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Results for “NERVES, ACOUSTIC”

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At least 217 records · Page 12Linked to original sources

PubMed1998

Detectability of cochlear, acoustic nerve and brainstem potentials in a group of 'normal' preterm newborns recorded with insert earphone.

Thirty-four 'normal' preterm newborns were tested at 40 weeks postconceptional age. To separate electromagnetic artifacts from cochlear potentials and subsequent auditory brainstem responses, a test was given using an insert earphone at 90, 70, 50, 30 dB nHL. The detectability of receptor potentials, waves I, III, V, as a function of stimulus intensity is described: at 90 dB nHL exclusively, we could always identify these peaks because of the better morphological distinctiveness of each potential. When trying to evaluate the acoustic pathway in premature newborns, we suggest that brainstem response audiometry should be performed at 90 dB nHL with an insert earphone.

Acoustic Stimulation↗

PubMedDate not supplied

[Neurinomas of the acoustic nerve in childhood and adolescence].

The specific features of neurinoma of the auditory nerve were analysed clinically in 21 patients whose ages ranged from 12 to 18 years. Neurinoma of the auditory nerve located in the cerebellopontine area in children and adolescents has some specific features distinguishing it from that in adults. For instance, its incidence among boys is the same as that among girls. In most patients the neurinomas grew medially and orally, which caused gradual development of hydrocephalic-hypertensive symptoms and only in the far advanced stage of the disease did local symptoms in the form of affection of the trigeminal and facial nerves develop in attendance to them.

Adolescent↗

PubMedDate not supplied

[Simulation of spontaneous discharge and short-term adaptation in acoustic nerve fibers].

A model for firing of the auditory nerve fibres was carried out on a general purpose digital computer. In the model a noise with small correlation time and with assigned standard deviation (when modeling a spontaneous discharge) or a sum of a noise and a determinated signal (when modeling an elicited discharge) is compared with incremental threshold. When the threshold is exceeded a spike occurs and the threshold is increased. The threshold qualitative properties and quantitative values were chosen in a way to provide the most reliable patterns of spontaneous discharge, according to the literature data obtained from the cat's auditory nerve. When stimulated by tone-bursts the model reveals intrinsic ability of mimicking the phenomena of discharge rate short-term adaptation. Thus according to our model the short-term adaptation is entirely due to the properties of the incremental threshold.

Acoustic Stimulation↗

PubMed1987

[Complex frequency-selective properties of the fibers of the acoustic nerve in the pigeon].

Frequency-selectivity properties of 198 single auditory fibres in the pigeon were investigated by means of an automatic method. Spontaneous activity in 56 of them innervating hair cells with oscillatory membrane potential changes could be inhibited by single-frequency stimuli (one-tone inhibition). Inhibition areas lay above (45%), below (7%) or on both sides (48%) of their characteristic frequencies (CFs). Input-output functions at inhibitory frequencies were nonmonotonic, while they were always monotonic at best frequencies near CF. One-tone inhibition was not observed in the remaining 142 fibres. Analysis of mechanoelectric processes in hair cells during one-tone inhibition indicates their possible analogy with the well known two-tone effects.

Acoustic Stimulation↗

PubMed1969