Abstract:
:Frequency tuning within the auditory papilla of most non-mammalian species is electrical, deriving from ion-channel resonance within their sensory hair cells. In contrast, tuning within the mammalian cochlea is mechanical, stemming from active mechanisms within outer hair cells that amplify the basilar membrane travelling wave. Interestingly, hair cells in the avian basilar papilla demonstrate both electrical resonance and force-generation, making it unclear which mechanism creates sharp frequency tuning. Here, we measured sound-induced vibrations within the apical half of the chicken basilar papilla in vivo and found broadly-tuned travelling waves that were not amplified. However, distortion products were found in live but not dead chickens. These findings support the idea that avian hair cells do produce force, but that their effects on vibration are small and do not sharpen tuning. Therefore, frequency tuning within the apical avian basilar papilla is not mechanical, and likely derives from hair cell electrical resonance.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Xia A,Liu X,Raphael PD,Applegate BE,Oghalai JSdoi
10.1038/ncomms13133subject
Has Abstractpub_date
2016-10-31 00:00:00pages
13133issn
2041-1723pii
ncomms13133journal_volume
7pub_type
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