June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Perception of 3-D shape from moving cast shadow in human infants
Author Affiliations
  • Tomoko Imura
    Department of Psychology, Kwansei Gakuin University
  • Masami K. Yamaguchi
    Department of Psychology, Chuo University
  • So Kanazawa
    Department of Psychology, Shukutoku University
  • Nobu Shirai
    Department of Psychology, Chuo University
  • Yumiko Otsuka
    Department of Psychology, Chuo University
  • Masaki Tomonaga
    Primate Research Institute, Kyoto University
  • Akihiro Yagi
    Department of Psychology, Kwansei Gakuin University
Journal of Vision June 2006, Vol.6, 376. doi:10.1167/6.6.376
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      Tomoko Imura, Masami K. Yamaguchi, So Kanazawa, Nobu Shirai, Yumiko Otsuka, Masaki Tomonaga, Akihiro Yagi; Perception of 3-D shape from moving cast shadow in human infants. Journal of Vision 2006;6(6):376. doi: 10.1167/6.6.376.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Motion of cast shadow improves the perception of motion trajectory of the objects (Kersten, Mamassian, & Knill, 1997). Our previous studies showed that moving cast shadow was also effective for 6- and 7-month-old infants to perceive the spatial layout of objects (Imura et al., 2005), however, there are no developmental studies about 3-D shape perception from moving cast shadow. The present study attempted to examine whether infants aged from 4- to 7-month-old discriminate between two 3-D objects' shapes from moving cast shadows using habituation-dishabituation procedure. While an expanding ellipse without a cast shadow is perceived as no rigid and ambiguous for adult observers, manipulating the motion and shape of cast shadows occur two different three-dimensional impressions of objects although the their shapes are identical: one is raising “capsule”, and the other is expanding objects like “gum”. During habituation phase, infants were presented two identical expanding objects without shadows side by side, and then they were tested “capsule” and “gum”. If infants perceive the expanding objects as no rigid objects, they will prefer to look more the “capsule”, containing novel 3-D objects, than “gum” during test. The 6- and 7-month-old, but not the 4-and 5-month-old, infants looked significantly longer “capsule” than “gum”. These findings suggest that 6- and 7-month-old infants discriminate between two objects' shapes during test. These results revealed that depth perception from cast shadow develops around 6 months, and it is consistent with other pictorial depth cues.

Imura, T. Yamaguchi, M. K. Kanazawa, S. Shirai, N. Otsuka, Y. Tomonaga, M. Yagi, A. (2006). Perception of 3-D shape from moving cast shadow in human infants [Abstract]. Journal of Vision, 6(6):376, 376a, http://journalofvision.org/6/6/376/, doi:10.1167/6.6.376. [CrossRef]
Footnotes
 This research and the current presentation was financially supported by the Grant-in-Aids for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (no. 12002009, 15500172, 16002001, 16300084), and the Cooperative Research Program of the Primate Research Institute, Kyoto University to Tomoko Imura.
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