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Related Experiment Videos

The drawbridge phenomenon: representational reasoning or perceptual preference?

S M Rivera1, A Wakeley, J Langer

  • 1Department of Psychology, University of California, Berkeley, USA. srivera@shriver.org

Developmental Psychology
|March 19, 1999
PubMed
Summary

Infants prefer looking at more motion, not impossible events. Longer looking times at rotating drawbridges are due to perceptual preference, not reasoning about causality or object permanence.

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Area of Science:

  • Developmental Psychology
  • Cognitive Science
  • Infant Perception

Background:

  • Previous research suggested infants possess an understanding of physical laws and object permanence.
  • Studies claimed infants look longer at impossible events, indicating reasoning about causality.

Purpose of the Study:

  • To investigate if infants' longer looking times at a rotating drawbridge are due to understanding physical impossibility or perceptual preference.
  • To re-examine claims about infants' representational reasoning regarding object permanence events.

Main Methods:

  • Two experiments used a habituation paradigm with infants.
  • Stimuli included a rotating drawbridge appearing to violate physical laws (180-degree rotation with obstruction) versus a possible event (112-degree rotation).

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Main Results:

  • Infants looked longer at 180-degree rotations regardless of whether the event appeared possible or impossible.
  • No significant difference in effect size was found between experiments with and without an obstruction.

Conclusions:

  • Infants' longer looking at 180-degree rotations is likely due to a perceptual preference for greater motion.
  • The findings challenge the interpretation that longer looking reflects infants' representational reasoning about physically impossible object permanence scenarios.