Consistency of synesthetic association varies with grapheme familiarity: A longitudinal study of grapheme-color synesthesia |
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| Affiliation: | 1. Department of Psychology, Graduate School of Humanities and Sociology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;2. Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan;3. Department of Psychology, College of Contemporary Psychology, Rikkyo University, 1-2-26, Kitano, Niiza-shi, Saitama 352-8558, Japan;1. University of Nottingham Malaysia, Malaysia;2. Nanyang Technological University, Singapore;3. University of Tasmania, Australia;1. Department of Psychology and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer- Sheva, Israel;2. Neuroimaging Center (NIC), Focus Program Translational Neuroscience, Johannes Gutenberg University Medical Center, Mainz, Germany;3. Leibniz Institute for Resilience Research, Wallstr. 7, 55122, Mainz, Germany;4. Department of Education, Hebrew University of Jerusalem, Israel;1. School of Psychology, Pevensey Building, University of Sussex, BN1 9QJ, UK;2. Dept. of Psychology, University of Edinburgh, 7 George Square, EH8 9JZ, UK;3. Dept. of Psychology, City University London, Northampton Square, London EC1V 0HB, UK;1. Department of Psychology, University of Toronto, 100 St. George Street, 4th Floor, Sidney Smith Hall, Toronto, ON M5S 3G3, Canada;2. Department of Psychology, University of California, Berkeley, Room 3210 Tolman Hall #1650, Berkeley, CA 94720-1650, USA |
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| Abstract: | Grapheme-color synesthesia is a condition in which the visual perception of letters or numbers induces a specific color sensation. The consistency of grapheme-color association has been considered as a fundamental characteristic of synesthesia. However, recent studies have indicated that this association can change across the adult lifespan, and it has become necessary to investigate the factors behind the changes within each synesthete. We conducted a longitudinal study of Japanese adult synesthetes to investigate long-term (5–8 years) changes in color responses to 300 graphemes (alphanumeric and Japanese characters). Graphemes with lower long-term consistency of synesthetic association also tended to have lower short-term consistency, indicating that grapheme-color association's consistency is determined for each grapheme. Further, less familiar graphemes had less consistent associations with their synesthetic colors. These findings suggest that a stronger grapheme-color association is formed for more familiar graphemes, leading to the consolidation of synesthetic color for such graphemes. |
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| Keywords: | Synesthesia Grapheme-color synesthesia Consistency Familiarity |
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