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TSUJIMURA Sei-ichi

    Graduate School of Design and Architecture Industrial Innovation Design　Professor
Last Updated :2024/03/19

Researcher Information

URL

J-Global ID

Research Interests

  • Psychophysics   cognition   perception   illumination   color perception   Brightness perception   Brain science   Experimental Psychology   vision   melanopsin   

Research Areas

  • Humanities & social sciences / Cognitive sciences / Vision Science
  • Informatics / Intelligent informatics / Vision Science
  • Informatics / Perceptual information processing / Psychophysics
  • Life sciences / Neuroscience - general / Psychophysics
  • Humanities & social sciences / Experimental psychology / Vision Science
  • Informatics / Sensitivity (kansei) informatics / Vision Science

Academic & Professional Experience

  • 2019/04 - Today  Nagoya City UniversityFaculty of Design and ArchitectureProfessor
  • 2018/04 - 2019/03  Kagoshima UniversityFaculty of Sciences and EngineeringProfessor
  • 2004 - 2018/03  Kagoshima University Faculty of Sciences and Engineering Associate Professor助教授・准教授
  • 2002 - 2004  Max Planck Institute for brain research, Germany (Johann Wolfgang Goethe-Universität Frankfurt am Main)Research assistant
  • 2000 - 2002  State University of New York College of Optometry, USAResearch Fellow
  • 1999 - 2000  Aston University, UKResearch Fellow
  • 1988 - 1993  Toshiba Co. Ltd.
  • 1984/04 - 1988/03  National Defence Academy理工電気工学科

Association Memberships

  • THE VISION SOCIETY OF JAPAN   THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN   

