Toddlers' applications of fast-mapping generate the linguistic errors called

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Fast-mapping is the ability of toddlers to quickly learn and remember new words after just one exposure. However, their application of fast-mapping can lead to linguistic errors called underextensions and overextensions. Underextensions occur when toddlers apply newly learned words too narrowly, only to specific objects or situations, while overextensions occur when they apply newly learned words too broadly, using them to refer to a wider category of objects than is appropriate.

Toddlers' Applications of Fast-Mapping Generate the Linguistic Errors Called