Izawa, Eiichi

写真a

Affiliation

Faculty of Letters, Department of Humanities and Social Science (Human Relations) （Mita）

Position

Professor

Related Websites
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Career 【 Display / hide 】

  • 2002.04
    -
    2004.03

    JSPS doctal research fellow/ Graduate School of Bioagricultural Sciences, Naogya University

  • 2004.04
    -
    2005.12

    JSPS Post-doctal research fellow/ Graduate School of Human relations, Keio University

  • 2006.01
    -
    2008.03

    慶應義塾大学文学研究科　准教授（有期）（魅力ある大学院教育イニシアティブ）

  • 2008.04
    -
    2012.03

    慶應義塾大学社会学研究科　准教授（有期）（人文グローバルＣＯＥ”論理と感性に関する先端的教育研究拠点”）

  • 2012.04
    -
    2013.03

    慶應義塾大学 論理と感性のグローバル研究センター, 共同研究員

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Academic Background 【 Display / hide 】

  • 1999.03

    Nagoya University, School of Science, Department of Physics

    University, Graduated

  • 1999.04
    -
    2001.03

    Nagoya University, 大学院生命農学研究科, 生物機構・機能科学専攻

    Graduate School, Completed, Master's course

  • 2001.04
    -
    2003.03

    Nagoya University, Bioagricultural Sciences, Biological Mechanisms and Functions

    Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 博士(農学), Nagoya University, Coursework, 2003.03

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Research Areas 【 Display / hide 】

  • Humanities & Social Sciences / Experimental psychology (Animal Psychology)

  • Neuroethology

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Books 【 Display / hide 】

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Papers 【 Display / hide 】

  • Spontaneous tempo production in cockatiels (Nymphicus hollandicus) and jungle crows (Corvus macrorhynchos)

    Le Covec M., Bovet D., Watanabe S., Izawa E.I., Bobin-Bègue A.

    Behavioural Processes （Behavioural Processes)  217 2024.04

    Research paper (scientific journal), Accepted,  ISSN  03766357

    　View Summary

    Musical and rhythmical abilities are poorly documented in non-human animals. Most of the existing studies focused on synchronisation performances to external rhythms. In humans, studies demonstrated that rhythmical processing (e. g. rhythm discrimination or synchronisation to external rhythm) is dependent of an individual measure: the individual tempo. It is assessed by asking participants to produce an endogenous isochronous rhythm (known as spontaneous motor tempo) without any specific instructions nor temporal cue. In non-human animal literature, studies describing spontaneous and endogenous production of motor tempo without any temporal clue are rare. This exploratory study aims to describe and compare the spontaneous motor tempo of cockatiels and jungle crows. Data were collected on spontaneous beak drumming behaviours of birds housed in laboratory. Inter beak strokes intervals were calculated from sound tracks of videos. The analyses revealed that inter beak strokes intervals are non-randomly distributed intervals and are isochronous. Recorded spontaneous motor tempos are significantly different among some cockatiels. Since we could only conduct statistical analysis with one corvid, we cannot conclude about this species. Our results suggest that cockatiels and jungle crows have individual tempos, thus encouraging further investigations.

  • Social encounters produce different autonomic response between dominants and subordinates in crows

    Takeda K., Takahashi N., Izawa E.I.

    Royal Society Open Science （Royal Society Open Science)  9 （ 10 ）  2022.10

    Research paper (scientific journal), Last author, Corresponding author, Accepted

    　View Summary

    Recent studies of behavioural physiology on animals have suggested the crucial role of peripherally physiological signals in eliciting arousal and emotion. Heart rate (HR) is one of the useful and critical signals to measure autonomic regulation as a physiological basis for arousal and emotion in response to biologically significant stimuli such as social encounter with conspecific individuals. However, our understanding of peripherally physiological response such as HRs and autonomic activities under social contexts of non-human animals is still limited, particularly in birds. Here, we examined the autonomic activity of behaving crows exposed to a dominant and a subordinate conspecific by using non-invasive electrocardiogram recording. We found different patterns of autonomic responses dependent on the relative dominance position: dominant crows encountering subordinates showed the elevation of sympathetic activity, whereas subordinates encountering dominants showed decreased HR with elevated parasympathetic activity. This is the first study in birds to report different autonomic responses dependent on relative dominance positions during dyadic social encounters. The present study advances our understanding of the role of the peripheral autonomic system, as an interactive system with the brain, in eliciting emotion/arousal associated with socially challenging environments from an evolutionary perspective.

