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Perception of illusory motion in 6- to 8-month old infants |
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Abstract:
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Various kinds of geometric patterns produce perceptual illusions. These geometrical illusions are one of most important stimuli to study a perception. Many previous studies of infants’ perception have used preferential looking methods (Fantz, 1963). However in traditional geometrical illusion figures such as Ponzo or Muller-Lyer figures, the amount of illusions are not enough to attract infants’ attention though the illusion is distinct phenomena. Recently, Kitaoka made new type of geometrical illusory figure (Kitaoka and Ashida, 2003; Conway et al., 2005). This stimulus called “rotating snake” was a kind of “Fraser-Wilcox illusion” (Fraser and Wilcox, 1979) which produced illusory motion by the static arrangement of regions in different colors (http://www.ritsumei.ac.jp/~akitaoka/index-j.html). The amount of illusion of “rotating snake” might be large enough to attract infants’ attention. In this study, we use this “rotating snake” as a stimulus and investigated development of perceptual illusion in infants. 32 6- to 8-month-old infants participated in this study. We prepared original “rotating snake” and control stimulus modified from the original stimulus. Rotating snake was consisted of four-color regions. In this stimulus, arrangements of regions were white, blue, black and yellow. Otherwise, in control stimulus, the arrangements of four-color regions were the combination of blue, white, blue, black regions and 2) yellow, white, yellow, black regions. At a glance, this control stimulus is very similar in appearance to the original “rotating snake.” However this stimulus does not produce illusory motion. Based on the static feature of this control stimulus, we used “rotating snake” as a target and control stimulus as a non-target. We presented the target and non-target side by side in the monitor and measured the infants’ looking time to the target. In each trial the target and non-target were presented 15 seconds and four trials were conducted for each infant. We calculated the ratio of looking time to the target. Results showed that infants looked target “rotating snake” significantlly longer (62.4 %). The difference between target and non-target was just local order of four-color regions. Other stimulus parameters, such as stimulus size or total luminance of the stimuli in non-target were same as those in target. These results suggest that 6- to 8 month-old infants perceive the illusory motion produce by the specific arrangement of four-color regions. We might explain this results by the developmental integration of motion and figure processing in 6- to 8-month-old infants. |
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Association:
Name: XVth Biennial International Conference on Infant Studies
URL: http://www.isisweb.org
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Citation:
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MLA Citation:
| Kanazawa, So., Kitaoka, Akiyoshi. and Yamaguchi, Masami. "Perception of illusory motion in 6- to 8-month old infants" Paper presented at the annual meeting of the XVth Biennial International Conference on Infant Studies, Westin Miyako, Kyoto, Japan, Jun 19, 2006 <Not Available>. 2009-05-25 <http://www.allacademic.com/meta/p94536_index.html> |
APA Citation:
| Kanazawa, S. , Kitaoka, A. and Yamaguchi, M. K. , 2006-06-19 "Perception of illusory motion in 6- to 8-month old infants" Paper presented at the annual meeting of the XVth Biennial International Conference on Infant Studies, Westin Miyako, Kyoto, Japan <Not Available>. 2009-05-25 from http://www.allacademic.com/meta/p94536_index.html |
Publication Type: Individual Poster
Abstract: Various kinds of geometric patterns produce perceptual illusions. These geometrical illusions are one of most important stimuli to study a perception. Many previous studies of infants’ perception have used preferential looking methods (Fantz, 1963). However in traditional geometrical illusion figures such as Ponzo or Muller-Lyer figures, the amount of illusions are not enough to attract infants’ attention though the illusion is distinct phenomena. Recently, Kitaoka made new type of geometrical illusory figure (Kitaoka and Ashida, 2003; Conway et al., 2005). This stimulus called “rotating snake” was a kind of “Fraser-Wilcox illusion” (Fraser and Wilcox, 1979) which produced illusory motion by the static arrangement of regions in different colors (http://www.ritsumei.ac.jp/~akitaoka/index-j.html). The amount of illusion of “rotating snake” might be large enough to attract infants’ attention. In this study, we use this “rotating snake” as a stimulus and investigated development of perceptual illusion in infants. 32 6- to 8-month-old infants participated in this study. We prepared original “rotating snake” and control stimulus modified from the original stimulus. Rotating snake was consisted of four-color regions. In this stimulus, arrangements of regions were white, blue, black and yellow. Otherwise, in control stimulus, the arrangements of four-color regions were the combination of blue, white, blue, black regions and 2) yellow, white, yellow, black regions. At a glance, this control stimulus is very similar in appearance to the original “rotating snake.” However this stimulus does not produce illusory motion. Based on the static feature of this control stimulus, we used “rotating snake” as a target and control stimulus as a non-target. We presented the target and non-target side by side in the monitor and measured the infants’ looking time to the target. In each trial the target and non-target were presented 15 seconds and four trials were conducted for each infant. We calculated the ratio of looking time to the target. Results showed that infants looked target “rotating snake” significantlly longer (62.4 %). The difference between target and non-target was just local order of four-color regions. Other stimulus parameters, such as stimulus size or total luminance of the stimuli in non-target were same as those in target. These results suggest that 6- to 8 month-old infants perceive the illusory motion produce by the specific arrangement of four-color regions. We might explain this results by the developmental integration of motion and figure processing in 6- to 8-month-old infants. |
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