Patients with auditory neuropathy/dyssynchrony exhibit no auditory brain stem response (ABR), no middle ear muscle response, and both normal otoacoustic emissions or normal cochlear microphonics. An absent or grossly abnormal ABR is not always associated with deafness. In contrast, a hearing loss of 30 dB or more usually predicts absent otoacoustic emissions, but normal emissions can be seen in...

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...

INTRODUCTION The medial olivocochlear bundle effect is studied through the suppression of otoacoustic emissions and seems to be influenced by the laterality of the central nervous system, presenting no symmetry between right and left ear. A dysfunction of this bundle may be involved in the generation of tinnitus, although this fact was not confirmed. OBJECTIVES Study the suppression of distor...

The development and application of otoacoustic emissions in clinical practice marked the beginning of a new era in the field of screening for congenital hearing loss. In particular, transient evoked otoacoustic emissions (TEOAEs) have been widely adopted by many universal hearing screening (UNHS) programs. The test is quick, non-invasive, objective, sensitive, frequency specific, relatively che...

Buus and Florentine (ISP meeting 2001) presented evidence that basilar-membrane velocity growth functions are proportional to the square root of loudness functions derived from temporal and spectral integration. Although it is not possible to directly measure basilarmembrane activity in humans, it is likely that tone-burst otoacoustic emission input-output functions, at least at low and moderat...

UNLABELLED Smoking is a public health concern and we are still unsure of its relation with auditory problems. AIM To study the effects of cigarette smoking in auditory thresholds, in otoacoustic emissions and in their inhibition by the efferent olivocochlear medial system. MATERIALS AND METHODS 144 adults from both genders, between 20 and 31 years of age, smoking and non-smoking individuals...

UNLABELLED Audiological evaluation in infants should include the middle ear (immitance measures and otoscopy) and also a cochlear evaluation. AIM To check which tympanometry tone test (226 Hz or 1000 Hz), transient otoacoustic emissions and otoscopy. METHODS Transient otoacoustic emissions were taken from sixty infants ranging from zero to four months of age. The babies were assigned to two...

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