Journal
CHILD DEVELOPMENT
Volume 83, Issue 6, Pages 1978-1995Publisher
WILEY
DOI: 10.1111/j.1467-8624.2012.01824.x
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Funding
- NICHD NIH HHS [HD-021104, R01 HD021104] Funding Source: Medline
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The present research used a preferential-reaching task to examine whether 9- and 11-month-olds (n = 144) could infer the relative weights of two objects resting on a soft, compressible platform. Experiment 1 established that infants reached preferentially for the lighter of 2 boxes. In Experiments 2-4, infants saw 2 boxes identical except in weight resting on a cotton wool platform. Infants reached prospectively for the lighter box, but only when their initial exploratory activities provided critical information. At 11 months, infants succeeded as long as they first determined that the platform was compressible; at 9 months, infants succeeded only if they also explored the boxes and thus had advance knowledge that they differed in weight.
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