  • Measurement of urinary mesotocin in large-billed crows by enzyme-linked immunosorbent assay.

    Seguchi A. Mogi K. Izawa E-I

    Journal of Veterinary Medical Science 84   520 - 524 2022.05

    Joint Work, Corresponding author, Accepted

  • Socio-ecological correlates of neophobia in corvids.

    Miller R, Lambert ML, Frohnwieser A, Brecht KF, Bugnyar T, Crampton I, Garcia-Pelegrin E, Gould K, Greggor AL, Izawa E-I, Kelly DM, Li Z. Luo Y, Luong LB, Massen JJM, Nieder A, Reber SA, Schiestl M, Seguchi A, Sepehri P, Stevens JR, Taylor AH, Wang L, Wolff LM, Zhang Y, and Clayton NS

    Current Biology （Current Biology)  32 （ 1 ） 74 - 85 2022.01

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  09609822

    　View Summary

    Behavioral responses to novelty, including fear and subsequent avoidance of novel stimuli, i.e., neophobia, determine how animals interact with their environment. Neophobia aids in navigating risk and impacts on adaptability and survival. There is variation within and between individuals and species; however, lack of large-scale, comparative studies critically limits investigation of the socio-ecological drivers of neophobia. In this study, we tested responses to novel objects and food (alongside familiar food) versus a baseline (familiar food alone) in 10 corvid species (241 subjects) across 10 labs worldwide. There were species differences in the latency to touch familiar food in the novel object and novel food conditions relative to the baseline. Four of seven socio-ecological factors influenced object neophobia: (1) use of urban habitat (versus not), (2) territorial pair versus family group sociality, (3) large versus small maximum flock size, and (4) moderate versus specialized caching (whereas range, hunting live animals, and genus did not), while only maximum flock size influenced food neophobia. We found that, overall, individuals were temporally and contextually repeatable (i.e., consistent) in their novelty responses in all conditions, indicating neophobia is a stable behavioral trait. With this study, we have established a network of corvid researchers, demonstrating potential for further collaboration to explore the evolution of cognition in corvids and other bird species. These novel findings enable us, for the first time in corvids, to identify the socio-ecological correlates of neophobia and grant insight into specific elements that drive higher neophobic responses in this avian family group. Video abstract: [Figure presented]

  • Scalable representation of time in the hippocampus

    SHIMBO Akihiro, Izawa E-I., Fujisawa Shigeyoshi

    Science Advances 7 （ 6 ） eabd7013 2021.02

    Research paper (scientific journal), Joint Work, Accepted

    　View Summary

    Hippocampal “time cells” encode specific moments of temporally organized experiences that may support hippocampal functions for episodic memory. However, little is known about the reorganization of the temporal representation of time cells during changes in temporal structures of episodes. We investigated CA1 neuronal activity during temporal bisection tasks, in which the sets of time intervals to be discriminated were designed to be extended or contracted across the blocks of trials. Assemblies of neurons encoded elapsed time during the interval, and the representation was scaled when the set of interval times was varied. Theta phase precession and theta sequences of time cells were also scalable, and the fine temporal relationships were preserved between pairs in theta cycles. Moreover, theta sequences reflected the rats' decisions on the basis of their time estimation. These findings demonstrate that scalable features of time cells may support the capability of flexible temporal representation for memory formation.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • 空飛ぶ情動：カラスの社会における個体間の反発と親和

    伊澤　栄一

    科学 (岩波書店)  93   702 - 705 2023.08

    Lead author, Corresponding author

  • Salivary corticosterone measurement in large-billed crows by enzyme-linked immunosorbent assay

    Aota I., Yatsuda C., Izawa E.I.

