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Visual pathways do not age Alleysson D.1*, Bordier C.2, Charnallet A.3, Dojat M.2, Fernandez F.1, Guyader N.4, Musel B.1, Peyrin C.1,
 

Summary: Visual pathways do not age
Alleysson D.1*, Bordier C.2, Charnallet A.3, Dojat M.2, Fernandez F.1, Guyader N.4, Musel B.1, Peyrin C.1,
Vizioz-Fortin L.1
1 Laboratory of Psychology & NeuroCognition (LPNC) / UPMF / CNRS UMR5105 / 38040 GRENOBLE
2 Grenoble Institute of Neuroscience (GIN) / UJF / INSERM U836 / 38700 GRENOBLE
3 Psychiatry & Neurology Department / CHU Grenoble / 38042 GRENOBLE
4 Grenoble Image Speech Signal Automatism (Gipsa) / UJF, INPG, UPMF / CNRS UMR 5216 / 38402 GRENOBLE
In 1997, Pokorny & Smith developed a psychophysical method to preferentially stimulate either the parvocellular (P) or the magnocellular (M) pathways. This method
provides a powerful tool to study potential visual impairments of visual pathways. Their stimuli were based on the luminance contrast gain differences between the
two pathways and the mode of presentation of stimuli changes depending on the channel, M or P, to preferentially stimulate. This rules out controversial results
found when P and M are stimulated following their color and/or spatial-temporal sensitivities. In this study, we tested whether normal ageing has an effect on M and P
pathways. We used the described method to measure contrast thresholds in two populations differing in age (27 vs 60 year old).
Observers : we studied 2 groups of
observers: a group of young
observers and a group with older
people.
Young adults: 16 observers aged 20
to 33 years (mean 27 year old).
Old adults: 20 observers aged 50 to
64 years (mean 56.5 ± 4.27 year old)

  

Source: Alleysson, David - Laboratoire de Psychologie et NeuroCognition, Université Pierre Mendes France

 

Collections: Biology and Medicine