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Considerable stability of the meanings associated with concrete nouns is arguably important for their effective use. On the other hand, variability is observed across time, individuals, and communicative contexts. This study examined the balance between stability and flexibility in meanings of common, basic level artifact nouns by evaluating speaker differences in their use as a function of age, education, and gender. Diverse samples of monolingual Dutch- (N ≈ 400) and French-speaking (N ≈ 300) Belgian adults made lexical category judgments for pictures of storage containers. Mixture IRT-analyses revealed the presence of latent groups of categorizers related to age but not gender or education in each language. In both languages, older adults relied more on traditional materials such as glass or cardboard in their judgments, whereas younger adults emphasized relatively new materials such as plastics. This generational difference demonstrates how elements of word meaning can shift over the short-term, linking individual to larger scale variation and providing the foundation for meaning evolution over time. [ABSTRACT FROM AUTHOR]

Semantic categories in the world's languages often reflect a historical process of chaining: A name for one referent is extended to a conceptually related referent, and from there on to other referents, producing a chain of exemplars that all bear the same name. The beginning and end points of such a chain might in principle be rather dissimilar. There is also evidence supporting a contrasting picture: Languages tend to support efficient, informative communication, often through semantic categories in which all exemplars are similar. Here, we explore this tension through computational analyses of existing cross-language naming and sorting data from the domain of household containers. We find (a) formal evidence for historical semantic chaining, and (b) evidence that systems of categories in this domain nonetheless support near-optimally efficient communication. Our results demonstrate that semantic chaining is compatible with efficient communication, and they suggest that chaining may be constrained by the functional need for efficient communication. [ABSTRACT FROM AUTHOR]