Do you know what you really see in daily life?
What you experience from vision is not the real external environment but the "visual world" created by your visual (neural) system. The information processing underlying the creation of the visual world is intelligent and reasonable for us to survive in different environments. The visual world you experience is a treasure trove of knowledge.
In Nagai Visual Perception Laboratory, we study such information processing in the human visual system.
News
19 June 2024: The research by Li-san, a Ph.D. candidate in our lab, has been published in Scientific Reports. His study demonstrated that when judging color differences, as the stimulus color differences become more pronounced, the strategy for judgment shifts from quantitative assessment of color differences to categorical judgments. This finding provides important insights into the characteristics of 'color differences' and the role of categories in color perception. In conjunction with this publication, A/Prof. Nagai presented his findings at Symposium on color vision and facial skin color, organized by Prof. Mizokami from Chiba University. Notably, this research continues from Ito-kun's master's thesis at Yamagata University, establishing a connection from Yamagata University to TokyoTech.
Kashi Li, & Takehiro Nagai: Increasing magnitude of color differences amplifies category effects. Scientific Reports, 14, 13665, 2024 (link to the article).
6 June 2024: Koizumi-san, a third-year undergraduate student, has been newly assigned to our laboratory. Joining midway through the academic year might be a bit challenging, but we encourage Koizumi-san to gradually acclimate to this new environment.
22 May 2024: As the themes for our new members have been decided, our research is becoming more active. In June and July, we will present our research both inside and outside TokyoTech. Now, it's time to organize our data and practice our presentations!
Research plan presentation, Dept. Information and Communications Engineering, TokoTech Information and Communication
M1 students Wang-san and Jiang-san will each present a poster.
Symposium on Color Vision and Facial Skin Color @ Chiba University
Takehiro Nagai (invited): "Color Appearance Influenced by Color Experiences"
55th Annual Conference of the Color Science Association of Japan [Fukuoka] '24
Ikuto Hanada, Takehiro Nagai: "Color features involved in color preferences of abstract paintings – an analysis using machine learning"
Yuna Okamoto, Takehiro Nagai: "Impact of spectral distributions of lighting on background colors and color constancy"
Nagi Kinoshita, Masahiro Suzuki, Osamu Masuda, Keiji Uchikawa, Takehiro Nagai: "Hue dependence in the contribution of ipRGC to brightness perception"
Takehiro Nagai, Suzuha Horiuchi: "The transformation of perceived colors due to color discrimination experiences"
The 16th Asia Pacific Conference on Vision @ Singapore
Kenta Nakajima, Takehiro Nagai: "The impact of temporal attitudes on physical and affective material impressions – an analysis using EEG"
Li Kashi, Takehiro Nagai: "Removing attention deteriorates the judgment of large color differences"
26 April 2024: We had a welcome party at our campus in conjunction with the Kaneko Laboratory. I talked with many of the students, and everyone seemed energetic and great! In addition, a research paper by Horiuchi-san, who completed her master's program at the end of the last fiscal year, has been finally published in Scientific Reports. It presents intriguing results regarding color perception, showing that color appearance changes by repeatedly discriminating specific colors over a short period. The results are very interesting in understanding the formation of our color vision.
Suzuha Horiuchi, & Takehiro Nagai: Color discrimination repetition distorts color representations. Scientific Reports, 14, 9615, 2024. (https://doi.org/10.1038/s41598-024-60283-4)