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Afferent response patterns of the crayfish statocyst with ferrite grain statolith to magnetic field stimulation

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Summary

  1. 1.

    Magnetic field stimulation to simulate the rotation of the crayfish statocyst has been performed to determine the response characteristics of the statocyst hair cells. Ferrite grains were introduced about one month before the experiment as a replacement for the natural statoliths to effect magnetic pulling.

  2. 2.

    Several types of response discharge could be recognized. Excitatory response types included tonicon, tonic-on-off, phasic-on, and phasic-on-off types. Inhibitory types can be divided into tonic-inhibition with off-excitation and phasic-inhibition with offinhibition.

  3. 3.

    Statocyst afferent neurons could be classified into several groups depending on the direction of the preferred sensitivity within the simulated rotation plane tested. Among 21 units examined, 9 units showed a single preferred direction with excitatory response and were thus unidirectional units; 3 units were bidirectional, and 5 units were multidirectional. There were 2 bidirectional inhibitory units and 2 multidirectional inhibitory units.

  4. 4.

    Analysis of the response pattern suggests that the central nervous system in the crayfish should be capable of averaging responses of more than one unit among the statocyst afferent neurons to detect the coincidence of discharge frequency change in order to obtain the positional information.

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Author notes

  1. Masahiro Ozeki

    Present address: Department of Biology, Faculty of Education, Yamanashi University, 400, Kofu, Japan

Authors and Affiliations

  1. Zoological Institute, Faculty of Science, Hokkaido University, 060, Sapporo, Japan

    Masahiro Ozeki, Masakazu Takahata & Mituhiko Hisada

Authors
  1. Masahiro Ozeki
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  2. Masakazu Takahata
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  3. Mituhiko Hisada
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Additional information

This paper is dedicated to the memory of the late Professor Mituo Tamasige of the Zoological Institute, Faculty of Science, Hokkaido University.

Dr. Ozeki is a visiting research fellow supported by a grant from the Japan Society for the Promotion of Science. This study was also partially supported by the Takeda Science Foundation.

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Ozeki, M., Takahata, M. & Hisada, M. Afferent response patterns of the crayfish statocyst with ferrite grain statolith to magnetic field stimulation. J. Comp. Physiol. 123, 1–10 (1978). https://doi.org/10.1007/BF00657338

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  • DOI: https://doi.org/10.1007/BF00657338

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