Persistence of past stimulations: Storing sounds within the inner ear

Jiefu Zheng, Sripriya Ramamoorthy, Tianying Ren, Wenxuan He, Dingjun Zha, Fangyi Chen, Anna Magnusson, Alfred L. Nuttall, Anders Fridberger

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Tones cause vibrations within the hearing organ. Conventionally, these vibrations are thought to reflect the input and therefore end with the stimulus. However, previous recordings of otoacoustic emissions and cochlear microphonic potentials suggest that the organ of Corti does continue to move after the end of a tone. These after-vibrations are characterized here through recordings of basilar membrane motion and hair cell extracellular receptor potentials in living anesthetized guinea pigs. We show that after-vibrations depend on the level and frequency of the stimulus, as well as on the sensitivity of the ear. Even a minor loss of hearing sensitivity caused a sharp reduction in after-vibration amplitude and duration. Mathematical models suggest that after-vibrations are driven by energy added into organ of Corti motion after the end of an acoustic stimulus. The possible importance of after-vibrations for psychophysical phenomena such as forward masking and gap detection are discussed.

Original languageEnglish (US)
Pages (from-to)1627-1634
Number of pages8
JournalBiophysical Journal
Issue number7
StatePublished - Apr 6 2011

ASJC Scopus subject areas

  • Biophysics


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