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Theses

Contraintes temporelles des traitements visuels dans une tâche de catégorisation de scènes naturelles

Abstract : The different experiments of this thesis focused on a categorisation task in which subjects have to
initiate response on the basis of incomplete visual information. The use of a masking paradigm
allowed us to decompose through time the visual processing implicated in objet recognition.
Results of these experiments not only confirmed that visual processing is extremely robust and
fast (Chapter 2), but also demonstrated that the accumulated sensory information could be
transformed into a decisional signal to efficiently guide the response, depending on the motor
effector (manual or ocular – Chapter 3) or the level of representation required in the task
(Detection – Categorisation – Identification – Chapter 4). About 40-50 ms appear to be sufficient
to integrate the most pertinent information on the stimulus to perform an animal/non-animal task
and this latency can be even shorter while categorising faces of famous people. This delay is
compatible with the idea that objet recognition is intially based on the rapid transfer of visual
information through the visual system, in a feed-forward and massively parallel way.
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https://tel.archives-ouvertes.fr/tel-00102319
Contributor : Catherine Marlot <>
Submitted on : Friday, September 29, 2006 - 4:31:10 PM
Last modification on : Tuesday, December 1, 2020 - 11:28:02 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 1:18:07 AM

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  • HAL Id : tel-00102319, version 1

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Nadège Bacon-Macé. Contraintes temporelles des traitements visuels dans une tâche de catégorisation de scènes naturelles. Neurosciences [q-bio.NC]. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00102319⟩

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