the same operation. We propose \textbf{SeRIn} (\textbf{Se}gregate, \textbf{R}efine, \textbf{In}tegrate), a multimodal LM fusion scheme that enforces this separation as an architectural prior. Modality-specific representations evolve along isolated pathways, each refined against its respective encoder context, while a dedicated cross-modal pathway accumulates their joint evolution without contaminating unimodal streams. Full cross-modal interaction is deferred to a final prediction step - ablations confirm that structured interactions, not added capacity, drive the gains; gate analysis under visual corruption reveals emergent modality reweighting without explicit supervision. SeRIn achieves state-of-the-art results on CH-SIMS and CMU-MOSEI, improving all metrics on both benchmarks.

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Alexios Filippakopoulos, Elias Kallioras, Nikolaos Xiros, Efthymios Georgiou, Alexandros Potamianos. 2026-07-14. Segregate, Refine, Integrate: Decomposing Multimodal Fusion for Sentiment Analysis. https://arxiv.org/abs/2607.12686

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