Effect of Feedback Signals on Tuning Shifts of Subcortical Neurons in Echolocation of Bat

  • Seiichi Hirooka
  • Kazuhisa Fujita
  • Yoshiki Kashimori
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4232)


Most species of bats making echolocation use Doppler-shifted frequency of ultrasonic echo pulse to measure the velocity of target. The neural circuits for detecting the target velocity are specialized for fine-frequency analysis of the second harmonic constant frequency (CF2) component of Doppler-shifted echoes. To perform the fine-frequency analysis, the feedback signals from cortex to subcortical and peripheral areas are needed. The feedback signals are known to modulate the tuning property of subcortical neurons. However, it is not yet clear the neural mechanism for the modulation of the tuning property. We present here a neural model for detecting Doppler-shifted frequency of echo sound reflecting from a target. We show that the model reproduce qualitatively the experimental results on the modulation of tuning shifts of subcortical neurons. We also clarify the neural mechanism by which the tuning property is changed depending on the feedback connections between cortical and subcortical neurons.


Auditory Cortex Inferior Colliculus Feedback Signal Electric Stimulation Neural Model 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Seiichi Hirooka
    • 1
  • Kazuhisa Fujita
    • 1
  • Yoshiki Kashimori
    • 1
    • 2
  1. 1.Department of Information Network Sciences, Graduate School of Information SystemsUniv. of Electro-CommunicationsChofu, TokyoJapan
  2. 2.Department of Applied Physics and ChemistryUniv. of Electro-CommunicationsChofu, TokyoJapan

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