Seminario Teorico: Arturo Moleti

15 June, 2018 - 14:30 - 15:30
Aula Grassano

Prof. Arturo Moleti (Università di Roma - Tor Vergata)

Title: Predicting the phenomenology of human hearing with scaling-symmetrical nonlinear active cochlear models

Abstract: The remarkable properties of human hearing in terms of threshold sensitivity, frequency resolution and dynamical range are all satisfactorily explained by 1-dimensional nonlinear active models of the mammalian cochlea, which is the sensory organ capable of performing high-resolution acoustic spectroscopy of complex sounds. Scaling symmetry (cochlear physics is independent of frequency) provides mathematical constraints leading to model-independent predictions about the mathematical relation between observable quantities. Among these observable quantities, otoacoustic emissions (OAEs), backward acoustic signals generated in the cochlea and measured in the ear canal, are those measurable with the best signal to noise ratio (20-40 dB); therefore they allow accurate tests of the mathematical properties of cochlear models, including scaling symmetry and its violations, and the functional form of the model nonlinearity. After a brief introduction to the mechanics of hearing, experimental evidence will be provided supporting the consistency of the proposed schematization.