Five-month-old infants have different expectations for solids and liquids

Research article

Susan J Hespos, Alissa L. Ferry, Lance Rips

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Many studies have established that 2-month-old infants have knowledge of solid objects' basic physical properties. Evidence about infants' understanding of nonsolid substances, however, is relatively sparse and equivocal. We present two experiments demonstrating that 5-month-old infants have distinct expectations for how solids and liquids behave. Experiment 1 showed that infants use the motion cues from the surface of a contained liquid or solid to predict whether it will pour or tumble from a cup if the cup is upended. Experiment 2 extended these findings to show that motion cues lead to distinct expectations about whether a new object will pass through or remain on top of a substance. Together, these experiments demonstrate that 5-month-old infants are able to use movement cues and solidity to discriminate a liquid from an object of similar appearance, providing the earliest evidence that infants can reason about nonsolid substances.

Original languageEnglish (US)
Pages (from-to)603-611
Number of pages9
JournalPsychological Science
Volume20
Issue number5
DOIs
StatePublished - May 1 2009

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Five-month-old infants have different expectations for solids and liquids : Research article. / Hespos, Susan J; Ferry, Alissa L.; Rips, Lance.

In: Psychological Science, Vol. 20, No. 5, 01.05.2009, p. 603-611.

Research output: Contribution to journalArticle

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