Description
Date depot: 1 janvier 1900
Titre: Impact of healthy ageing on visual perceptual functions. A combined psychophysics and modelling study
Encadrant :
Rémy ALLARD (Non relevant)
Domaine scientifique: Sciences et technologies de l'information et de la communication
Thématique CNRS : Non defini
Resumé:
Healthy aging alters all processing levels of the visual system, such as optics of the eye, retinal processing, early pre-attentive processing, and high-level attention-based processing. These alterations affect many visual functions such as visual acuity, contrast sensitivity, motion perception and visual attention.
The overall objective of this project is to characterize the age-related sensitivity losses on various visual functions and identifying the underlying functional and neurobiological alterations responsible for these perceptual losses. We will address these questions through experimental psychophysics by using the external noise paradigm, which enables the factorization of the sensitivity into internal equivalent noise and calculation efficiency. Our first objective is to characterize the effect of aging on cortical noise limiting contrast sensitivity at high spatial frequencies under bright conditions (e.g., daylight). The major aim of the study is to determine whether the effect of aging on a particular function is due to an increase in internal noise or a decrease in processing efficiency.
Doctorant.e: Silvestre Daphne