2021 Fiscal Year Final Research Report

Relation between lateralization of Kansei function and differentiation of visual function

Research Project

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Project/Area Number	17H01806
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Kansei informatics
Research Institution	Kanazawa University
Principal Investigator	Kojima Haruyuki 金沢大学, 人間科学系, 教授 (40334742)
Co-Investigator(Kenkyū-buntansha)	川端康弘北海道大学, 文学研究院, 教授 (30260392) 吉澤達也神奈川大学, 人間科学部, 教授 (90267724)
Project Period (FY)	2017-04-01 – 2021-03-31
Keywords	視野対称性 / 半球機能差 / 側性化 / 色運動処理 / 等輝度 / 小細胞系
Outline of Final Research Achievements	The present study examined the sensitivity to a visual object in left and right visual field, and then compared the functions of cortical hemispheres in terms of visual information processing. We used “isoluminant” chromatic stimuli (without luminance information) and monochromatic stimuli (only with luminance information). The same group of participants measured the detection thresholds for stationary objects or moving objects. With monochromatic stimuli, there was no difference in the thresholds between the left and right visual fields for the stationary nor moving stimuli. However, with chromatic stimuli, the motion detection thresholds and motion direction discrimination thresholds showed the difference between the two visual fields. The result is the first evidence indicating the functional differences between the left and right hemispheres in the early visual process and providing new evidence relevant to the discussions on the cortical functional laterality.
Free Research Field	実験心理学
Academic Significance and Societal Importance of the Research Achievements	利き手の形成は脳機能と密接に関係している。これまでの研究で，言語機能や論理的機能は大脳左半球，感性的・芸術的・非言語的機能は右半球にほぼ局在（側性化）していることが示されてきた。感性的機能の多くは視覚芸術や空間感覚を含む。本研究は視覚空間処理の観点から感性機能の側性化過程を調べた研究である。現代人の多数は右利きが占める。特に日本では右利きが多く，右利きを前提に文化が作り上げられてきた。このような大脳機能側性化の過程を調べることは脳機能の進化と形成の過程が明らかにし，私たち人類の知性や文化そして社会規範などが如何にして生まれたのかを知ることができると考えられる。