Audiologic assessment of infants and young children can be confounded by neurologic disorders or neuromaturational delays. In some cases, this results in an inability to assess hearing sensitivity by behavioral measures or by auditory evoked potentials. This case illustrates such an audiologic challenge. Subject DF was born with hydrocephaly, which was treated with repeated shunt surgeries and ...

Otoacoustic emissions (OAEs) are a class of acoustic signals that are generated in the cochlea and transmitted backward to the ear canal through the middle ear. This is attributed to the active nonlinear mechanism in the cochlea [Kemp 1978]. Distortion product otoacoustic emissions (DPOAEs) are a special type of OAEs generated in response to two pure tone acoustic stimuli with sound pressure le...

otoacoustic emissions (DPOAE) generated from the OHC of the organ of Corti. Temperature is controlled (within certain rigid limits) in warm-blooded animals including human beings. To investigate extreme hypothermia in our study we selected patients undergoing congenital open heart surgery where body temperature can be lowered over a large temperature interval. To monitor inner ear functions, we...

PURPOSE To determine cortical influence on the efferent medial olivocochlear bundle system. RESEARCH DESIGN The effects of attention on contralateral suppression (CS) of click-evoked otoacoustic emissions were measured. STUDY SAMPLE Fifteen normal-hearing listeners. RESULTS CS was greatest in the nonattending condition and decreased significantly when attending to the click or broadband n...

The association between contralateral stimulation and evoked otoacoustic emissions (EOAEs) allows study of sound-evoked olivocochlear feedback and then of the medial olivocochlear system. A method allowing quantification of sound-evoked olivocochlear feedback is proposed. The feedback is present in almost all normal-hearing subjects, but with great interindividual variability. In sensorineural ...