| Autor: |
Lenhardt, M. L. |
| Zdroj: |
Journal of the Acoustical Society of America; 1984, Vol. 75 Issue S1, pS81-S81, 1p |
| Abstrakt: |
A startle to acoustic stimulation is a primitive indication of hearing in vertebrates. Turtles have not been shown to startle to airborne sounds but do exhibit this reflex when audio frequencies are applied directly to the shell. Evoked responses were recorded to airborne and vibratory clicks using needle electrodes. Both stimuli yielded similar waveforms, with the exception of a slight time delay due to propagation in bone. When equated for equal latencies the vibratory stimuli seemingly had a greater dynamic range. Simultaneous stimulation with white noise masking in the other modality further suggested preferential response of the ear to vibratory stimuli. Somatosensory input was controlled by anesthetic manipulation of the vertebral column at C1. The results indicate that the turtles are more sensitive to vibrations than airborne sound and bone conduction may be the preferred route to the ear. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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