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Journal of Comparative Physiology A

, Volume 205, Issue 2, pp 239–252 | Cite as

Evoked potential study of the inferior collicular response to constant frequency-frequency modulation (CF-FM) sounds in FM and CF-FM bats

  • Ziying Fu
  • Na Xu
  • Guimin Zhang
  • Dandan Zhou
  • Long Liu
  • Jia Tang
  • Philip Hung-Sun JenEmail author
  • Qicai ChenEmail author
Original Paper

Abstract

The auditory system of echolocating bats is adapted for processing species-specific ultrasonic signals. While FM (frequency modulation) bats are strictly sensitive to the frequency ranges of their orientation signals or prey-generated noise, CF-FM (constant frequency-FM) bats have a disproportionate number of neurons tuned to frequencies near the CF component of their orientation sounds, and most of them are on–off responders. Furthermore, the inferior collicular neurons of the CF-FM bats discharged as single-on or double-on responders to CF-FM stimuli. To further study the differences in auditory signal processing of these two types of bats, as the first step we conducted an evoked potential response study in the inferior colliculus of the CF-FM bat, Hipposideros pratti and the FM bat, Pipistrellus abramus using CF, FM and CF-FM stimuli. The results showed that the CF sounds always evoked collicular on- and off-responses in CF-FM bats, but the FM bats only had on-responses to both CF and FM sounds, indicting species-specific neural circuits. However, when stimulated with CF-FM sounds, collicular responses were evoked by both the CF and FM components from both FM and CF-FM bats, suggesting they have some generic neural circuit.

Keywords

CF-FM bat FM bat Inferior colliculus Auditory signal processing Evoked potential 

Abbreviations

BF

Best frequency

CF

Constant frequency

CM

Cochlear microphonic

DO

Double-on

FFT

Fast Fourier transformation

FM

Frequency modulation

H

Harmonic

IC

Inferior colliculus

N1

Primary auditory neurons

NLL

Nuclei of lateral

RCFoff

Off-responses evoked by the CF sound

RCFon

On-responses evoked by the CF sound

RFM

The responses evoked by the FM sound

RH

The responses evoked by the CF-FM harmonic

RS

Summated response

SO

Single-on

Notes

Acknowledgements

The experiments were conducted with the approval of the Institutional Animal Care and Use Committee of the Central China Normal University, Wuhan, Hubei, PRC. We thank the anonymous reviewers for their helpful comments on an earlier version of this manuscript. We also thank Zhongdan Cui for critically reading the manuscript. This work was supported by grants from the National Natural Science Foundation of China (#31200832 to ZF, 31571232 to QC and 31772454 to JT).

Author contributions

QC, PJ and ZF conceived and supervised the project; PJ, ZF and QC wrote the manuscript with drafts and input from the other authors; NX, ZF, GZ, DZ, LL, and JT performed the experiments and analyzed the data; ZF and QC designed the experiments.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Ziying Fu
    • 1
  • Na Xu
    • 1
    • 4
  • Guimin Zhang
    • 1
  • Dandan Zhou
    • 1
  • Long Liu
    • 2
  • Jia Tang
    • 1
  • Philip Hung-Sun Jen
    • 3
    Email author
  • Qicai Chen
    • 1
    Email author
  1. 1.School of Life Sciences and Hubei Key Lab of Genetic Regulation & Integrative BiologyCentral China Normal UniversityWuhanChina
  2. 2.College of scienceNational University of Defense TechnologyChangshaChina
  3. 3.Division of Biological SciencesUniversity of MissouriColumbiaUSA
  4. 4.School of Psychological and Cognitive Sciences, Beijing Key Laboratory of Behavior and Mental HealthPeking UniversityBeijingChina

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