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Related Experiment Videos

The response to prism deviations in human infants.

P M Riddell1, A M Horwood, S M Houston

  • 1Baby Vision Laboratory Department of Psychology University of Reading 3 Earley Gate, Whiteknights, Reading, RG6 6AL, UK. p.m. riddell@reading.ac.uk

Current Biology : CB
|October 6, 1999
PubMed
Summary

Infants can make corrective eye movements to large prisms much earlier than previously thought, challenging existing theories on infant visual development and disparity detection.

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Area of Science:

  • Developmental Psychology
  • Neuroscience
  • Ophthalmology

Background:

  • Infants previously thought unable to correct eye movements for small prisms before 14-16 weeks.
  • Three hypotheses explained this inability: degraded sensory capacity, learning through practice, or maturational factors linked to stereopsis.

Purpose of the Study:

  • To test hypotheses on early infant visual responses to prisms.
  • To determine if infants respond to larger prisms at younger ages.

Main Methods:

  • Tested 192 infants aged 2-52 weeks with a larger prism in the dark.
  • Recorded corrective eye movements in response to prismatic deviation.

Main Results:

  • 63% of 5-8 week olds showed corrective eye movements with a larger prism.

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  • Response percentage and speed increased with infant age.
  • Infants demonstrate corrective eye movements to large prismatic deviations earlier than 14-16 weeks.
  • Conclusions:

    • Infant visual systems can process larger prismatic deviations earlier than previously believed.
    • Findings challenge existing hypotheses regarding sensory capacity, learning, and stereopsis onset.
    • Early corrective eye movements indicate a more developed visual response system in young infants.