    Journal of Veterinary Medical Science (Journal of Veterinary Medical Science)  85 ( 1 ) 71 - 75 2023

    ISSN  09167250

    　View Summary

    Salivary corticosteroid measurement, as a surrogate for plasma corticosteroid levels to evaluate an animal’s stress or metabolic state, commonly used in mammals. However, the validity of salivary corticosterone (CORT) measurements in birds has not yet been reported.We aimed tomeasure salivary CORT in crows using a commercially available CORT enzyme-linked immunosorbent assay kit. An adrenocorticotropic hormone (ACTH) challenge experiment using synthetic cosyntropin, an ACTH analogue, was conducted to compare CORT level elevations between the serum and the saliva in a 10–60 min range. Both salivary and blood CORT was significantly elevated 10 min after injecting synthetic cosyntropin. The results supported the validation of salivary CORT as a surrogate for a blood CORT in crows.

  • Measurement of urinary mesotocin in large-billed crows by enzyme-linked immunosorbent assay

    Seguchi A., Mogi K., Izawa E.I.

    Journal of Veterinary Medical Science (Journal of Veterinary Medical Science)  84 ( 4 ) 520 - 524 2022

    ISSN  09167250

    　View Summary

    Mesotocin (MT) is an avian homologue of oxytocin (OT). Behavioral pharmacological studies in birds have suggested the involvement of MT in socially affiliative behavior. However, investigations of peripheral MT levels associated with social behavior are lacking because non-invasive methods to measure surrogate plasma MT have yet to be established. This study aimed to measure urinary MT in crows using a commercially available OT enzyme-linked immunosorbent assay kit. Urine samples were collected after intravenous injection of MT and centrifuged to separate urine and fecal components. We found that urinary MT was significantly elevated 15–30 min after MT injection. These results validate our method for the use of urine samples for the measurement of peripheral MT levels in crows.

  • Understand the evolution of animal behaviour at the different levels: brain/body anatomy and physiology, and behavioural functions

    Ei-Ichi IZAWA

    Science IMPACT (Science Impact Ltd.)  12   70 - 72 2018

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

  • カラスから探る社会認知機能の進化　－知性に大脳“皮質”は必要か？－

    伊澤栄一

    科学 (岩波書店)  79   678 - 681 2009

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 絆形成がもたらす排除性孤立：鳥類３個体交渉に着目した新たな実験系の構築

    2023.06
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    2025.03

    挑戦的研究（萌芽）, Principal investigator

  • 内臓感受性から社会構造の理解に迫る：鳥類モデルを用いた比較心理学研究

    2023.04
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    2026.03

    基盤研究(B), Principal investigator

  • 個体間の宥和関係形成を支える脳-内臓回路の比較認知神経科学研究

    2020.04
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    2023.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

  • 身体拡張性の比較心理学

    2019.06
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory) , Principal investigator

  • 情動をうみだす脳と身体の協働システムの比較認知神経科学研究

    2017.04
    -
    2020.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

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Courses Taught 【 Display / hide 】

  • ADVANCED SEMINAR IN PSYCHOPHYSIOLOGY AND NEUROPSYCHOLOGY 1

    2024

  • ADVANCED SEMINAR IN BIOPSYCHOLOGY 2

    2024

  • ADVANCED SEMINAR IN BIOPSYCHOLOGY 1

    2024

  • ADVANCED SEMINAR IN PSYCHOPHYSIOLOGY AND NEUROPSYCHOLOGY 1

    2024

  • SEMINAR IN BIOPSYCHOLOGY 2

    2024

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Memberships in Academic Societies 【 Display / hide 】

  • 日本動物心理学会

    　

  • 日本動物行動学会

    　

  • 日本鳥学会

    　

  • 日本動物学会

    　

  • 日本比較生理生化学会

    　

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Committee Experiences 【 Display / hide 】

  • 2014.07
    -
    Present

    理事, 日本動物心理学会

  • 2016.04
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    Present

    科学技術予測センター専門調査員, 文部科学省

  • 2018.01
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    Present

    評議員, 比較生理生化学会

  • 2020.10
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    Present

    連携会員(第25期）, 日本学術会議

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