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Related Experiment Videos

Development of sensitivity to pictorial depth.

A Yonas, W T Cleaves, L Pettersen

    Science (New York, N.Y.)
    |April 7, 1978
    PubMed
    Summary

    Infants develop sensitivity to pictorial depth cues around 22-26 weeks. Older infants (26-30 weeks) use pictorial depth cues, while younger infants (20-22 weeks) rely on real depth cues for reaching.

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    Area of Science:

    • Developmental psychology
    • Visual perception
    • Infant cognition

    Background:

    • Depth perception is crucial for navigating the environment.
    • Understanding how infants perceive depth from static images is key to cognitive development research.
    • Previous research indicates varying reliance on different depth cues at different ages.

    Purpose of the Study:

    • To investigate the age at which infants become sensitive to pictorial depth information.
    • To determine if infants can use static pictorial cues for visually guided reaching.
    • To compare infant responses to pictorial depth versus real depth cues.

    Main Methods:

    • Infants aged 20-30 weeks were tested.
    • Participants reached for objects presented in photographic displays and real-world setups.
    • Conflicting binocular and surface-texture information was minimized in pictorial stimuli.

    Main Results:

    • Infants aged 26-30 weeks reached towards the apparently closer side of a rotated window photograph.
    • Younger infants (20-22 weeks) did not reach towards the pictorial depth cue.
    • Younger infants did, however, reach accurately to a real rotated window, showing sensitivity to actual depth.

    Conclusions:

    • Sensitivity to static pictorial depth information emerges between 22 and 26 weeks of age.
    • Infants younger than 26 weeks do not reliably use pictorial cues for reaching.
    • By 26 weeks, infants can utilize static pictorial cues, indicating a significant developmental milestone in visual perception.

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