Avian species differences in susceptibility to noise exposure

摘要: Previous studies of hair cell regeneration and hearing recovery in birds after acoustic overstimulation have involved relatively few species. Studies the effects overexposure typically report high variability. Though it is impossible to tell, data so far also suggest there may be considerable species differences degree damage time course extent recovery. To examine this issue, we exposed four (quail, budgerigars, canaries, zebra finches) identical conditions systematically analyzed changes sensitivity, basilar papilla morphology, number. Quail budgerigars showed greatest susceptibility threshold shift loss with either pure tone or bandpass noise, while types canaries finches resulted much less a smaller, more diffuse loss. All some sensitivity number over time. Canary finch recovered within normal limits quail continued an approximately 20 dB incomplete In final experiment, were wide-band noise under artificial middle ear ventilation. Hair was substantially increased both suggesting that air pressure regulation correlated transfer function are one factor influencing small birds.