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Original Article

Temporary Threshold Shifts for Masked Pure Tones: II. Broad-Band Masker

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Pages 325-335 | Published online: 07 Jul 2009
 

Abstract

The amount of temporary threshold shift (TTS) measured in a particular individual is dependent on several factors. One such factor is the pre-exposure hearing level of the subject. In this study, the contribution of this factor to the measured TTS was examined in 8 normal-hearing subjects. TTS measurements were made in unmasked and masked conditions following a 4-hour exposure to noise. The masked condition was designed to simulate a flat mild hearing loss. Results indicated that TTS observed under conditions of broad-band masking was reduced as compared to TTS for the unmasked condition. The results, moreover, were consistent with the predictions of a model developed previously from earlier research with narrow-band maskers.

L'importance du glissement temporaire du seuil (TTS) dépend de plusieurs facteurs parmi lesquels nous avons retenu le niveau d'audition avant exposition. Nous avons effectué sur 8 sujets normaux des mesures de TTS après 4 h d'exposition à un bruit de restaurant en présence et en l'absence d'un bruit masquant continu. Les résultats montrent que le TTS était plus bas en présence de bruit masquant (simulant une perte d'audition plate légère) qu'en son absence. Nos résultats coïncident avec les prévisions que nous avions faites sur la base d'un modèle réalisé précédemment avec des masquages à bande étroite.

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