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Response Properties and Spike Waveforms of Single Units in the Torus Semicircularis of the Grassfrog (Rana Temporaria) as Related to Recording Site

  • J. J. Eggermont
  • D. J. Hermes
  • A. M. H. J. Aertsen
  • P. I. M. Johannesma

Abstract

The torus semicircularis (T.S.) is the highest auditory nucleus in Anurans from which routinely single unit recordings can be obtained (Capranica, 1976). Its position in the midbrain has been studied by Potter (1965a) who also distinguished various sub-nuclei. The best frequencies (BF) of the units are reported to be bimodally distributed in approximately a 1: 1 ratio around a separation frequency of about 900 Hz (Potter, 1965b). A tonotopic organisation does not seem to be present. Response latencies were reported in the range of 8 — 150 ms at ventral parts of the torus (Potter, 1965a; Priot-Droy, 1977) which probably will affect spike waveforms. Therefore this study aims to relate spike waveforms, general response properties and recording site in the torus in order to describe the functional properties of the torus in lightly anaesthetised grassfrogs.

Keywords

Record Site Ventral Part Good Frequency Good Frequency Single Unit Recording 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Aertsen, A. and Johannesma, P., 1979, Spectro temporal analysis of auditory neurons in the grassfrog, in: “Hearing mechanisms and Spech”,O. Creutzfeld, H. Scheich and Chr. Schreiner, eds., Suppl. II, Exp. Brain Res.Google Scholar
  2. Capranica, R. R., 1976, Morphology and physiology of the auditory system, in: “Frog neurobiology”,R. Llinas and W. Precht, eds., Springer, Berlin.Google Scholar
  3. Potter, H. D., 1965a, Mesencephalic auditory region of the bullfrog, J. Neurophysiol., 28: 1132–1154.PubMedGoogle Scholar
  4. Potter, H. D., 1965b, Patterns of acoustically evoked discharges of neurons in the mesencephalon of the bullfrog, J. Neurophysiol., 28: 1155–1184.PubMedGoogle Scholar
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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • J. J. Eggermont
    • 1
  • D. J. Hermes
    • 1
  • A. M. H. J. Aertsen
    • 1
  • P. I. M. Johannesma
    • 1
  1. 1.Department of Medical Physics and BiophysicsUniversity of NijmegenNijmegenThe Netherlands

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