Cochlear microphonic potentials (CM) were recorded from the cochlear aqueduct ofRhinolophus rouxi in response to vocalizations and artificial stimuli.
Vocal self-stimulation was evaluated by comparing the amplitude of the vocalization-induced CM to the calibration curve of the CM determined with artificial stimuli. The equivalent sound pressure level for self-stimulation at the resting frequency of the bat ranged between 78 and 83 dB SPL.
The same value of self-stimulation was obtained when we measured the maximum amplitude of beats produced by interference between acoustic self-stimulation and a slightly frequency shifted (500 Hz) playback signal.
Middle ear muscle (MEM) contractions occurred in synchrony with vocalizations even though the vocal self-stimulation level was below the threshold for the acoustic MEM reflex. The vocalization-induced MEM contractions had little effect on energy transfer to the inner ear for frequencies around the resting frequency but led to a reduction of the response at lower frequencies.
The importance of the vocal self-stimulation for different behavioural conditions of echolocation in CF-FM bats is discussed.
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- AS :
- CM :
- MEM :
middle ear muscles
- CF :
- FM :
- RF :
- SPL :
sound pressure level
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Pietsch, G., Schuller, G. Auditory self-stimulation by vocalization in the CF-FM bat,Rhinolophus rouxi . J. Comp. Physiol. 160, 635–644 (1987). https://doi.org/10.1007/BF00611936
- Calibration Curve
- Energy Transfer
- Pressure Level
- Maximum Amplitude
- Sound Pressure