A study of Click Evoked Otoacoustic Emissions (CEOAEs) elicited at stimulation intensities from 35 to over 80 dB was carried out by Recurrence Quantification Analysis (RQA) on signals from both normal and hearing impaired subjects. In normal subjects, a clear scaling of determinism with increasing stimulation intensity was observed in the click intensity range from 41 to 59 dB. Outside that range and, in particular, above its upper end, subject-dependent features appeared in the form of different maximal levels of determinism. A comparative analysis of responses from hearing impaired subjects with conductive hearing losses and sensorineural hearing losses suggested that the principal contributor to this behavior is the middle ear and allowed to discriminate the two pathologies solely on the basis of CEOAEs. These observations are consistent with a simple phenomenological model of the auditory periphery in which different functional modules are sequentially recruited at increasing stimulus intensities, with a consequent rise in CEOAEs coherence.
Otoacoustic emissions at different click intensities: invariant and subject-dependent features / Zimatore, G.; Giuliani, A.; Hatzopoulos, S.; Colosimo, Alfredo. - In: JOURNAL OF APPLIED PHYSIOLOGY. - ISSN 8750-7587. - STAMPA. - 95:(2003), pp. 2299-2305. [10.1152/j.applphysiol.00667.2003]
Otoacoustic emissions at different click intensities: invariant and subject-dependent features
COLOSIMO, Alfredo
2003
Abstract
A study of Click Evoked Otoacoustic Emissions (CEOAEs) elicited at stimulation intensities from 35 to over 80 dB was carried out by Recurrence Quantification Analysis (RQA) on signals from both normal and hearing impaired subjects. In normal subjects, a clear scaling of determinism with increasing stimulation intensity was observed in the click intensity range from 41 to 59 dB. Outside that range and, in particular, above its upper end, subject-dependent features appeared in the form of different maximal levels of determinism. A comparative analysis of responses from hearing impaired subjects with conductive hearing losses and sensorineural hearing losses suggested that the principal contributor to this behavior is the middle ear and allowed to discriminate the two pathologies solely on the basis of CEOAEs. These observations are consistent with a simple phenomenological model of the auditory periphery in which different functional modules are sequentially recruited at increasing stimulus intensities, with a consequent rise in CEOAEs coherence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.