Healthy Volunteer Clinical Trial
Official title:
Brain Bases of Visual Perceptionnatural Scenes of Natural Scenes.
Using the available data from psychophysics, cellular electrophysiology and functionnal
neuroanatomy of visual pathway, current models of visual recognition suppose that the
perception of scenes start with a parallel extraction of differents elementary visual
characteristics to different spatial frequencies according to a default processing principle
named : 'coarse-to-fine'.
According to this principle, the visual scene's analysis would be decomposed in two steps.
Fisrt, the fast analysis of the global information borne by low frequency of the scene will
provide an overview of the scene's structure and would enable a first perceptive
categorisation which would be then refined, approved or denied by the latest analysis of the
most local, detailed and precise information, carried by the very high spatial frequency of
the scene.
The research carried out since several years is preparing a biologically plausible model and
to find brain bases by different imaging techniques among healthy subjects but also patients
with a brain lesion and patients with a peripheral lesion.
The main goal of this Magnetic Resonance Imaging study is to find brain bases of natural
scenes's visual perception of the natural scenes.
Three studies in Magnetic Resonance Imaging will be conducted, during which subjects will
have to categorize pictures of natural scenes filtered in spatial frequencies. The outcome
of this study will allow to refine models of visual recognition, most of them based on
analysis of spatial frequencies.
n/a
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