Universität zu Köln

Baljic, Izet, Esser, Dirk, Foerst, Astrid and Walger, Martin (2017). Evaluation of optimal masking levels in place-specific low-frequency chirp-evoked auditory brainstem responses. J. Acoust. Soc. Am., 141 (1). S. 197 - 207. MELVILLE: ACOUSTICAL SOC AMER AMER INST PHYSICS. ISSN 1520-8524

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Abstract

The aim of the study is the experimental determination of the optimal required masking level for a given stimulus level when using a band limited low-frequency chirp in order to improve frequency and place specificity of auditory brainstem responses (ABRs). A low-frequency chirp (100-850 Hz) at stimulation levels between 40 and 80 dB normalized hearing level was presented to 12 normal hearing subjects. During presentation of each stimulus, the level of a high-pass noise with a low cutoff frequency of 1100 Hz was varied between 0 and 25 dB signal-to-noise ratio (SNR) by using 5 dB steps (at 0 dB SNR the same level of both the chirp and the masker in dB sound pressure level was presented). Measurements without masking were used as a reference. In all masking conditions, the latency of wave V was significantly increased compared to unmasked ABRs. The amplitude of wave V decreased when reaching the effective and therefore optimal masking level. Accordingly, in order to ensure place specificity of the ABR, ipsilateral masking is essential. At lower stimulus levels the SNR can be substantially increased (i.e., the masker level decreased) without loss of place specificity. (C) 2017 Acoustical Society of America.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Baljic, Izet UNSPECIFIED UNSPECIFIED UNSPECIFIED Esser, Dirk UNSPECIFIED UNSPECIFIED UNSPECIFIED Foerst, Astrid UNSPECIFIED UNSPECIFIED UNSPECIFIED Walger, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-246827
DOI:	10.1121/1.4973517
Journal or Publication Title:	J. Acoust. Soc. Am.
Volume:	141
Number:	1
Page Range:	S. 197 - 207
Date:	2017
Publisher:	ACOUSTICAL SOC AMER AMER INST PHYSICS
Place of Publication:	MELVILLE
ISSN:	1520-8524
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-PASS NOISE; NOTCHED-NOISE; NORMAL-HEARING; POTENTIALS; THRESHOLDS; LATENCY; CLICKS; TONES; AUDIOMETRY; INTENSITY Multiple languages Acoustics; Audiology & Speech-Language Pathology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24682