Details of the Researcher

PHOTO

Tatsuya Oikawa
Section
Research Institute of Electrical Communication
Job title
Specially Appointed Research Fellow
Degree

  • Dr. Eng. (Toyohashi University of Technology)

Profile

色と初期視覚系を理解するため、サル神経生理とヒト心理物理の実験をしています。
2024/12 博士（工学）（豊橋技術科学大学）、2024/10-2025/9 豊橋技術科学大学 IRES² 研究員を経て、2025/10から現職。

できること:
サルを対象とした行動実験、神経生理実験（覚醒下脳深部単一ユニット/多点記録）、組織学的解析（解剖、染色）
ヒトを対象とした視覚心理物理実験（PsychToolBox/PsychoPy）＋アイトラッカーを用いた視線・瞳孔計測

Research History 2

  • 2025/10 - Present
    Tohoku University　Research Institute of Electrical Communication　Postdoc

  • 2024/10 - 2025/10
    Toyohashi University of Technology

Education 3

  • Toyohashi University of Technology　Graduate School of Engineering　Department of Computer Science and Engineering

    2019/04 - 2024/09

  • Ichinoseki National College of Technology　Department of Intelligent Systems Engineering

    2012/04 - 2017/03

  • Toyohashi University of Technology　Faculty of Engineering　Department of Computer Science and Engineering

    2017/04 - 2019/03

Professional Memberships 2

  • Society for Neuroscience

    2022 - Present

  • The Japan Neuroscience Society

    2020 - Present

Research Interests 6

  • 心理物理学

  • 電気生理学

  • 外側膝状体

  • 霊長類

  • 視覚

  • 色覚

Research Areas 4

  • Informatics / Perceptual information processing /

  • Humanities & social sciences / Experimental psychology /

  • Life sciences / Basic brain sciences /

  • Life sciences / Neuroscience - general /

Awards 1

  1. Student Travel Award

    2019/08　The 15th Asia-Pacific Conference on Vision (APCV 2019)　Color naming is more reliable than position detection in peripheral visual field

Papers 3

  1. Localization of blue-on cells in the lateral geniculate nucleus of the macaque monkey using a tungsten marking technique

    Tatsuya Oikawa, Kowa Koida

    Scientific Reports　2026/09/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-026-68691-4 　

    eISSN： 2045-2322

    More details Close

    Abstract The lateral geniculate nucleus (LGN) relays color information from the retina to the cerebral cortex via anatomically segregated pathways. Although accumulating evidence suggests that neurons conveying signals from short-wavelength-sensitive (S) cones reside in the koniocellular (K) layers, it has been technically challenging to definitively correlate physiological recordings with their histological locations in macaques, which are routine trichromatic primate. In this study, we investigated the distribution of blue-responsive (S+) cells in the macaque LGN using extracellular single-unit recordings combined with a novel, high-resolution, and minimally invasive technique for marking recording sites. Recorded units were classified using cone-isolating stimuli to identify their cone inputs, and the recording site of S+ units were marked for histological verification. We found that the majority of cells responsive to S+ stimulation were located either within the K-layers or at the border between the K- and parvocellular (P) layers. We also found one instance located in the pregeniculate nucleus. Our results provide strong evidence that both New World and Old World monkeys share this color-segregating pathway in the LGN.

  2. Digital Signal Processor Integrated Recording System for Visual Neurophysiology using a Single Personal Computer Peer-reviewed

    Tatsuya OIKAWA, Kowa KOIDA

    International Journal of Affective Engineering　2025

    DOI： 10.5057/ijae.IJAE-D-24-00015 　

  3. A Fine-Scale and Minimally Invasive Marking Method for Use with Conventional Tungsten Microelectrodes. Peer-reviewed

    Oikawa T, Nomura K, Hara T, Kowa Koida

    eNeuro　2023/09/25

    DOI： 10.1523/eneuro.0141-23.2023 　

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    In neurophysiology, achieving precise correlation between physiological responses and anatomic structures is a significant challenge. Therefore, the accuracy of the electrode marking method is crucial. In this study, we describe a tungsten-deposition method, in which tungsten oxide is generated by applying biphasic current pulses to conventional tungsten electrodes. The electrical current used was 40-50 μA, which is similar to that used in electrical microstimulation experiments. The size of the markings ranged from 10 to 100 μm, corresponding to the size of the electrode tip, which is smaller than that of existing marking methods. Despite the small size of the markings, detection is easy as the marking appears in bright red under dark-field observation after Nissl staining. This marking technique resulted in low tissue damage and was maintained in vivo for at least two years. The feasibility of this method was tested in mouse and macaque brains.

