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Approche psychophysique des dissociations perception-action : effet de la détection de distracteurs au seuil sur l’atteinte de cibles visuelles

Abstract : The dominant position of a separation between a conscious vision for perception and an unconscious vision for action within the visual system has been particularly discussed in the last decades. The present dissertation is to be placed in the context of an alternative approach consisting in evaluating jointly both perceptual and motor responses in the presence of near-treshold visual stimuli. Previous work within this framework, which have mainly concerned reaction times, have contributed to develop a psychophysical model in which perceptual and motor decision are taken relatively to the same single incoming signal but are based on different tresholds. The three studies conducting during this PhD aimed to testing these proposals in experiments involving manual motor control. While confirming the strong link between perceptual and motor processing within the visual system, the results obtained in these studies underlined the importance of experimental parameters such as the contrast of the stimuli and the presence of visual masks. These results are congruent with neurophysiological models of visual masking, which postulate that the neural response to a visual stimulus is composed of a transient feedforward sweep of activation related to the presence of as stimulus and recurrent feedback loops linked to the conscious perception of this stimulus. Our work also led to the adaptation to manual motor control of the single signal decisional model initially developed on the basis of reaction time studies.
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Antoine Deplancke. Approche psychophysique des dissociations perception-action : effet de la détection de distracteurs au seuil sur l’atteinte de cibles visuelles. Psychologie. Université Charles de Gaulle - Lille III, 2012. Français. ⟨NNT : 2012LIL30033⟩. ⟨tel-00869965⟩

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