| Autor: |
Jen, P. H.-S., Alster, H., Suga, N. |
| Zdroj: |
Journal of the Acoustical Society of America; 1975, Vol. 57 Issue S1, pS42-S42, 1p |
| Abstrakt: |
The middle-ear muscles contract synchronously with the emission of orientation sounds and attenuate vocal self-stimulation. Apparently the vocalization center activates the middle-ear and laryngeal muscles in a coordinated manner for echolocation. With Myotis lucifugus, further experiments were performed on the coordinated activities of the crichothyroid (CTM) and stapedius muscles (SM) for vocalization and attenuation of vocal self-stimulation. We have also found that both the SM and CTM responded to acoustic stimuli. The CTM discharged action potentials to acoustic stimuli with a latency of 11 msec on the average. The shortest latency of the reflex was 8.0 msec, which was 4.6 msec longer than that of the acoustic SM reflex. Unlike SM fibers, tuning curves of CTM fibers were a simple triangle. The best frequencies ranged between 25 and 40 kHz and the Q-10-dB values ranged between 2 and 5. The lowest threshold measured was 50 dB SPL. [Supported by NSF Grant GB-40018.] [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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