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- W63886226 abstract "Attentional Biases in Artificial Noun Learning Tasks: Generalizations Across the Structure of Already-Learned Nouns Larissa K. Samuelson (samuelso@indiana.edu) Department of Psychology and Program in Cognitive Science Indiana University Bloomington, IN 47405 Abstract Even though learning noun meanings in a first language should be a difficult task young children learn nouns quickly and often with little effort. Previous research suggests that the task of learning words in made easier by constraints or biases that reduce the problem of finding the correct word-referent mapping to a solvable size. The research presented here examines the relation between the attentional biases young children demonstrate in laboratory noun learning tasks and the pattern of word learning seen outside the laboratory. The comparison suggests that attentional biases in laboratory noun learning tasks are a generalization across the nouns young children have already learned. Further, changing the nouns young children know changes not only the attentional biases they demonstrate in the laboratory, but also their vocabulary development outside the laboratory. Introduction Young children typically say their first word at 1-year-of- age. However, conservative estimates suggest that by 5- years-of-age children have as many as 10,000 words in their productive vocabulary. How do children learn so many words so fast? One suggestion is that the task of learning words is made easier by biases or constraints which reduce the problem of finding the correct word-referent mapping to a solvable size (e.g. Landau, Smith, & Jones, 1988; Markman, 1992; Soja, Carey, & Spelke, 1991). There is strong experimental evidence for the existence of a number of these word learning biases. The research presented here concentrates on two: the shape bias for learning names of solid objects and the material bias for learning names of non solid substances. Evidence for these two attentional biases comes from artificial noun learning experiments. In these experiments, a young child is presented with a novel object. This exemplar object is then named, i.e. “this is a dax”. The child is then presented with novel test objects that match the exemplar in one perceptual dimension, for example in shape only, color only, or material only. The child is then asked which of these test objects can be called by the same name as the exemplar. Numerous studies have shown that when the exemplar object is made of a solid, rigid material such as wood or hardened clay, children 24-months-of-age and older generalize novel names to other objects that match the exemplar in shape. This “shape-bias” has been demonstrated in numerous laboratories, with stimuli ranging from real, 3-dimensional objects specially constructed for the experiment (Imai & Gentner, 1997; Landau, et al., 1988), to pictures of familiar objects (Imai, Gentner, & Uchida, 1994). However, when the exemplar object is made from a non solid substance such as hair gel or face cream, children generalize the novel name to test objects made from the same material as the exemplar (Dickinson, 1988; Soja, 1992; Soja, et al., 1991). This “material-bias” has also been demonstrated in numerous studies and laboratories, however this bias does not appear to be robust until after 30-months-of-age (Samuelson & Smith, 1999). In a series of recent studies, I have examined the relation between these attentional biases, demonstrated in laboratory tasks, and the pattern of noun vocabulary growth seen outside the laboratory (Samuelson & Smith, 1999). These experiments suggest that the attentional biases seen in laboratory word learning tasks may be generalizations across the category structure of already learned nouns. This paper reviews these findings and the suggested hypothesis. Two experiments testing this hypothesis are then presented. The results show that changing the nouns young children know changes the development of attentional biases seen in laboratory word learning tasks, and that this change further alters the trajectory of vocabulary development outside the laboratory Attentional Biases and the Nouns Children Know If the shape and material biases are to help children learn nouns, then these biases need to match the kinds of nouns that young children learn early. That is, if the shape bias helps children learn names for solid objects by directing their attention to with-in category similarity in shape, then many" @default.
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- W63886226 title "Attentional Biases in Artificial Noun Learning Tasks: Generalizations Across the Structure of Already-Learned Nouns" @default.
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