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J Appl Physiol 92: 2521-2528, 2002. First published January 4, 2002; doi:10.1152/japplphysiol.01163.2001
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Vol. 92, Issue 6, 2521-2528, June 2002

Comparison of transient otoacoustic emission responses from neonatal and adult ears

Giovanna Zimatore1, Stavros Hatzopoulos2, Alessandro Giuliani3, Alessandro Martini2, and Alfredo Colosimo1

1 Department of Human Physiology and Pharmacology, University of Rome La Sapienza, 00185 Rome; 2 Center of Bioacoustics, University of Ferrara, 44100 Ferrara; and 3 Istituto Superiore di Sanità, TCE Laboratory, 00161 Rome, Italy

Transient otoacoustic emission (TEOAE) responses from neonatal (age: 48 h) and adult subjects (age: 26.6 ± 10.0 yr) were analyzed by the combined use of recurrence quantification analysis and singular value decomposition. The data from the two age groups showed significant differences and similarities. The neonatal responses presented less deterministic structures than those of the adults in terms of recurrent dynamic features. In both data sets, the same high level of individual specific dynamic features was observed. The results from the singular value decomposition analysis suggest that a large percentage of variability in all of the analyzed responses can be explained by four to five essential modes. This number is lower than that observed in simulated TEOAE responses generated by a five-component gammatone model. A possible explanation is presented, based on simple instrumental and morphoanatomic considerations.

hearing physiology; otoacoustic emissions; nonlinear methods; principal component analysis; singular value decomposition; gammatones


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