研究者詳細 - 伊澤栄一

進化でわかる人間行動の事典
小田亮,橋彌和秀,大坪庸介,平石界編, 朝倉書店, 2021年06月, ﾍﾟｰｼﾞ数: 320
担当範囲: 道具をつくる/つかう
遺伝子から解き明かす鳥の不思議な世界
上田恵介, 一色出版, 2019年11月, ﾍﾟｰｼﾞ数: 432
担当範囲: 第2章ｶﾗｽの認知機能
遺伝子から解き明かす脳の不思議な世界
村上安則,滋野修一,野村真, 一色出版, 2018年12月, ﾍﾟｰｼﾞ数: 520
担当範囲: 第10章もうひとつの高次脳ｼｽﾃﾑの出現鳥類の脳
比較認知心理学
伊澤栄一(編著藤田和生), 放送大学教育振興会, 2017年03月
担当範囲: 第12章ｶﾗｽのこころ
ｶﾗｽの自然史
伊澤栄一, 北海道大学出版会, 2010年
担当範囲: 183-197

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Spontaneous tempo production in cockatiels (Nymphicus hollandicus) and jungle crows (Corvus macrorhynchos)
Le Covec M., Bovet D., Watanabe S., Izawa E.I., Bobin-B?gue A.
Behavioural Processes (Behavioural Processes) 217 2024年04月
研究論文(学術雑誌), 査読有り, ISSN 03766357
概要を見る
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.
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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年10月
研究論文(学術雑誌), 最終著者, 責任著者, 査読有り
概要を見る
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.
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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年05月
共著, 責任著者, 査読有り
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Socio-ecological correlates of neophobia in corvids
Miller R., Lambert M.L., Frohnwieser A., Brecht K.F., Bugnyar T., Crampton I., Garcia-Pelegrin E., Gould K., Greggor A.L., Izawa E.I., Kelly D.M., Li Z., Luo Y., Luong L.B., Massen J.J.M., Nieder A., Reber S.A., Schiestl M., Seguchi A., Sepehri P., Stevens J.R., Taylor A.H., Wang L., Wolff L.M., Zhang Y., Clayton N.S.
Current Biology (Current Biology) 32 ( 1 ) 74 - 85 2022年01月
研究論文(学術雑誌), 共著, 査読有り, ISSN 09609822
概要を見る
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]
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Scalable representation of time in the hippocampus
SHIMBO Akihiro, Izawa E-I., Fujisawa Shigeyoshi
Science Advances 7 ( 6 ) eabd7013 2021年02月
研究論文(学術雑誌), 共著, 査読有り
概要を見る
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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ﾊｼﾌﾞﾄｶﾞﾗｽの3個体同時交渉における個体間距離に優劣関係が与える影響
伊澤, 栄一
慶応義塾大学大学院社会学研究科紀要 : 社会学心理学教育学 : 人間と社会の探究 (慶應義塾大学大学院社会学研究科) ( 90 ) 47 - 62 2021年
ISSN 0912456X
ｾｷｾｲｲﾝｺのつがい形成に伴う社会交渉の変化
伊澤, 栄一
慶応義塾大学大学院社会学研究科紀要 : 社会学心理学教育学 : 人間と社会の探究 (慶應義塾大学大学院社会学研究科) ( 73 ) 49 - 55 2012年
ISSN 0912456X
ｶﾗｽはなぜ鳴くのか?
伊澤, 栄一
哲學 (三田哲學會) ( 121 ) 183 - 205 2009年03月
ISSN 05632099

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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年08月
筆頭著者, 責任著者
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年
ISSN 09167250
概要を見る
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 supp

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