Q1. What are the contributions in this paper?
In Experiments 1 and 2, the quantity judgments of participants provided evidence that some mass nouns refer to individuals, as such. These results suggest that some mass nouns quantify over individuals, and that therefore reference to individuals does not distinguish count nouns from mass nouns. Also, the authors suggest that children learning language parse words that refer to individuals as count nouns unless given morpho-syntactic and referential evidence to the contrary, in which case object-mass nouns are acquired.