Sound enhances detection of visual target during infancy: a study using illusory contours |
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Authors: | Wada Yuji Shirai Nobu Otsuka Yumiko Midorikawa Akira Kanazawa So Dan Ippeita Yamaguchi Masami K |
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Affiliation: | a Sensory and Cognitive Food Science Laboratory, National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan b Department of Psychology, Tokyo Metropolitan University, Tokyo 192-0397, Japan c Japan Society for the Promotion of Science, Tokyo 102-8472, Japan d Department of Infants’ Brain and Cognitive Development, Tokyo Women’s Medical University, Tokyo 162-8666, Japan e Department of Psychology, Chuo University, Tokyo 192-0393, Japan f Department of Psychology, Japan Women’s University, Kanagawa 214-8565, Japan g Precursor Research for Embryonic Science and Technology, JST (JST-PRESTO), Saitama 351-0198, Japan |
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Abstract: | In adults, a salient tone embedded in a sequence of nonsalient tones improves detection of a synchronously and briefly presented visual target in a rapid, visually distracting sequence. This phenomenon indicates that perception from one sensory modality can be influenced by another one even when the latter modality provides no information about the judged property itself. However, no study has revealed the age-related development of this kind of cross-modal enhancement. Here we tested the effect of concurrent and unique sounds on detection of illusory contours during infancy. We used a preferential looking technique to investigate whether audio-visual enhancement of the detection of illusory contours could be observed at 5, 6, and 7 months of age. A significant enhancement, induced by sound, of the preference for illusory contours was observed only in the 7-month-olds. These results suggest that audio-visual enhancement in visual target detection emerges at 7 months of age. |
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Keywords: | Multisensory perception Illusory contours Infant perception Audio-visual enhancement Visual detection Human development |
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