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Discrepancy between parental reports of infants' receptive vocabulary and infants' behaviour in a preferential looking task*


Two experiments are described which explore the relationship between parental reports of infants' receptive vocabularies at 1 ; 6 (Experiment 1a) or 1 ; 3, 1 ; 6 and 1 ; 9 (Experiment 1b) and the comprehension infants demonstrated in a preferential looking task. The instrument used was the Oxford CDI, a British English adaptation of the MacArthur-Bates CDI (Words & Gestures). Infants were shown pairs of images of familiar objects, either both name-known or both name-unknown according to their parent's responses on the CDI. At all ages, and on both name-known and name-unknown trials, preference for the target image increased significantly from baseline when infants heard the target's label. This discrepancy suggests that parental report underestimates infants' word knowledge.

Corresponding author
Address for correspondence: Dr Carmel Houston-Price, School of Psychology, University of Reading, Earley Gate, Whiteknights, Reading, RG6 6AL, UK. Email: Tel: 0118 378 5378. Fax: 0118 9316715.
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Journal of Child Language
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