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-->   Chihiro Hiramatsu Last modified date：2024.05.13 Associate Professor / Department of Design Futures Faculty of Design 1 Research Interests 2 Current and Past Project 3 Academic Activities 3.1 Books 3.2 Papers 3.3 Reports 3.4 Presentations 4 Membership in Academic Society 5 Educational Activities Graduate School Design Futures Course Graduate School of Design Human Science Course Graduate School of Design Undergraduate School Department of Design School of Design Department of Design School of Design Other Organization Other Other Other E-Mail　*Since the e-mail address is not displayed in Internet Explorer, please use another web browser:Google Chrome, safari. Homepage https://kyushu-u.elsevierpure.com/en/persons/chihiro-hiramatsu　Reseacher Profiling Tool　Kyushu University Pure Academic Degree Life science Country of degree conferring institution (Overseas) No Field of Specialization Visual Psychophysiology ORCID(Open Researcher and Contributor ID) 0000-0003-1191-4476 Total Priod of education and research career in the foreign country 00years00months Outline Activities Underlying the diversity of color perception in humans are unique neural representations formed by interaction between genetics and environmental stimuli. My research aims to understand neural mechanisms underlying the subjective experience of color. Research Research Interests My research interests lie in exploring the subjective experience of color, which is challenging to share. Interestingly, despite the diversity of color vision, humans share color categories through language. By focusing on the variety of color vision, shaped by evolutionarily inherited genetics and interactions with the environment, and by exploring the neural representation of color in the brain, I aim to understand the meaning of color experience.keyword : color vision, evolution, diversity, gene, neural mechanism, subjective experience2013.09. Current and Past Project Human color vision is diverse, and the perception of the same light wavelength varies according to receptor characteristics. However, diversity and commonality in the neural representations of color are expected because people with genetically different color vision may categorize certain color stimuli as the same color. This study extracts features of neural representations important for decoding the colors seen from the neural activity patterns of people with different color visions while looking at the same color. From the commonalities and differences in the features, we investigate the neural mechanisms involved in subjective sensory awareness. Considerable amount of color vision variation exists in humans due to genetic polymorphisms. Approximately 5% males possess color vision types that show difficulty in discriminating red from green. The difference in color vision would influence attention and might lead to differences in visual preference and/or esthetic sense. In this study, I aim to explore how color vision differences influence attention to visual arts by using eye-tracking technique. I am examining if the genetic differences can be a factor which produces individual differences in visual esthetic sense. By elaborating a methodology which estimates differences of visual attention, preference and esthetic sense, this study would contribute to creating desirable universal visual design. The international research group designed experiments to explore the function, evolution, and diversity of color vision in primates. Academic Activities Books  Show All Books >> 1. Chihiro Hiramatsu, Factors Affecting Facial Recognition in Capuchin Monkeys. In: Anderson J.R., Kuroshima H. (eds) Comparative Cognition., Springer, https://doi.org/10.1007/978-981-16-2028-7_5, 67-82, 2021.08, [URL]. Reports  Show All Reports >> Papers  Show All Papers >> 1. Chihiro Hiramatsu, Tatsuhiko Takashima, Hiroaki Sakaguchi, Xu Chen, Satohiro Tajima, Takeharu Seno, Shoji Kawamura, Influence of colour vision on attention to, and impression of, complex aesthetic images., Proceedings of the Royal Society B: Biological Sciences, 10.1098/rspb.2023.1332, 290, 2006, 20231332, 2023.09, [URL], Humans exhibit colour vision variations due to genetic polymorphisms, with trichromacy being the most common, while some people are classified as dichromats. Whether genetic differences in colour vision affect the way of viewing complex images remains unknown. Here, we investigated how people with different colour vision focused their gaze on aesthetic paintings by eye-tracking while freely viewing digital rendering of paintings and assessed individual impressions through a decomposition analysis of adjective ratings for the images. Gaze-concentrated areas among trichromats were more highly correlated than those among dichromats. However, compared with the brief dichromatic experience with the simulated images, there was little effect of innate colour vision differences on impressions. These results indicate that chromatic information is instructive as a cue for guiding attention, whereas the impression of each person is generated according to their own sensory experience and normalized through one's own colour space.. 2. Chihiro Hiramatsu, Amanda D. Melin, William L. Allen, Constance Dubuc, James P. Higham, Experimental evidence that primate trichromacy is well suited for detecting primate social colour signals, Proceedings of the Royal Society B: Biological Sciences, 10.1098/rspb.2016.2458, 284, 1856, 2017.06, [URL]. 3. Chihiro Hiramatsu, Naokazu Goda, Hidehiko Komatsu, Transformation from image-based to perceptual representation of materials along the human ventral visual pathway, NEUROIMAGE, 10.1016/j.neuroimage.2011.04.056, 57, 2, 482-494, 2011.07, [URL]. 4. Chihiro Hiramatsu, Amanda D. Melin, Filippo Aureli, Colleen M. Schaffner, Misha Vorobyev, Yoshifumi Matsumoto, Shoji Kawamura, Importance of Achromatic Contrast in Short-Range Fruit Foraging of Primates, PLOS ONE, 10.1371/journal.pone.0003356, 3, 10, e3356, 2008.10, [URL]. Presentations  Show All Presentations >> Membership in Academic Society Association for the Scientific Study of Consciousness (ASSC) Color Science Association of Japan Japan Society of Physiological Anthropology Society of Evolutionary Studies, Japan The Japanese Society for Animal Psychology The Japan Neuroscience Society Primate Society of Japan Educational Educational Activities Teaching biology and vision science at School of Design, Department of Visual Communication Design (~2023) and Designs Futures Course (2020~), Graduate School of Design, Human Science Course/Human Science International Course and Designs Futures Course (2022~), KIKAN Education. Unauthorized reprint of the contents of this database is prohibited. Copyright © 2006, Kyushu University. All rights reserved.