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Related Experiment Videos

Infants' perception of depth from cast shadows.

Albert Yonas1, Carl E Granrud

  • 1University of Minnesota, Minneapolis, Minnesota, USA. yonas@umn.edu

Perception & Psychophysics
|April 19, 2006
PubMed
Summary

Seven-month-old infants use cast shadows for depth perception, reaching for nearer objects. Five-month-olds show no shadow-based depth perception, indicating this ability develops between 5 and 7 months.

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Area of Science:

  • Developmental psychology
  • Visual perception

Background:

  • Infant depth perception is crucial for interacting with the environment.
  • The role of specific visual cues, like cast shadows, in early depth perception is not fully understood.

Purpose of the Study:

  • To investigate the development of depth perception in infants using cast shadows as a monocular depth cue.
  • To determine the age at which infants become sensitive to cast shadows for depth information.

Main Methods:

  • Five- and 7-month-old infants were presented with visual displays where cast shadows indicated object distance.
  • Reaching behaviors towards apparently nearer objects were recorded under monocular and binocular viewing conditions.
  • A second experiment confirmed motor capabilities in 5-month-olds using a different depth cue.

Main Results:

  • Seven-month-olds demonstrated preferential reaching for the nearer object based on cast shadows under monocular viewing.
  • Five-month-olds did not show a reaching preference based on cast shadows.
  • Five-month-olds exhibited reaching preferences when distance was clearly defined, confirming their motor abilities.

Conclusions:

  • Depth perception based on cast shadows emerges between 5 and 7 months of age.
  • Seven-month-old infants utilize cast shadows as a reliable source of depth information.
  • This study provides evidence for the developmental timeline of processing specific pictorial depth cues in infancy.

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