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    Catégorie de document Article paru dans une revue
    Titre Perceptual attenuation of nonfocused auditory streams
    Auteur principal Marie-Claire Botte
    Co-auteurs Carolyn Drake, Renaud Brochard, Stephen McAdams
    Paru dans Perception and Psychophysics 1997, Vol. 59
    Comité de lecture Oui
    Collation p.419-425
    Copyright Psychonomic Society, Inc
    Année 1997
    Statut éditorial Publié
    Résumé

    The aim of this study was to measure the perceptual attenuation, measured in decibels, resulting from the focusing of attention on one stream within a multi-stream auditory sequence. The intensity of a non-focused stream was increased until the accuracy of detecting a temporal irregularity in this stream was the same as in a focused stream. Eight subjects were required to detect a temporal irregularity created by delaying or advancing one tone which could be situated in one of three temporally regular streams played simultaneously to create a multi-stream sequence. The three streams differed in tempo and frequency. Subjects' attention was focused on one of the streams by preceding the multi-stream sequence with one of the single streams (a cue). We first established the size of temporal irregularity detected at a 90% level in cued streams, confirming that subjects were able to focus on one particular stream. Second, an irregularity of this size was not detected above chance level in non-cued streams, demonstrating that listeners only focus on the cued stream. Third, for five subjects, a 15 dB increase in the level of one of the non-cued streams was necessary to bring detection up to that found in the cued streams. This gain provides an equivalent measure of the perceptual attenuation of non- focused streams. For three other subjects, detection in the non-cued stream remained at chance performance whatever the level. For all subjects, detection in the cued stream decreased slightly as the level of the non-cued stream increased. We conclude that the attenuation of non-focused auditory streams can attain as much as 15 dB, at least for some subjects.

    Mots-clés auditory streaming / attention / loudness
    Equipe Perception et cognition musicales
    Cotes Botte97a / 97-122-BOT-PER-VIN-PCM

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