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Research

Research in our laboratory focuses on vision and human science. The main themes include: (1) psychophysical investigations on visual information processing, (2) scientific approaches to kansei engineering, and (3) ergonomical applications of knowledge of cognitive science to human interface. Keywords of our research interests are: color, categorization, eye movements, attention, learning, memory, and haptics.

Effective Visual Field in Dynamic Situations

Visual field is restricted by a gaze-contingent masking window. Spatial extent of visual attention can be measured during dynamic situations (e.g. car driving, aircraft piloting, or video game playing.)
Visual Fatigue on Stereoscopic Displays

Strong connection between visual fatigue and head motion was observed by using motion capture technique.
Recognition of Facial Emotions

We are investigating the recognition process of facial emotions (including cartoon "manga" faces) by gaze tracking.
Reading Speed and Eye Movements

We found several visual factors mediate the improvement of reading speed.
Spatio-temporal Mislocalization of Flash

Please fixate the central cross. A flashing bar is perceived behind a moving bar, although both bars are physically aligned.
Categorization of Color

Our research suggests that visual system segregates colors into categories (such as red or blue) within 80 ms or much faster.
High-definition Tactile Display

An example of apparent motion on our tactile display. The rich ability is comparable to visual displays.

Publications
Journal Articles (except Japanese Articles)
  1. Kenji Yokoi, Katsumi Watanabe, & Shinya Saida: Rapid and Implicit Effects of Color Category on Visual Search. Optical Review, 19(4), 276-281, 2012.
  2. Kenji Yokoi, Tsuyoshi Tomita, & Shinya Saida: Improvement of Reading Speed and Change of Eye Movements. KANSEI Engineering International, 11(3), 101-107, 2012.
  3. Kenji Yokoi, Tomoaki Nishimori, & Shinya Saida: Interference of Verbal Labels in Color Categorical Perception. Optical Review, 15(6), 295-301, 2008.
  4. Katsumi Watanabe & Kenji Yokoi: Dynamic distortion of visual position representation around moving objects. Journal of Vision, 8(3):13, 1-11, 2008.
  5. Katsumi Watanabe & Kenji Yokoi: Object-based anisotropic mislocalization by retinotopic motion signals. Vision Research, 47(12), 1662-1667, 2007.
  6. Kenji Yokoi, Katsumi Watanabe, Ryo Kato, Takashi Kawai, Tadashi Sato, Takashi Yamazaki, & Hitoshi Yamagata: Measuring Spatial Distribution of Visual Attention in Action Video Game. KANSEI Engineering International, 6(2), 13-18, 2006.
  7. Kenji Yokoi, Katsumi Watanabe, Takatsune Kumada, Hiroshi Doi, Masaro Kogure, & Toshimasa Yamamoto: Effective Visual Field in Driving Revealed by Gaze-contingent Window Method. Review of Automotive Engineering, 27(4), 497-501, 2006.
  8. Katsumi Watanabe & Kenji Yokoi: Object-based anisotropies in the flash-lag effect. Psychological Science, 17(8), 728-735, 2006.
  9. Kenji Yokoi & Keiji Uchikawa: Color category influences heterogeneous visual search for color. Journal of the Optical Society of America A, 22(11), 2309-2317, 2005.
International Conferences
  1. Dan Uemura & Kenji Yokoi: Influence of Frequency of Eye Movements on Decision Making. The 15th Asia-Pacific Conference on Vision, i-Perception, 10(3), 2019. (Osaka, Japan, 2019.7)
  2. Kanichi Fukumoto & Kenji Yokoi: Is Trypophobia Affected by Size Illusion? The 15th Asia-Pacific Conference on Vision, i-Perception, 10(3), 2019. (Osaka, Japan, 2019.7)
  3. Dan Uemura, Shouta Katayama, & Kenji Yokoi: The effect of eye movements in preferential decision. Vision Sciences Society 2019, Journal of Vision, 19(10), 126, 2019. (St. Pete Beach, Florida, 2019.5)
  4. Kanichi Fukumoto, Mototsugu Hayashi, & Kenji Yokoi: The effect of spatial properties on trypophobia. Vision Sciences Society 2019, Journal of Vision, 19(10), 32a, 2019. (St. Pete Beach, Florida, 2019.5)
  5. Kenji Yokoi, Tsuyoshi Tomita, & Shinya Saida: Improvement of Reading Speed and Eye Movements. Asia-Pacific Conference on Vision, Abstract, 27, 2011. (Hong Kong, China, 2011.7)
  6. Kenji Yokoi, Katsumi Watanabe, & Shinya Saida: Rapid and Implicit Categorization of Basic Colors. Asia-Pacific Conference on Vision, Abstract, 52, 2008. (Brisbane, Australia, 2008.7)
  7. Kenji Yokoi, Katsumi Watanabe, Takashi Kawai, Ryo Kato, Tadashi Sato, Takashi Yamazaki, & Hitoshi Yamagata: Effects of Video Games on Dynamics of Visual Attention. International Conference on Kansei Engineering and Emotion Research 2007, Abstract, 33, 2007. (Sapporo, Japan, 2007.10)
