| Summary: | referential relationships can be communicated through presupposition. The presupposition trigger (also) in Jiayan also bought eggs exerts a pragmatic constraint that besides the object, the verb constrains additional and alternative referents. Our study provided a novel set of evidence that the reader preferred larger- over smaller-sized sets for the scope of presupposition in discourse comprehension. The structural hierarchy in smaller-sized sets and the earlier-mentioned structural details in larger-sized sets drove higher preference. Furthermore, readers' difference in their preference reflected their tendency to attend to discourse structural information. These findings are consistent with the multiple constraints hypothesis/the presupposition maximization principle hypothesis, rather than the local bias hypothesis. The present study enlightened the understanding of structural constraints on processing the number and the identity of presupposed referential information in discourse reading comprehension.
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