Presentations 16

  1. 低侵襲マーキング手法を用いた脳深部の機能マッピング Invited

    及川達也

    IRES²コロキア　2025/09/18

  2. ディスプレイ色域におけるBezold–Brücke現象の評価

    及川達也, 佐々木三公子, 大内啓子, 名取和幸, 鯉田孝和

    日本視覚学会2025年夏季大会 2025年9月　2025/09/10

  3. タングステン電極マーキング手法を用いたニホンザル外側膝状体青色応答細胞の位置同定

    及川達也, 鯉田孝和

    第47回日本神経科学大会　2024/07

  4. TDT-MatlabPTB: 単一PCによる視覚神経生理学実験システムの構築

    及川達也, 鯉田孝和

    生体医工学シンポジウム2023　2023/09

  5. Tatsuya Oikawa, Kento Nomura, Toshimitsu Hara, Kowa Koida,

    Tatsuya Oikawa, Kento Nomura, Toshimitsu Hara, Kowa Koida

    Neuroscience 2022　2022/11

  6. Bezold-Brücke現象のディスプレイ色域における評価

    及川達也, 佐々木三公子, 大内啓子, 名取和幸, 鯉田孝和

    生理研研究会 東海地区感覚機能研究会　2025/12/04

  7. 高輝度・高コントラストLCDを用いたBezold–Brücke現象の検証

    及川達也, 鯉田孝和

    日本視覚学会2025年冬季大会　2025/01

  8. タングステン電極マーキング手法を用いたニホンザル外側膝状体青色応答細胞の位置同定

    及川達也, 鯉田孝和

    生理研研究会 東海地区感覚機能研究会　2024/12/05

  9. 高精細マーキングによるニホンザル外側膝状体青色応答細胞の位置同定

    及川達也, 鯉田孝和

    視覚科学フォーラム2024 研究会　2024/11

  10. Mapping of blue-on cells in the lateral geniculate nucleus of the macaque monkey using a tungsten marking technique

    Tatsuya OIKAWA, Kowa KOIDA

    International Symposium on Brain Structure and Function　2024/07

  11. タングステン電極マーキング手法を用いたニホンザル外側膝状体青色応答細胞の位置同定

    及川達也, 鯉田孝和

    第5回サル脳新技術研究会　2024/03

  12. Blue-on cells are localized in the K layers of lateral geniculate nucleus of Macaque monkey

    及川達也, 鯉田孝和

    第46回日本神経科学大会　2023/08

  13. ニホンザル外側膝状体における青色応答細胞のK 層局在

    及川達也, 鯉田孝和

    第25回 視覚科学フォーラム2022 研究会（生理研研究会 「機能と構造の視覚科学研究会」）　2022/09

  14. 双極性電流によるタングステン微小電極の位置マーキング手法”

    及川達也, 野村健人, 原利充, 河野剛士, 沼野利佳, 鯉田孝和

    電気情報通信学会 ME とバイオサイバネティック研究会　2021/03

  15. A fine scale and low invasive marking method for use with Tungsten microelectrodes

    及川達也, 野村健人, 原利充, 河野剛士, 沼野利佳, 鯉田孝和

    第43回日本神経科学大会　2020/07

  16. Color naming is more reliable than position detection in peripheral visual field

    Tatsuya Oikawa, Kowa Koida

    The 15th Asia-Pacific Conference on Vision (APCV 2019)　2019/08

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Other 2

  1. 公益財団法人 リンナイ奨学財団 給付型奨学金

  2. 豊橋技術科学大学 博士課程教育リーディングプログラム