Revealing deterministic structures in click-evoked otoacoustic emissions

Click-evoked otoacoustic emissions (CEOAEs) were studied by means of recurr ence quantification analysis (RQA) and were found to be endowed with a rele vant amount of deterministic structuring. Such a structure showed highly si gnificant correlation with the clinical evaluation of the signal over a dat a set including 56 signals. Moreover, 1) one of the RQA variables, Trend, w as very sensitive to phase transitions in the dynamical regime of CEOAEs, a nd 2) appropriate use of principal component analysis proved able to isolat e the individual character of the studied signals. These results are of gen eral interest for the study of auditory signal transduction and generation mechanisms.