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Morteza Dehghani

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#natural language process... Preprint Sep 2026

Cognitive Expert Language Models Better Align with the Corresponding Brain Systems

Large language models (LLMs) can predict human brain activity across a variety of brain regions during natural language comprehension. Typically, however, LLM-brain alignment is measured using one model for different regions of the brain, and then model performance is summarized across regions. This one-model-fits-all...

Zhivar Sourati, Meng-Hong Wu, Nona Ghazizadeh et al. · 0 citations

Personalized Group Relative Policy Optimization for Heterogenous Preference Alignment

Personalized GRPO is introduced, a novel alignment framework that decouples advantage estimation from immediate batch statistics and achieves faster convergence and higher rewards than standard GRPO, thereby enhancing its ability to recover and align with heterogeneous preference signals.

Jialu Wang, Heinrich Peters, A. Butt et al. · 1 citation

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