Retinal and cortical patterns of spatial anisotropy in contrast sensitivity tasks

被引：42
|
作者：
Silva, Maria Fatima [1 ]
Maia-Lopes, Susana [1 ]
Mateus, Catarina [1 ]
Guerreiro, Manuela [1 ]
Sampalo, Joana [1 ]
Faria, Pedro [1 ]
Castelo-Branco, Miguel [1 ]
机构：
[1] Fac Med, IBILI, Visual Neurosci Lab, Ctr Opthalmol, P-3000354 Coimbra, Portugal
来源：
VISION RESEARCH | 2008年 / 48卷 / 01期
关键词：
contrast sensitivity; asymmetry; spatial vision; magnification factor; visual system; cerebral dominance; hemispheric specialization;
D O I：
10.1016/j.visres.2007.10.018
中图分类号：
Q189 [神经科学];
学科分类号：
071006 ;
摘要：
It has often been postulated that asymmetries in performance within the visual field (VF) are not characteristic of early visual processing. Here, human retinal (naso/temporal), cortical (left/right) and superior/inferior patterns of asymmetry were explored with achromatic contrast sensitivity (CS) tasks, that probed distinct spatiotemporal frequency channels. Low spatial, high temporal frequency stimuli (illusory frequency-doubling (FD)) yielded superior and temporal field disadvantage. Independent right and nasal visual hemifield patterns of disadvantage were found when probing an intermediate spatial frequency (ISF) channel, with stationary sinusoidal gratings. These findings show that asymmetries in spatial vision are explained by independent retinal and cortical mechanisms. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：127 / 135
页数：9
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