Published Papers

Conference Activities & Talks

  • THE RELATIONSHIP BETWEEN THE STEADY-STATE PUPIL RESPONSE AND BRIGHTNESS SENSITIVITY OBTAINED BY DIRECT HETEROCHROMATIC BRIGHTNESS MATCHING BASED ON MELANOPSIN STIMULATION  [Not invited]
    Tomoe Ito; Sei-ichi Tsujimura
    The 7th Conference of Asia Color Association (ACA), 2022  2022/10
  • RELATIONSHIP BETWEEN BRIGHTNESS PERCEPTION AND PHOTORECEPTOR STIMULATIONS INCLUDING MELANOPSIN  [Not invited]
    Aoi Takasu; Sei-ichi Tsujimura
    The 7th Conference of Asia Color Association (ACA), 2022  2022/10
  • Achromatic contrast sensitivity varies depending on melanopsin stimulation of the background  [Not invited]
    A. Takasu; S. Tsujimura
    43rd European Conference on Visual Perception  2021/08
  • T. Ito; S. Tsujimura
    43rd European Conference on Visual Perception  2021/08
  • Sei-ichi Tsujimura
    The Scientific Committee of the 33rd International Pupil Colloquium, Murcia, Spain  2019/10
  • メラノプシン細胞の明るさ・色コントラスト感度特性への影響  [Invited]
    辻村 誠一
    第21回日本感性工学会 企画セッション  2019/09
  • 網膜メラノプシン細胞および錐体細胞の独立光制御法  [Invited]
    辻村 誠一
    日本機械学会 第30回バイオフロンティア講演会  2019/07
  • Sei-ichi Tsujimura
    The Asia Color Association Conference  2019
  • Human contrast sensitivity varies dependent on melanopsin stimulation  [Invited]
    Sei-ichi Tsujimura
    Japan Society of Physiological Anthropology  2018/12
  • メラノプシン細胞の明るさチャネルへの影響  [Invited]
    辻村 誠一
    視覚科学技術コンソーシアム  2018/11
  • Sei-ichi Tsujimura
    European Conference on Visual Perception  2018/08
  • Time Stays Still Under Blue Light: Subjective Time Expansion With Increased Stimulation Level of Intrinsically Photosensitive Retinal Ganglion Cells
    Pei-Ling Yang; Sei-ichi Tsujimura; Akiko Matsumoto; Wakayo Yamashita; Su-Ling Yeh
    I-PERCEPTION  2017/10  SAGE PUBLICATIONS LTD
  • A Temporal Difference Between Cone- and Melanopsin-Mediated Signals in Pupillary Pathway
    Wakayo Yamashita; Sei-ichi Tsujimura
    I-PERCEPTION  2017/10  SAGE PUBLICATIONS LTD
  • Dissociating the Roles of Background Color and ipRGCs on Audiovisual Integration
    I-tan Weng; Yi-Chuan Chen; Li Chu; Akiko Matsumoto; Wakayo Yamashita; Sei-Ichi Tsujimura; Su-Ling Yeh
    I-PERCEPTION  2017/10  SAGE PUBLICATIONS LTD
  • Increased ipRGC Stimulation Enhances Spatial Contrast Sensitivity at Low Spatial Frequencies in Peripheral Vision
    Sung-en Chien; Akiko Matsumoto; Wakayo Yamashita; Sei-ichi Tsujimura; Su-Ling Yeh
    I-PERCEPTION  2017/10  SAGE PUBLICATIONS LTD
  • メラノプシン細胞の明るさ及び色メカニズムに対する影響  [Invited]
    辻村 誠一
    視覚科学フォーラム2017  2017/09
  • Melanopsin cells and visual performance  [Invited]
    Sei-ichi Tsujimura
    International Pupil Colloquium  2017/09
  • メラノプシン細胞による反対色メカニズムへの影響  [Invited]
    辻村 誠一
    日本色彩学会 基礎視覚研究会  2016/12
  • 自然光に学ぶ：「生体リズム」を調整する光環境の創出  [Invited]
    辻村 誠一
    自然に学ぶものづくりフォーラム２０１６  2016/10
  • メラノプシン細胞の非撮像系経路および撮像系経路への影響  [Invited]
    辻村 誠一
    映像情報メディア学会研究会  2015/11
  • Collaborative research experience  [Invited]
    Sei-ichi Tsujimura
    EURAXIS Links Japan Tour  2015/10
  • The ganzfeld-evoked pupil response to cone- and melanopsin-stimulation  [Invited]
    Sei-ichi Tsujimura
    International Pupil Colloquium  2015/09
  • メラノプシン細胞への刺激と明るさ知覚  [Invited]
    辻村 誠一
    第37回日本光医学・光生物学会  2015/07
  • Human visual performance influenced by melanopsin and cone photoreceptors  [Invited]
    Sei-ichi Tsujimura
    International Symposium on Human Adaptation to Environment and Whole-body Coordination  2015/03
  • hotoreceptive retinal ganglion cell and its contribution to visual performance  [Invited]
    Sei-ichi Tsujimura
    Healthy Ageing: Facilitating research through international partnership  2014/07
  • 光受容システムと睡眠・覚醒 －光源スペクトルの理解から光環境の新しい応用展開まで－  [Invited]
    辻村 誠一
    日本睡眠学会 第39回定期学術集会：シンポジウム  2014/07
  • メラノプシン神経節細胞の非撮像系経路および撮像系経路への影響  [Invited]
    辻村 誠一
    視知覚の現象・機能・メカニズム - 生理学的、心理物理学的、計算論的アプローチ, 生理学研究所研究会  2014/06
  • メラノプシンとロービジョン：メラノプシン総論  [Invited]
    辻村 誠一
    第４９回日本眼光学学会総会  2013/09
  • 光と睡眠―メラノプシンの発見から最近の照明技術の動向まで：メラノプシン神経節細胞の働き  [Invited]
    辻村 誠一
    日本睡眠学会 第37回定期学術集会：シンポジウム  2012/06
  • Delayed response of human melanopsin retinal ganglion cells on the pupillary light reflex  [Invited]
    Sei-ichi Tsujimura
    Prof. Bernard Gilmartin Festschrift  2011/09
  • Contribution of melanopsin-expressing retinal ganglion cells to pupillary pathway studied with a multi-primary illumination system  [Invited]
    Sei-ichi Tsujimura
    PUPIL INOFRMATICS: Pupil Response Mechanisms, Visual Performance & Clinical Applications  2008/09
  • Convergent evidence from psychophysics to physiology  [Invited]
    Sei-ichi Tsujimura
    A seminar at Max Planck Institute for Brain research  2002/09

