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We studied English-learning children’s ability to learn the meanings of novel words from sentences containing truth-functional negation (Exp1) and to use the semantics of negation to inform word meaning (Exp2). In Exp1, 22-month-olds (n = 21) heard dialogues introducing a novel verb in either negative-transitive (“ Mary didn’t blick the baby ”) or negative-intransitive (“ Mary didn’t blick ”) sentences. When then asked to “Find blicking!” while viewing two-participant versus one-participant actions, children who heard negative-transitive sentences looked longer at the two-participant event than children who heard negative-intransitives. Thus, the mere presence of negation does not disrupt sentence processing and word learning in young children. Experiment 2 tested whether 2-to-4-year-olds (n = 20) use the semantics of negation to restrict the meaning of novel nouns when categorizing objects varying along a perceptual continuum (from 10 to 90% exemplars). Children initially heard “ These are blickets ” paired with certain exemplars (e.g., yellowish creatures, exemplars 10 and 30%). They then saw additional exemplars (e.g., pinkish creatures, 70 and 90%) while hearing either “ These are not blickets ” (negative condition) or “ These are also blickets ” (affirmative condition). At test, when seeing two novel exemplars from the continuum (e.g., creatures 20 and 80%) and asked to find “a blicket,” children in the negative condition selected the exemplar from the bottom of the continuum (i.e., the 20%) more often than children in the affirmative condition. Thus, English-learning children as young as 22-months of age correctly parse negative sentences and 2-to-4-year-olds can use negation to understand the boundaries of a word’s meaning.

English-learning preschoolers can correctly parse and interpret negative sentences to guide their interpretations of novel noun and verb meanings