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2005 Fiscal Year Final Research Report Summary

Analysis of Extraction Mechanism of Airflow Information in the Cricket Cercal Sensory System

Research Project

Project/Area Number 16570068
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Animal physiology/Animal behavior
Research InstitutionSaitama Medical School

Principal Investigator

OGAWA Hiroto  Saitama Medical School, Faculty of Medicine, Assistant Professor, 医学部, 講師 (70301463)

Project Period (FY) 2004 – 2005
KeywordsInsect / Neuron / Dendrite / Synaptic Integration / Population Coding / Sensory Information Processing / Calcium Imaging / Voltage-dependent Calcium Channel
Research Abstract

The aim of this project is to elucidate the neural process of extraction and integration of directional information of air current in the cricket cercal sensory system, using calcium imaging and electrophysiological techniques. In 2004, the calcium imaging of the mechanosensory afferent neurons demonstrated that air-current stimuli from different directions induced different spatial patterns of Ca^<2+> elevation in the terminal arbors of sensory afferents within the terminal abdominal ganglion. To characterize the spatial patterns of the air-current-evoked ensemble activity of afferents, the optically-recorded responses to the repeated air-current stimuli from different directions were averaged and filtered. Based on the averaged image, we derived activity-pattern maps representing the direction of air current within the afferent projection. In 2005, we simultaneously monitored the Ca^<2+> responses to air-current stimuli at the dendrites of the identified giant interneurons (Gls) and … More the mechanosensory afferent terminals having synaptic connections on that dendritic branch. And, we compared the directional tuning properties of the postsynaptic GIs 10-2 and 10-3, which have different dendritic arborization pattern. The results suggest that the individual dendrite of 10-3 extracts distinct directional sensitivities from presynaptic afferents in the local region occupied by that dendritic branch. On the other hand, the dendrites of 10-2 extracts the directional information represented by ensemble activity patterns within the afferent projection. Since the electrotonic distances from the spike-initiating zone (SIZ) to each dendrite in 10-3 vary from each other, the directional sensitivity extracted by the nearest dendrite from SIZ will dominate the tuning properties of the voltage responses. In 10-2, the electrotonic distances from SIZ to each dendrite were close to each other. Therefore, the directional sensitivity extracted by all dendrites will be reflected to the overall tuning properties under the same weight. It is possible that the differences in the distribution of synaptic weights due to the dendritic geometry may be related to algorithm for the extraction and integration of the sensory information in the postsynaptic interneurons. Less

  • Research Products

    (8 results)

All 2006 2005 2004

All Journal Article (8 results)

  • [Journal Article] Visualization of ensemble activity patterna of mechanosensory afferents in the cricket cercal sensory system with calcium imaging2006

    • Author(s)
      Hiroto Ogawa
    • Journal Title

      Journal of Neurobiology 66

      Pages: 293-307

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Visualization of ensemble activity patterns of mechanosensory afferents in the cricket cercal sensory system with calcium imaging2006

    • Author(s)
      Ogawa, H., Cummins, G.I., Jacobs, G.A., Miller, J.P.
    • Journal Title

      J.Neurobiol. 66

      Pages: 293-307

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 機能が同定された感覚性介在ニューロンにおける樹状突起の能動的特性2005

    • Author(s)
      小川 宏人
    • Journal Title

      生物物理 45

      Pages: 198-202

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 感覚性介在ユーロンの樹状突起における情報抽出および統合処理機構2005

    • Author(s)
      小川 宏人
    • Journal Title

      比較生理生化学 22

      Pages: 2-10

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Active properties of dendrites in identified sensory interneurons2005

    • Author(s)
      Ogawa, H., Oka, K.
    • Journal Title

      Seibutsubutsuri 45

      Pages: 198-202

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Neural mechanism for extraciton and integration of information in dendrites of sensory interneurons2005

    • Author(s)
      Ogawa, H.
    • Journal Title

      Hikakuseiriseikagaku 22

      Pages: 2-10

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Directional sensitivity of dendritic calcium responses to wind stimuli in cricket giant interneurons.2004

    • Author(s)
      Hiroto Ogawa
    • Journal Title

      Neuroscience Letters 358

      Pages: 185-188

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Directional sensitivity of dendritic calcium responses to wind stimuli in cricket giant interneurons2004

    • Author(s)
      Ogawa, H., Baba, Y., Oka, K.
    • Journal Title

      Neurosci.Lett. 358

      Pages: 185-188

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2007-12-13  

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