MISC

Awards & Honors

  • 2017/09 International Pupil Colloquium, Morges, Switzerland Loewenfeld lecture
     
    受賞者: Sei-ichi Tsujimura
  • 1998/07 日本視覚学会 ベストプリゼンテーション賞受賞
     
    受賞者: 辻村 誠一

Research Grants & Projects

  • 日本学術振興会：科学研究費助成事業 基盤研究(A)
    Date (from‐to) : 2021/04 -2026/03 
    Author : 北岡 明佳
  • 日本学術振興会：科学研究費助成事業 挑戦的研究(萌芽)
    Date (from‐to) : 2022/06 -2025/03 
    Author : 辻村 誠一
  • 日本学術振興会：科学研究費助成事業 基盤研究(A)
    Date (from‐to) : 2020/04 -2025/03 
    Author : 辻村 誠一
     
    ２０００年頃、網膜にメラノプシン細胞と呼ばれる新たな光受容器が発見された。メラノプシン細胞は概日リズムや瞳孔の対光反射、明るさの知覚等、様々な影響を生体に与えることが報告されている。研究代表者は先行研究においてメラノプシン細胞のみを選択的に刺激することが可能な刺激装置を開発し、メラノプシン細胞の生体への機能解明に取り組んでいる。本研究課題では、メラノプシン細胞の生体への影響を実験心理学、生物学、工学的手法を用いて包括的に解明することを目指す。２０２０年度は、辻村らが開発した多原色光源刺激装置を用いて、メラノプシン細胞のみを選択的に刺激し、明るさ知覚への寄与に関する実験を立ち上げた。従来の刺激条件よりも自然光に近いスペクトラムを用いた。このことにより、より自然環境に近い光環境で実験を進めることが可能となることが期待される。この実験環境によって、心理物理学実験を実施し、基礎的なデータを取得した。国立台湾大学とメラノプシン細胞の視聴覚統合過程への影響に関する論文、および高知工科大学とメラノプシン細胞の明るさ知覚への寄与についての論文をまとめた。 さらに国立台湾大学との共同研究を進め、メラノプシン細胞の明るさコントラスト感度への寄与について、詳細にデータを解析し現在論文の執筆中である。工学的研究ではこれまでに得られた知見をもとに新たな多原色光源刺激装置を試作した。従来の装置と比較して、光源を安定化させることにより、高精度の刺激の提示が可能になることが期待される。２０２１年度には装置の性能をより詳細に検証し、引き続き開発を実施する予定である。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    Date (from‐to) : 2017/04 -2021/03 
    Author : Tsujimura Sei-ichi
     
    There are photoreceptors in the retina, cone and rod cells. In addition, the third type of photoreceptor was discovered around 2000 which is called melanopsin cells. In this study, we aimed to clarify how the non-imaging pathway originating from melanopsin cells processes and sends light signals in the brain by using a multi-primary stimulation system that can independently control the amount of stimulation of melanopsin cells and the other photoreceptors. We have shown that selective stimulation of melanopsin cells affects the perception of time. Furthermore, we quantified the effect on the perception of brightness from melanopsin cells.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2017/06 -2020/03 
    Author : Higuchi Shigekazu
     
    High light transmittance of the crystal lens and large pupil diameter are thought to be the cause of the large effect of light at night on circadian rhythms in children. In the present study, to verify these relationships, we first developed a device to measure the light transmittance of the crystal lens in vivo. Next, we found that the ratio of circadian clock photoreception (non-visual photoreception) calculated using light transmittance of the lens and pupil diameter between adults and children was almost the same as the ratio of light exposure-induced melatonin suppression between adults and children. Furthermore, the results of the study on the visual effects of illuminance showed that children had a higher sense of brightness and black visibility than adults even at relatively low illuminance levels (10 lx-100 lx).
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    Date (from‐to) : 2016/04 -2019/03 
    Author : Kawasaki Hiroshi
     
    In this study, (A) we develop a light field projector equipped with a coded aperture in the lens of the projector and achieved the expansion of the depth of field. Furthermore, in order to use the technique in a real system, (B) we developed a calibration method for light field projectors. In addition, (C) a system that achieves dense three-dimensional reconstruction in a scene where many obstacles exist by using multiple projectors by creating synthetic light fields and (D) a system which can draw arbitrary patterns on planes at different depths are developed. The results were accepted by several top international conferences, as well as patents are applied.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
    Date (from‐to) : 2015/04 -2019/03 
    Author : Kitaoka Akiyoshi
     