  8. Takako Yoshida, Kenji Yokoi, Yuki Miyazaki, Hiromi Wake, & Tenji Wake: 2 deg. narrowed field of view can explain the process speed of tactile search for change, Vision Sciences Society 2007, Journal of Vision, 7(9), 689a, 2007. (Sarasota, Florida, 2007.5)
  9. Takako Yoshida, Yuki Miyazaki, Kenji Yokoi, Hiromi Wake, & Tenji Wake: Can a Narrow Field of View Explain the Extremely Small Amount of Tactile Memory During Tactile Search for Change? EuroHaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (IEEE Haptics Symposium 2007), 559-560 (Tsukuba, Japan, 2007.3)
  10. Takako Yoshida, Yuki Miyazaki, Kenji Yokoi, Hiromi Wake, & Tenji Wake: Can a narrow field of view explain the extremely small amount of tactile memory during tactile search for change? 47th Annual Meeting of the Psychonomic Society, Abstract, 11, 126, 2006. (Houston, 2006.11)
  11. Takako Yoshida, Yuki Miyazaki, Kenji Yokoi, Hiromi Wake, & Tenji Wake: Can a Narrow Field of View Explain the Extremely Small Amount of Tactile Memory during Tactile Search for Change? --1. Memory Estimation--, The Fourth Asian Conference on Vision, 262, 2006. (Shimane, Japan. 2006.7)
  12. Yuki Miyazaki, Takako Yoshida, Kenji Yokoi, Hiromi Wake, & Tenji Wake: Can a Narrow Field of View Explain the Extremely Small Amount of Tactile Memory during Tactile Search for Change? --2. Eye Movement Behavior--, The Fourth Asian Conference on Vision, 263, 2006. (Shimane, Japan. 2006.7)
  13. Kenji Yokoi, Katsumi Watanabe, Takashi Kawai, Ryo Kato, Tadashi Sato, Takashi Yamazaki, & Hitoshi Yamagata: Dynamic evaluation of distribution of visual attention during playing video game. Advances in Computer Entertainment Technology 2006. (Hollywood, California, 2006.6)
  14. Kenji Yokoi & Katsumi Watanabe: Dynamic distortion of visual space around a moving object. Vision Sciences Society 2006. (Sarasota, Florida, 2006.5)
  15. Kenji Yokoi & Katsumi Watanabe: Distortion of positional representation of visual objects by motion signals. Vision Sciences Society 2005, Journal of Vision, 5(8), 206a, 2005. (Sarasota, Florida, 2005.5)
  16. Keiji Uchikawa, Kenji Yokoi & Yasuki Yamauchi: Categorical color constancy is more tolerant than apparent color constancy. Vision Sciences Society 2004, Journal of Vision, 4(8), 327a, 2004. (Sarasota, Florida, 2004.5)
  17. Kenji Yokoi & Keiji Uchikawa: Categorical color mechanism mediates heterochromatic visual search. Fall Vision Meeting 2003, Journal of Vision, 3(12), 68, 2003.(Tucson, Arizona, 2003.10)
  18. Osamu Masuda, Keiji Uchikawa & Kenji Yokoi: Effects of retinal eccentricity on the temporal summation of double flashes. Fall Vision Meeting 2003, Journal of Vision, 3(12), 63, 2003.(Tucson, Arizona, 2003.10)
  19. Takehiro Nagai, Kenji Yokoi & Keiji Uchikawa: Figure segregation achieved by color-distribution differences in colored texture stimuli. Fall Vision Meeting 2003, Journal of Vision, 3(12), 79, 2003.(Tucson, Arizona, 2003.10)
  20. Kenji Yokoi & Keiji Uchikawa: Set-size Effects Unveil the Role of Higher-order Color Perception in Heterochromatic Visual Search. The Second Asian Conference on Vision, 79, 2002.(Gyeongju, Korea, 2002.7)
  21. Ayumi Hazama, Katsunori Okajima, Kenji Yokoi, Keiji Uchikawa, Masahiro Yamaguchi, & Koichi Kita: Perceptual Color Matching Between CRT-Display and Color Chips. The Second Asian Conference on Vision, 84 , 2002. (Gyeongju, Korea, 2002.7)
  22. Osamu Masuda, Keiji Uchikawa & Kenji Yokoi: Effects of Cone Contrast on Chromatic Assimilation. The Second Asian Conference on Vision, 85, 2002. (Gyeongju, Korea, 2002.7)
  23. Taketoshi Uchida, Keiji Uchikawa & Kenji Yokoi: Effect of R/g Contrast Between Two Inhomogeneous Surfaces on Color Appearance of Chromaticities in Each Surface. The Second Asian Conference on Vision, 86, 2002. (Gyeongju, Korea, 2002.7)
  24. Keiji Uchikawa, Yasuhiro Emori, Takashi Toyooka & Kenji Yokoi: Color constancy in categorical color appearance. Vision Sciences Society 2002 Abstract, 190, 2002. (Sarasota, Florida, 2002.5)
  25. Kenji Yokoi & Keiji Uchikawa: Influences of Categorical Color Perception on Heterochromatic Visual Search. First Asian Conference on Vision , Abstract, 61, 2001. (Kanagawa, Japan, 2001.7)
  26. Kenji Yokoi & Keiji Uchikawa: Categorical color perception influences heterochromatic visual search. Vision Sciences Society 1st Annual Meeting, Abstract, 35-36, 2001. (Sarasota, Florida, 2001.5)
  27. Kenji Yokoi & Keiji Uchikawa: Visual search for a color target among heterochromatic distractors. Optical Society of America Annual Meeting 2000, Abstract, 92, 2000. (Providence, Rhode Island, 2000.10)
  28. Hiroyasu Ujike, Kenji Yokoi, & Keiji Uchikawa: The effects of colour difference on perceptual fading. The John Dalton International Conference; 200 years of colour vision research, Abstract, K6.3, 1994. (London, 1994)

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