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Journal of Experimental Biology, Vol 63, Issue 1 161-192, Copyright © 1975 by Company of Biologists
JOURNAL ARTICLES |
N Suga, JA Simmons and PH Jen
Pteronotus parnellii uses the second harmonic (61-62 kHz) of the CF component in its orientation sounds for Doppler-shift compensation. The bat's inner ear is mechanically specialized for fine analysis of sounds at about 61-62 kHz. Because of this specialization, cochlear microphonics (CM) evoked by 61-62 kHz tone bursts exhibit prominent transients, slow increase and decrease in amplitude at the onset and cessation of these stimuli. CM-responses to 60-61 kHz tone bursts show a prominent input-output non-linearity and transients. Accordingly, a summated response of primary auditory neurones (N1) appears not only at the onset of the stimuli, but also at the cessation. N1-off is sharply tuned at 60-61 kHz, while N1-on is tuned at 63-64 kHz, which is 2 kHz higher than the best frequency of the auditory system because of the envelope-distortion originating from sharp mechanical tuning. Single peripheral neurones sensitive to 61-62 kHz sounds have an unusually sharp tuning curve and show phase-locked responses to beats of up to 3 kHz. Information about the frequencies of Doppler-shifted echoes is thus coded by a set of sharply tuned neurones and also discharges phase-locked to beats. Neurones with a best frequency between 55 and 64 kHz show not only tonic on-responses but also off-responses which are apparently related to the mechanical off-transient occuring in the inner ear and not to a rebound from neural inhibition.
This article has been cited by other articles:
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M. Kossl, E. Foeller, M. Drexl, M. Vater, E. Mora, F. Coro, and I. J. Russell Postnatal Development of Cochlear Function in the Mustached Bat, Pteronotus parnellii J Neurophysiol, October 1, 2003; 90(4): 2261 - 2273. [Abstract] [Full Text] [PDF]
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M. Smotherman and W. Metzner Effects of Echo Intensity on Doppler-Shift Compensation Behavior in Horseshoe Bats J Neurophysiol, February 1, 2003; 89(2): 814 - 821. [Abstract] [Full Text] [PDF]
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Y. Zhang and N. Suga Modulation of Responses and Frequency Tuning of Thalamic and Collicular Neurons by Cortical Activation in Mustached Bats J Neurophysiol, July 1, 2000; 84(1): 325 - 333. [Abstract] [Full Text] [PDF]
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S. A. Chowdhury and N. Suga Reorganization of the Frequency Map of the Auditory Cortex Evoked by Cortical Electrical Stimulation in the Big Brown Bat J Neurophysiol, April 1, 2000; 83(4): 1856 - 1863. [Abstract] [Full Text] [PDF]
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W. W. Wilson and W. E. O'Neill Auditory Motion Induces Directionally Dependent Receptive Field Shifts in Inferior Colliculus Neurons J Neurophysiol, April 1, 1998; 79(4): 2040 - 2062. [Abstract] [Full Text] [PDF]
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N. Suga, Y. Zhang, and J. Yan Sharpening of Frequency Tuning by Inhibition in the Thalamic Auditory Nucleus of the Mustached Bat J Neurophysiol, April 1, 1997; 77(4): 2098 - 2114. [Abstract] [Full Text] [PDF]
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 H Riquimaroux, S. Gaioni, and N Suga Cortical computational maps control auditory perception Science, February 1, 1991; 251(4993): 565 - 568. [Abstract] [PDF]
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N Suga, W. O'Neill, and T Manabe Harmonic-sensitive neurons in the auditory cortex of the mustache bat Science, January 19, 1979; 203(4377): 270 - 274. [Abstract] [PDF]
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J. Simmons, M. Fenton, and M. O'Farrell Echolocation and pursuit of prey by bats Science, January 5, 1979; 203(4375): 16 - 21. [Abstract] [PDF]
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A. Grinnell and P Brown Long-latency "subthreshold" collicular responses to the constant-frequency components emitted by a bat Science, December 1, 1978; 202(4371): 996 - 999. [Abstract] [PDF]
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N Suga, W. O'Neill, and T Manabe Cortical neurons sensitive to combinations of information-bearing elements of biosonar signals in the mustache bat Science, May 19, 1978; 200(4343): 778 - 781. [Abstract] [PDF]
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N Suga Amplitude spectrum representation in the Doppler-shifted-CF processing area of the auditory cortex of the mustache bat Science, April 1, 1977; 196(4285): 64 - 67. [Abstract] [PDF]
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N Suga and P. Jen Disproportionate tonotopic representation for processing CF-FM sonar signals in the mustache bat auditory cortex Science, October 29, 1976; 194(4264): 542 - 544. [Abstract] [PDF]
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