La discrimination de la durée d'intervalles vides et pleins

Abstract

Cette thèse étudie l'effet des événements marquant le début (On) et la fin (Off) des intervalles auditifs de courte durée sur la performance de la discrimination perceptive, afin d'apporter des nouvelles évidences sur le fonctionnement des mécanismes temporels. L'investigation de l'effet de la durée des bornes, de la structure temporelle des événements et de la durée de base sur la discrimination s'effectue par la comparaison des intervalles vides, pleins et gaps traditionnels (asymétriques) avec deux nouveaux types d'intervalles (symétriques) pour des durées de 50 ms à 1000 ms. Les résultats des expériences montrent une diminution de la performance en fonction de la durée des bornes de 20 ms à 300 ms à deux durée de base (50 ms et 1000 ms), une meilleure discrimination pour les intervalles vides que pour les intervalles pleins et gaps à quatre durées de base (50 ms, 250 ms, 500 ms, et 1000 ms), et une meilleure discrimination pour les intervalles asymétriques traditionels (On-Off et Off-On) comparativement aux intervalles symétriques (On-On et Off-Off). La conclusion générale qui s'imposent à partir de ces données se réfère au fait que pour la discrimination de la durée la symétrie-asymétrie de la strucure temporelle est plus importante que la nature des évenementes (On, Off) marquant les intervalles.

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This thesis studies the effect of events marking the beginning (On) and end (Off) of short auditory intervals on the performance of perceptual discrimination, in order to provide new evidence on the functioning of temporal mechanisms. The investigation of the effect of the duration of the terminals, the temporal structure of the events and the basic duration on the discrimination is carried out by comparing empty, full and traditional (asymmetric) intervals with two new types of intervals (symmetric) for durations of 50 ms to 1000 ms. The results of the experiments show a decrease in performance as a function of the duration of the terminals from 20 ms to 300 ms at two base durations (50 ms and 1000 ms), better discrimination for empty intervals than for full and gap intervals. at four basic durations (50 ms, 250 ms, 500 ms, and 1000 ms), and better discrimination for traditional asymmetric intervals (On-Off and Off-On) compared to symmetric intervals (On-On and Off-Off ). The general conclusion that emerges from these data refers to the fact that for duration discrimination the symmetry-asymmetry of the temporal structure is more important than the nature of the events (On, Off) marking the intervals.