    We examined visual illusions using several approaches including experimental psychology, fMRI studies, mathematics, and animal experiments. A great progress was made in the study of color illusions. We found two different types of spatial color mixture, accompanied by the proposal of an impressive color illusion image in which observers can see either white or black in the same pattern depending on the types of spatial color mixture. Moreover, the Munker illusion, one of the strongest color illusions, can be explained in this context. Other approaches also made a progress in the study of visual illusions.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    Date (from‐to) : 2015/04 -2019/03 
    Author : Ono Satoshi; Tsujimura Seiichi
     
    This study has developed a technology to simultaneously optimize multiple problems in different fields but related to each other. The proposed method treats problems as independent subproblems and optimizes using existing methods and/or heuristics of the problems in the form of coevolution, rather than formulating them as one big problem. Unlike the conventional method, the proposed method avoids local optima. This study has also applied the above method to design of digital watermark for authentication of two-dimensional code. Simultaneously designing watermarking scheme and coded aperture pattern for watermark extraction, the depth of field of watermark extraction was successfully extended.
  • Melanopsin-based vision in health and disease
    European Research Council：Advanced Grant (AdG), LS5, ERC-2010-AdG_20100317
    Date (from‐to) : 2011/05 -2017/04
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    Date (from‐to) : 2014/04 -2017/03 
    Author : TSUJIMURA Sei-ichi
     
    In this study we have investigated how a stimulation of melanopsin ganglion cells contributes to visual pathway using several psychophysical and neurological techniques. We used a multi-primary stimulation system that enables us to stimulate each photoreceptor independently based on silent-substitution technique. In addition we have developed a multi-primary display system and measured contrast sensitivities as a function of spatial frequency.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    Date (from‐to) : 2014/04 -2017/03 
    Author : Tsujimura Sei-ichi
     
    In this study we have developed a pupil perimetry associated with a stimulation of melanopsin ganglion cells using silent-substitution technique. The aim of this study was to estimate a spatial distribution of melanopsin ganglion cells at retina in human. There was a technical difficulty to measure large pupil responses in the previous studies. We have improved the equipment that enabled us to collect the large pupil responses at a part of visual field in pupil perimetry.
  • Brightness is a Function of the Melanopsin System
    Swiss National Science Foundation (SNSF)：International short research visits
    Date (from‐to) : 2016/08 -2016/10
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    Date (from‐to) : 2012/04 -2016/03 
    Author : Higuchi Shigekazu; KITAMURA SHINGO; HIDA AKIKO; TSUJIMURA SEI-ICHI
     
    In our previous study, we found that a single nucleotide polymorphism of I394T (rs1079610) in the melanopsin gene was associated with pupillary light response in human. Since melanopsin has a characteristic spectral sensitivity to light, in this study, we aimed to determine associations among I394T genotypes and physiological responses under diverse light wavelengths. In the results, the CC+CT subjects showed greater percentage of pupillary constriction than the TT subjects under light conditions that strongly excites melanopsin (high-intensity and short wavelength). In addition, there was a difference in spectral sensitivity between the genotype groups; the TC subjects and TT subjects showed peak responsiveness at 476 nm light and 480 nm light, respectively. In the comparison of habitual sleep between the genotype groups, sleep/wake timing of CC subjects was significantly later than the TT or TC subjects.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    Date (from‐to) : 2012/04 -2014/03 
    Author : TSUJIMURA Seiichi
     
    The aim of this project was to develop a multi-primary display system that can generate test stimuli with spatio-temporal modulation. Firstly, we modified the multi-primary stimulation system that we had developed in the previous study. We optimized optical components in the system and installed high power LEDs. We also used a micro-computer to control a projector in the system. After these modifications we have achieved a high temporal resolution as we expected.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    Date (from‐to) : 2010 -2012 
    Author : MORITA Takeshi; TSUJIMURA Seiichi; FUKUDA Yumi
     
    The frequency characteristics of non-visual photoreceptor; melanopsin expressing retinal ganglion cells (mRGCs) were investigated with the light which stimulates mRGCs independently. The results showed the mRGCs response to a light stimulus at around 8Hz was high. In contrast, th e response to light stimulus tended to be smaller under light condition that change at lower and higher frequencies. The effects of blue LED light on melatonin secretion were investigated under the v arious frequencies. The melatonin secretion was not inhibited by the blue LED light with frequency changes at 1000Hz and 7.14Hz, although it was inhibited by the constant blue LED light at nighttime.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    Date (from‐to) : 2010 -2011 
    Author : HIGUGHI Shigekazu; HIDA Akiko; TSUJIMURA Sei-ichi
     
