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Perception des visages et formation d'impressions sur les personnes: etudes en EEG-MEG chez l'homme adulte sain| old_uid | 8722 |
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| title | Perception des visages et formation d'impressions sur les personnes: etudes en EEG-MEG chez l'homme adulte sain |
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| start_date | 2010/05/18 |
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| schedule | 12h-13h30 |
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| online | no |
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| summary | A fundamental property of the peripheral auditory system is to operate as a kind of frequency analyzer. Because of their obligatory role in determining the nature of any further processing, much effort has gone into characterizing the role of these “auditory filters.” One evident role is to resolve spectral peaks in the speech signal. This role is consistent with the traditional Fourier-based approach to speech understanding, in which speech information is conveyed by the distribution of energy along the audio-frequency axis. Over the past three decades, however, evidence has accumulated to show that the ear’s ability to resolve spectral contrasts is much larger than would be required to understand speech in quiet. These considerations have led to the suggestion that a primary function of the ear’s fine spectral resolution is to support the segregation of simultaneous acoustic signals.
During this presentation, a new model of speech recognition in noise in which the ear’s fine spectral resolution plays a critical role will be described. First, I will discuss how the auditory system takes advantage of several properties inherent to natural sounds to reconstruct an internal representation of the target – speech – signal. Then, a series of data supporting the model will be presented. Finally, some implications for our understanding of the mechanisms underlying poorer-than-normal speech recognition in noise in listeners with sensorineural hearing loss will be discussed. |
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| responsibles | <not specified> |
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