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Toshiya Matsushima
Hokkaido University
133Publications
23H-index
1,987Citations
Publications 133
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#1Naoya Aoki (Teikyo University)H-Index: 5
#2Shinji Yamaguchi (Teikyo University)H-Index: 11
Last.Koichi J. Homma (Teikyo University)H-Index: 24
view all 7 authors...
Filial imprinting of domestic chicks has a well-defined sensitive (critical) period lasting in the laboratory from hatching to day 3. It is a typical model to investigate the molecular mechanisms underlying memory formation in early learning. We recently found that thyroid hormone 3,5,3ʹ-triiodothyronine (T3) is a determinant of the sensitive period. Rapid increases in cerebral T3 levels are induced by imprinting training, rendering chicks imprintable. Furthermore, the administration of exogenou...
#1Momoko Miura (Hokkaido University)H-Index: 2
#2Naoya Aoki (Teikyo University)H-Index: 5
Last.Toshiya Matsushima (Hokkaido University)H-Index: 23
view all 5 authors...
Filial imprinting is associated with induction of predisposed preference to animations that bear visual features of Johansson’s biological motion (BM), and the induction is limited to a few days after hatching. As thyroid hormone (3,5,3'-triiodothyronine, T3) plays a critical role in determining the sensitive period of imprinting, we examined if exogenously applied T3 (or iopanoic acid, IOP; a selective inhibitor for converting enzymes) could also sensitize (or desensitize) the BM induction. Chi...
#1Yukiko Ogura (UTokyo: University of Tokyo)H-Index: 1
#2Hidetoshi Amita (NIH: National Institutes of Health)H-Index: 6
Last.Toshiya Matsushima (Hokkaido University)H-Index: 23
view all 3 authors...
Results of intertemporal choice paradigm have been accounted for mostly by psychological terms such as temporal discounting of subjective value. Inability to wait for delayed gratification (choice impulsiveness, as opposed to self-control) is often taken to represent violated rationality. If viewed from foraging ecology, however, such impulsiveness can be accountable as adaptive adjustments to requirements in nature. First, under the circumstance where foragers stochastically encounter food item...
#1Yuri Takemura (Hokkaido University)H-Index: 1
#2Shinji Yamaguchi (Teikyo University)H-Index: 11
Last.Toshiya Matsushima (Hokkaido University)H-Index: 23
view all 6 authors...
Abstract Filial imprinting leads to the formation of social attachment if training is performed during a brief sensitive period after hatching. We found that thyroid hormone (3,5,3′-triiodothyronine, T3) acts as a critical determining factor of the sensitive period in domestic chicks. Imprinting upregulates gene expression of the converting enzyme (Dio2, type 2 iodothyronine deiodinase) in the telencephalon, leading to increased brain T3 content. If systemically applied, T3 facilitates imprintin...
#1Shinji Yamaguchi (Teikyo University)H-Index: 11
#2Naoya Aoki (Teikyo University)H-Index: 5
Last.Koichi J. Homma (Teikyo University)H-Index: 24
view all 4 authors...
Abstract Filial imprinting is the behavior observed in chicks during the sensitive or critical period of the first 2–3 days after hatching; however, after this period they cannot be imprinted when raised in darkness. Our previous study showed that temporal augmentation of the endogenous thyroid hormone 3,5,3′-triiodothyronine (T 3 ) in the telencephalon, by imprinting training, starts the sensitive period just after hatching. Intravenous injection of T 3 enables imprinting of chicks on days 4 or...
#1Qiuhong Xin (Hokkaido University)H-Index: 2
#2Yukiko Ogura (Hokkaido University)H-Index: 5
Last.Toshiya Matsushima (Hokkaido University)H-Index: 23
view all 3 authors...
Abstract To examine how resource competition contributes to patch-use behaviour, we examined domestic chicks foraging in an I-shaped maze equipped with two terminal feeders. In a variable interval schedule, one feeder supplied grains three times more frequently than the other, and the sides were reversed midway through the experiment. The maze was partitioned into two lanes by a transparent wall, so that chicks fictitiously competed without actual interference. Stay time at feeders was compared ...
#1Qiuhong Xin (Hokkaido University)H-Index: 2
#2Yukiko Ogura (Hokkaido University)H-Index: 5
Last.Toshiya Matsushima (Hokkaido University)H-Index: 23
view all 4 authors...
To investigate the neural basis of socio-economic behaviors in birds, we examined the effects of bilateral electrolytic lesions of arcopallium (Arco, the major descending pallial area of the avian telencephalon) and the surrounding nuclei in domestic chicks. We tested foraging effort (running distance) in an I-shaped maze with two food patches that delivered food in a biased manner according to a variable interval schedule. Normally, chicks run back and forth between the patches, and the patch u...
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