    Melanopsincontaining retinal ganglion cells(mRGCs) play an important role in nonvisual response to light, such as circadian photoentrainment, lightinduced melatonin suppression and pupillary light reflex. We examined the association between melanopsin gene polymorphism and pupillary light response. Pupil diameter in the C/C+ C/T genotype(n=38) of rs1079610(T3941) under low illuminance light(
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Date (from‐to) : 2009 -2011 
    Author : YUNOKUCHI Kazutomo; TSUJIMURA Seiichi; NURUKI Atso
     
    Recently, stiffness in the shoulders or peripheral muscles becomes an issue of public concern. The purpose of this study was to elucidate the recovery effect of magnetic field or the thermotherapy for muscle fatigue. The healthy subjects participated in the experiment with raising one's hand using a hand dynamometer. The bloodstream, MVC(maximum voluntary contraction), skin temperature tended to increase, but an increase of iEMG was inhibited. The results suggested the recovery effects by the magnetic field and warmth.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Date (from‐to) : 2009 -2011 
    Author : TSUJIMURA Seiichi; NURUKI Atsuo; YUNOKUCHI Kazutomo; MORITA Takeshi
     
    We have investigated a functional role of the intrinsically photosensitive retinal ganglion cells(ipRGCs) to the non-image forming and image-forming pathways. It was found that the ipRGCs contribute to the steady-state pupillary control mechanism. The manuscript for a study of the contribution on the image-forming pathway is in press.
  • Pupil control mechanisms and clinical applications
    The Great Britain Sasakawa Foundation：Butterfield Awards for UK-Japan collaboration in medical research and public health practice
    Date (from‐to) : 2008/09 -2010/08 
    Author : Sei-ichi Tsujimura
  • Dissecting rod, cone and melanopsin contributions to the pupil light reflex
    The Royal Society：International Joint Project Grants Programme
    Date (from‐to) : 2009/04 -2010/03 
    Author : Sei-ichi Tsujimura
  • 日本学術振興会：科学研究費助成事業 萌芽研究
    Date (from‐to) : 2007 -2008 
    Author : 平井 有三; 辻村 誠一
     
    霊長類の視覚系で発見された赤-青緑・二重拮抗型色受容野を持つ神経細胞が、人の視覚系でも存在するのか否かを検証するための視覚心理実験を行った。人の視覚系で存在が明らかになっているL-M色メカニズム(Lは長波長に感度の最大値を持つ錐体、Mは中間波長に感度の最大値を持つ錐体)に対するS錐体(Sは短波長に感度の最大値を持つ錐体)の寄与の有無を検証するため、Quadrature Protocolを用いた等輝度L-M刺激のしきい値に対するS入力による変化を、空間周波数を変えながら測定した。その結果、心理学的には、S入力はMに対してではなく、Lに対して影響を与えることを明らかにした。すなわち、人の場合、赤-青緑型ではなく赤紫-緑型の二重拮抗型色受容野である可能性が高いことが分かった(研究目的1)。また、色収差の影響が排除できないので確定的なことはいえないが、空間周波数による違いから、S入力は帯域通過型の特性を有している可能性があることが示唆された(研究目的2)。今後、色収差の影響カミない実験系を構築し、さらに本研究を進める予定である。 本研究を行う動機となった道路交通標識の実時間認識システムに関する研究は順調に進めることができ、今年度はITSシンポジウムで2件の講演を行った。赤色標識認識については円や直線境界の検出にRANSACを用い、円形領域の抽出や「止まれ」の逆三角形領域の検出をロバストに行えるようになった。また、「止まれ」の標識の特徴抽出にS-R特徴(統計的リーチ特徴)を用い、高い認識精度を得ることができた。また、認識処理に部分空間法を用いることで、ロバストなシステムを構築することができた。さらに、青い方向指示標識へと認識対象を拡張している。
  • Travel Grant
    The Royal Society：
    Date (from‐to) : 2001/04 -2002/03 
    Author : Sei-ichi Tsujimura

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