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Journal of comparative physiology

, Volume 106, Issue 1, pp 111–125 | Cite as

Peripheral auditory tuning for fine frequency analysis by the CF-FM bat,Rhinolophus ferrumequinum

IV. Properties of peripheral auditory neurons
  • N. Suga
  • G. Neuweiler
  • J. Möller
Article

Summary

For echolocation,Rhinolophus ferrumequinum emits orientation sounds, each of which consists of a long constant-frequency (CF) component and short frequency-modulated (FM) components. The CF component is about 83 kHz and is used for Doppler-shift compensation. In this bat, single auditory nerve fibers and cochlear nuclear neurons tuned at about 83 kHz show low threshold and very sharp filter characteristics. The slopes of their tuning curves ranged between 1,000 and 3,500 dB/octave and their Q-10 dB values were between 20 and 400, 140 on the average (Figs. 3–5). The peripheral auditory system is apparently specialized for the reception and fine frequency analysis of the CF component in orientation sounds and Doppler-shift compensated echoes. This specialization is not due to suppression or inhibition comparable to lateral inhibition, but due to the mechanical specialization of the cochlea. Peripheral auditory neurons with the best frequency between 77 and 87 kHz showed not only on-responses, but also off-responses to tonal stimuli (Figs. 1, 2, and 6). The off-responses with a latency comparable to that of N1-off were not due to a rebound from either suppression or inhibition, but probably due to a mechanical transient occurring in the cochlea at the cessation of a tone burst.

Keywords

Lateral Inhibition Auditory System Auditory Nerve Tuning Curve Good Frequency 
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. Bruns, V.: Peripheral auditory tuning for fine frequency analysis by the CF-FM bat,Rhinolophus ferrumequinum. I. Mechanical specializations of the cochlea. J. Comp. Physiol.106, 77–86 (1976)Google Scholar
  2. Bruns, V.: Peripheral auditory tuning for fine frequency analysis by the CF-FM bat,Rhinolophus ferrumequinum. II. Frequency mapping in the cochlea. J. Comp. Physiol.106, 87–97 (1976)Google Scholar
  3. Grinnell, A.D.: Comparative auditory neurophysiology of neotropical bats employing different echolocation signals. Z. vergl. Physiol.68, 117–153 (1970)Google Scholar
  4. Grinnell, A.D.: Rebound excitation (off-responses) following non-neural suppression in the cochleas of echolocating bats. J. Comp. Physiol.82, 179–194 (1973)Google Scholar
  5. Henson, O.W., Jr.: The activity and function of the middle ear muscles in echolocating bats. J. Physiol. (bond.)180, 871–887 (1965)Google Scholar
  6. Henson, O.W., Jr.: The perception and analysis of biosonar signals by bats. In: Animal sonar systems (ed. Busnell, R.G.), p. 949–1003. Jouy-en-Josas, France: 1967Google Scholar
  7. Johnson, R.A., Henson, O.W., Jr., Goldman, L.R.: Detection of insect wing beats by the bat,Pteronotus parnellii. J. acoust. Soc. Amer.55, 853 (1974)Google Scholar
  8. Long, G.R., Schnitzler, H.-U.: Behavioral audiogram from the bat,Rhinolophus ferrumequinum. J. Comp. Physiol. (in press)Google Scholar
  9. Neuweiler, G.: Neurophysiologische Untersuchungen zum Echoortungssystem der Grossen HufeisennaseRhinolophus ferrumequinum Schreber, 1774. Z. vergl. Physiol.67, 273–306 (1970)Google Scholar
  10. Neuweiler, G., Schuller, G., Schnitzler, H.-U.: On- and off-responses in the inferior colliculus of the greater horseshoe bat to pure tones. Z. vergl. Physiol.74, 57–63 (1971)Google Scholar
  11. Nomoto, M., Suga, N., Katsuki, Y.: Discharge pattern and inhibition of primary auditory nerve fibers in the monkey. J. Neurophysiol.27, 768–787 (1964)Google Scholar
  12. Pfeiffer, R.R.: A model for two-tone inhibition of single cochlear nerve fibers. J. acoust. Soc. Amer.48, 1373–1378 (1970)Google Scholar
  13. Pollak, G., Henson, O.W., Jr., Novick, A.: Cochlear microphonic audiograms in the “pure tone” batChilonycteris parnellii parnellii. Science176, 66–68 (1972)Google Scholar
  14. Sachs, M.B., Kiang, N. Y.-S.: Two-tone inhibition in primary auditory nerve fibers. J. acoust. Soc. Amer.43, 1120–1128 (1968)Google Scholar
  15. Schnitzler, H.-U.: Die Ultraschall-Ortungslaute der Hufeisen-Fledermäuse (Chiroptera-Rhinolophidae) in verschiedenen Orientierungssituationen. Z. vergl. Physiol.57, 376–408 (1968)Google Scholar
  16. Schnitzler, H.-U.: Echoortung bei der FledermausChilonycteris rubiginosa. Z. vergl. Physiol.68, 25–38 (1970)Google Scholar
  17. Schnitzler, H.-U., Suga, N., Simmons, J.A.: Peripheral auditory tuning for fine frequency analysis by the CF-FM bat,Rhinolophus ferrumequinum. III. Cochlear microphonics and auditory nerve responses. J. Comp. Physiol.106, 99–110 (1976)Google Scholar
  18. Schuller, G.: Echoortung beiRhinolophus ferrumequinum mit frequenzmodulierten Lauten. Evoked potentials im Colliculus inferior. J. Comp. Physiol.77, 306–331 (1972)Google Scholar
  19. Schuller, G., Beuter, K., Schnitzler, H.-U.: Response to frequency-shifted artificial echoes in the batRhinolophus ferrumequinum. J. Comp. Physiol.89, 275–286 (1974)Google Scholar
  20. Simmons, J.A.: Response of the Doppler echolocation system in the batRhinolophus ferrumequinum. J. acoust. Soc. Amer.56, 672–682 (1974)Google Scholar
  21. Suga, N.: Recovery cycles and responses to frequency modulated tone pulses in auditory neurones of echolocating bats. J. Physiol. (Lond.)175, 50–80 (1964)Google Scholar
  22. Suga, N., Jen, P.H.-S.: Peripheral control of acoustic signals in the auditory system of echolocating bats. J. exp. Biol.62, 277–311 (1975)Google Scholar
  23. Suga, N., Simmons, J.A., Jen, P.H.-S.: Peripheral specialization for fine analysis of Doppler-shifted echoes in “CF-FM” batPteronotus parnellii. J. exp. Biol.63, 161–192 (1975)Google Scholar
  24. Suga, N., Simmons, J.A., Shimozawa, T.: Neurophysiological studies on echolocation system in awake bats producing CF-FM orientation sounds. J. exp. Biol.61, 379–399 (1974)Google Scholar

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • N. Suga
    • 1
  • G. Neuweiler
    • 1
  • J. Möller
    • 1
  1. 1.Arbeitsgruppe Neuro- und RezeptorphysiologieFachbereich Biologie der J.W. Goethe UniversitätFrankfurtGermany

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