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1995 Fiscal Year Final Research Report Summary

Dynamic Analysis of Neuronal Pathway by Engineering Identification Method for Non-linear Signal Processing

Research Project

Project/Area Number 06640873
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 動物生理・代謝
Research InstitutionHokkaido University

Principal Investigator

SHIMOZAWA Tateo  Hokkaido Univ., Res.Inst.Electron.Sce., Professor, 電子科学研究所, 教授 (10091464)

Co-Investigator(Kenkyū-buntansha) SHIMIZU Toshinobu  Hokkaido Univ., Res.Inst.Electron.Sci., Instructor, 電子科学研究所, 助手 (60250510)
BABA Yoshichika  Hokkaido Univ., Res.Inst.Electron.Sci., Instructor, 電子科学研究所, 助手 (30238232)
MIZUNAMI Makoto  Hokkaido Univ., Res.Inst.Electron.Sci., Assoc.Professor, 電子科学研究所, 助教授 (30174030)
Project Period (FY) 1994 – 1995
KeywordsNon-linearity / Neuron / Signal processing / Pulse density encoding / Gaussian white noise / Wiener's Analysis
Research Abstract

Neuronal pathways, which operate as non-linear signal processors, were decomposed into several elements by using engineering method od informatics, and the internal mechanisms were revealed.
First, accuracy of decomposition into sandwich system, a cascade of two linear filter elements sandwiching a nonmemory nonlinear element, was evaluated. The length of time domain data necessary for the element estimation ofinsect sensory system was determined for the z-transform method of the first and second Wiener kernels. Second, details of dynamics of the pulse density encoding mechanism of the insect wind receptor were extracted after removing the statistical response properties given by Wiener kernels. The refractory period of spike initiation was the origin of the hysteresis in the pulse density incoding.Third, input pathways to cercal sensory interneurons of cricket were studied. It was found that the spiking and nonspiking interneurons have different organizations of input pathway. Fourth, a new method for sandwich system decomposition, in which Laguerre functions were used to expand Wiener kernels, was developed. Fifth, by using the single electrode current clamp recording method, signal transfer from the synaptic current to spike train sequence in the cricket cercal sensory interneuron was determined. The post-synaptic membrane was confirmed as an integrating, passive low-pass filter, while the spike initiation area was identified as a band-pass active filter. Sixth, the stochastic resonance and the effects of noise in spike encoding were studied by numerical solution of the Hodgkin-Huxley model. Noise plays an essential role for spike encoding rather than deteriorating the signal.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Y. Baba, L. Hirota, T. Shimozawa, T. Yamaguchi: "Differing afferent connections of spiking and nonspiking wind-sensitive local interneurons in the teminal abdominal ganglion" J. Comp. Physiol. A.176. 17-30 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 赤沢年一、下澤楯夫、清水利伸、馬場欣哉: "コオロギ感覚神経細胞のパルス密度変調に見られるヒステリシスについて" 電子情報通信学会技術報告. NC94-73. 105-112 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 太田利彦,清水利伸、馬場欣哉,下澤楯夫: "Laguerre函数を用いたSandwich Systemの同定法" 電子情報通信学会技術報告. NLP95-31. 41-46 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水波誠: "昆虫の単眼系の働きと進化" 科学(岩波). 64. 582-589 (1994)

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      「研究成果報告書概要(和文)」より
  • [Publications] M. Mizunami: "Processing of contrast signals in the insent ocellar System" Zool. Science. 11. 63-73 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Mizunami: "Neural organization of ocellar pathways in the cockroach prain" J. Comp. Neurol.352. 458-468 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下澤楯夫、大原昌弘、浦野知: "スケーリング:動物設計論-動物の大きさは何で決まるのか-" コロナ社、東京, 302 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水波誠: "昆虫の脳を探る.富永佳也編集P. 218-213 キノコ体は記憶の座である。" 共立出版、東京, 280 (1995)

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      「研究成果報告書概要(和文)」より
  • [Publications] Y.Baba, K.Hirota, T.Shimozawa and T.Yamaguchi: "Differing afferent connections of spiking and nonspiking wind-sensitive local interneurons in the terminal ganglion of the cricket Gryllus bimaculatus." J.Comp.Physiol.A.176. 17-30 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Akazawa, T.Shimozawa, T.Shimizu and Y.Baba: "Hysteresis of pulse-density encoding in cricket's sensory neuron." Tech.Rep.IEICE.NC94-73. 105-112 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Ohta, T.Shimizu, Y.Baba and T.Shimozawa: "Identification of a sandwich system using Laguerre functions." Tech.Rep.IEICE.NLP95-31. 41-46 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mizunami: "Signal processing and evolution of the insect ocellar system." Kagaku(Iwanami). 64. 582-589 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.mizunami: "Information processing in the insect ocellar system." Akvances in Insect Physiology. 25. 151-265 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mizunami: "Neural organization of ocellar pathways in the cockroach brain." J.Comp.Neurol.352. 458-468 (1995)

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

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Published: 1997-03-04  

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