Perception de l'harmonicité et fusion harmonique chez l'adulte normo-entendant

Abstract : We are able to distinguish between two complex sounds (a vowel or a music note) produced at the same time, thanks to a particular acoustic phenomenon : the harmonic fusion. In other words, the listener is able to extract a single pitch from a set of harmonic components from the same sound source. The aim of this thesis is to understand the origin of pitch coding of complex sounds in the auditory system based on the detection of inharmonicity, and therefore the phenomenon of harmonic fusion, through two experiments. Two theories are commonly proposed to explain this coding ; one based on spatial clues and the other on temporal clues. We hypothesized that a temporal mechanism is involved in this coding. Results of experiment 1 indicates that when the auditory system is forced to use temporal information, we find an asymmetry in an inharmonicity detection task. On the other hand, these results could also be explained by the intervention of a spatial mechanism acquired before the birth until the first months of life. In experiment 2, the asymmetry of experiment 1 is found under all conditions except when the sound level is low and the sounds are antiphasic. This means that binaural system alone is able to detect an inharmonicity. This is new data, which adds to our understanding of harmonic fusion. Our study demonstrates that temporal mechanisms play the main role in inharmonicity detection phenomenon, without excluding other kinds of associated mechanisms. With our results in mind, fundamental research will continue to investigate this topic. Our research also has implications for the clinical practice of speech therapy. For example, it is possible to imagine auditory rehabilitation based on inharmonicity detection training in patients with hearing loss or cochlear implants, in order to improve their harmonic fusion capabilities and thus their speech understanding in a noisy environment.
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Caroline Duprat. Perception de l'harmonicité et fusion harmonique chez l'adulte normo-entendant. Sciences cognitives. 2018. ⟨dumas-02071297⟩

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