Sensitization and Habituation of the Swimming Behavior in Ascidian Larvae to Light(Neurobiology)
スポンサーリンク
概要
- 論文の詳細を見る
Ascidian larvae of dona intestinalis change their photic behavior during the course of development. Newly hatched larvae show no response to a light stimulus at any intensity. At 4 hr after hatching, larvae were induced to start to swimming upon the cessation of illumination, and to stop swimming upon the onset of illumination. At a weaker light intensity (5.0x10^<-3> J/m^2-s), the larvae showed similar responses to either a single stimulus or repeated stimuli of onset and cessation of light until 10 hr after hatching. At a stronger light intensity (3.2x10^<-1> J/m^2-s), when the stimulus was repeated, they showed sensitization and habituation of the swimming response. At 3 hr after hatching the larvae failed to show any response to an initial stimulus at any intensity of light, but after several repeated stimuli (sensitization) they showed a swimming response at light intensities above 4.0x10^<-2> J/m^2-s. At 5 hr and with intensity above 1.0x10^<-2> J/m^2-s, the larvae showed photoresponses to the first stimulus, but after several repetitions the larvae failed to stop swimming upon the onset of light (habituation). A repeated series of stimuli at stronger intensities of light caused greater habituation; this habituation was retained for about 1 min. Since the larval central nervous system in dona is comprised of only about 100 neurons, learning behavior in ascidian larvae should provide insights for a minimal mechanism of memory in vertebrates.
- 社団法人日本動物学会の論文
- 2003-01-25
著者
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Kawakami Isao
Department Of Life Science Graduate School Of Science Himeji Institute Of Technology
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Tsuda Motoyuki
Department Of Life Science Graduate School Of Science Himeji Institute Of Technology
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Tsuda Motoyuki
Department Of Life Science Faculty Of Science Himeui Institute Of Technology
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Kawakami Isao
Department Of Life Science Graduate School Of Life Science University Of Hyogo
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Shiraishi Suhei
Department of Life Science, Graduate School of Science, Himeji Institute of Technology
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Shiraishi Suhei
Department Of Life Science Graduate School Of Science Himeji Institute Of Technology
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Tsuda Motoyuki
Department of Chemistry, Faculty of Science, Hokkaido University
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