Who Are You Listening to? Towards a Dynamic Measure of Auditory Attention to Speech-on-speech
Résumé
When studying speech-on-speech perception, even when participants are explicitly instructed to focus selectively on a single voice, they can spuriously find themselves listening to the wrong voice. These paradigms generally do not allow to infer, retrospectively, which of the speakers was listened to, at different times during presentation. The present study sought to develop a psychophysical test paradigm, and a set of speech stimuli to that purpose. In this paradigm, after listening to two simultaneous stories, the participant had to identify, among a set of words, those that were present in the target story. Target and masker stories were presented dichotically or diotically. F0 and vocal-tract length were manipulated in order to parametrically vary the distance between the target and masker voices. Consistent with the hypothesis that correct-identification performance for target words depends on selective attention, performance decreases with the distance between the target and masker voices. These results indicate that the paradigm and stimuli described here can be used to infer which voice a participant is listening to in concurrent-speech listening experiments.
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