Methodik und diagnostischer Stellenwert der Notched-Noise-BERA

Abstract

The NN-BERA faces a growing competition by auditory steady state potentials, chirp-evoked potentials, and distortion product otoacoustic emissions but serves still as the standard for an objective threshold estimation since it's accuracy is well evaluated and the interpretation is independent from statistical tests which accuracy is not sufficiently evaluated at present.

Aktuelle audiologische Diagnostik

“…Einer der zahlreichen Ansätze beruht auf der Stimulation mit kurzen Tonpulsen und gleichzeitiger Maskierung mit kerbgefiltertem Breitbandrauschen (Notched-Noise-BERA). Die mit diesem Verfahren erhaltenen Reizantworten können für Frequenzen zwischen 500 Hz und 4 kHz in vielen Fällen -insbesondere für die Prüffrequenzen 2 und 4 kHz -bis in die Nähe der Hörschwelle nachgewiesen werden [264][265][266]. Den Eigenschaften der cochleären Wanderwelle entsprechend sind die Latenzzeiten der Antworten länger für niedrige als für hohe Frequenzen.…”

Current audiological diagnostics

“…One of the numerous approaches is based on stimulation with short tone bursts and simultaneous masking with notched-filtered broadband noise (notched-noise-BERA). The responses obtained with this procedure can generally be measured for frequencies between 500 Hz and 4 kHz – especially for the test frequencies of 2 and 4 kHz – nearly down to the hearing threshold [ 264 ], [ 265 ], [ 266 ]. According to the properties of the cochlear travelling wave, the latency times of the responses are longer for lower than for higher frequencies.…”

Hearing impairment and language delay in infants: Diagnostics and genetics

“…The notched-noise BERA allows the frequency to be determined at 0.5, 1, 2 and 4 kHz [ 45 ]. However, in the 500-Hz range it does not reliably approach the hearing threshold, especially if hearing impairment is mild and the scatter range is high [ 46 ], [ 47 ], [ 48 ]. The low-frequency range can be more reliably tested using the low chirp , but scattering is also high using this method.…”