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Title: Development and aging of visual hemifield asymmetries in contrast sensitivity
Authors: Silva, Maria Fátima 
d'Almeida, Otília C. 
Oliveiros, Bárbara 
Mateus, Catarina 
Castelo-Branco, Miguel 
Keywords: contrast sensitivity; development; aging; visual field; asymmetry
Issue Date: 17-Oct-2014
Publisher: Association for Research in Vision and Ophthalmology
Project: SFRH/BPD/72029/2010 
SFRH/BD/ 64306/2009 
Aging Program of the Calouste Gulbenkian Foundation 
PEst-C/SAU/UI3282/2013, CENTRO- 07-ST24-FEDER-00205 
Serial title, monograph or event: Journal of Vision
Volume: 14
Issue: 12
Abstract: The relation of development and aging with models of visual anisotropies and their influence on low-level visual processing remain to be established. Our main goal was to explore visual performance asymmetries in development and normal aging using low-level contrast sensitivity behavioral tasks [probing two distinct spatiotemporal frequency channels, (a) intermediate spatial and null temporal frequency (3.5 cycles per degree (cpd) and 0 Hz); and (b) low spatial and high temporal frequency (0.25 cpd undergoing 25 Hz counterphase flicker)]. Different patterns of functional asymmetries were investigated within four (two neurodevelopmental and two adult) age groups (N = 258 participants; 8-65 years). We found a left visual hemifield/right hemisphere advantage for only the intermediate spatial frequency channel that was present early in life and remained stable throughout adulthood. In contrast, inferior/superior visual hemifield asymmetries, with a direct ecological meaning, were found for both spatiotemporal frequency channels. This inferior visual hemifield advantage emerged early in life and persisted throughout aging. These findings show that both right hemispheric and dorsal retinotopic patterns of dominance in low-level vision emerge early in childhood, maintaining during aging.
ISSN: 1534-7362
DOI: 10.1167/14.12.19
Rights: openAccess
Appears in Collections:I&D ICNAS - Artigos em Revistas Internacionais
I&D IBILI - Artigos em Revistas Internacionais
FMUC Medicina - Artigos em Revistas Internacionais

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