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Directional hearing in the gray tree frog Hyla versicolor: Eardrum vibrations and phonotaxis

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Summary

  1. 1.

    We used laser vibrometry to study the vibrational frequency response of the eardrum of female gray tree frogs for different positions of the sound source in three-dimensional space. Furthermore, we studied the accuracy of 3-D phonotaxis in the same species for sounds with different frequency contents.

  2. 2.

    The directionality of the eardrum was most pronounced in a narrow frequency range between 1.3 and 1.8 kHz.

  3. 3.

    The average 3-D, horizontal and vertical jump error angles for phonotactic approaches with a sound similar to the natural advertisement call (1.1 and 2.2 kHz frequency components) were 23°, 19° and 12°, respectively.

  4. 4.

    3-D jump error angle distributions for the 1.4 + 2.2 kHz, 1.0 kHz and 2.0 kHz sounds were not significantly different from that for the 1.1 + 2.2 kHz sound.

  5. 5.

    The average 3-D jump error angle for the 1.4 kHz sound was 36°, and the distribution was significantly different from that for the 1.1 + 2.2 kHz sound. Hence, phonotactic accuracy was poorer in the frequency range of maximum eardrum directionality.

  6. 6.

    Head scanning was not observed and is apparently unnecessary for accurate sound localization in three-dimensional space.

  7. 7.

    Changes in overall sound pressure level experienced by the frog during phonotactic approaches are not an important cue for sound localization.

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Abbreviations

IVAD :

interaural vibration amplitude difference

VA :

vibration amplitude

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Authors and Affiliations

  1. Biological Institute, Odense University, DK-5230, Odense M, Denmark

    Morten Buhl Jørgensen

  2. Division of Biological Sciences, University of Missouri, 65211, Columbia, MO, USA

    H. Carl Gerhardt

Authors
  1. Morten Buhl Jørgensen
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  2. H. Carl Gerhardt
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Jørgensen, M.B., Gerhardt, H.C. Directional hearing in the gray tree frog Hyla versicolor: Eardrum vibrations and phonotaxis. J Comp Physiol A 169, 177–183 (1991). https://doi.org/10.1007/BF00215864

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  • DOI: https://doi.org/10.1007/BF00215864

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