A Circuit for Plural Reference: How LLMs Represent and Retrieve Singular and Plural Entities
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Computer Science > Computation and Language
arXiv:2609.03687 (cs)
[Submitted on 3 Sep 2026]
Title:A Circuit for Plural Reference: How LLMs Represent and Retrieve Singular and Plural Entities
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Abstract:Coreference resolution is an important task in contextual reasoning. In this paper, we investigate the mechanism for representing and retrieving singular and plural entities for plural reference. We use a combination of mechanistic interpretability and attention pattern analysis to study the process in which LLMs predict a pronoun to refer back to previously mentioned entities. Using a range of causal intervention techniques, we find a set of attention heads that are responsible for (1) representing coreference information in the input, (2) identifying entities that form a plural reference, (3) transferring the information to the component that is responsible for selecting the antecedents and predicting the pronoun. We also find that LLMs align with humans in preference for plural pronoun. Specifically, entities in a plural construction are more likely to be referred to as a plural entity if they are ontologically similar and are linked by the conjunction "and".
| Subjects: | Computation and Language (cs.CL) |
| Cite as: | arXiv:2609.03687 [cs.CL] |
| (or arXiv:2609.03687v1 [cs.CL] for this version) | |
| https://doi.org/10.48550/arXiv.2609.03687
arXiv-issued DOI via DataCite (pending registration)
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View a PDF of the paper titled A Circuit for Plural Reference: How LLMs Represent and Retrieve Singular and Plural Entities, by Anh Danh and 2 other authors
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