The relative capabilities of the upper and lower visual hemifields
The relative capabilities of the upper and lower visual hemifields
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DOI：
10.1016/j.visres.2005.04.001
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发表时间：
2005-10-01
期刊：
影响因子：
1.8
通讯作者：
McAnany, JJ
中科院分区：
文献类型：
--
作者：
Levine, MW;McAnany, JJ
对于许多类别的刺激，视觉表现在下视觉半野中比在上视野中更好。这种差异的起源尚不清楚。有一种理论认为，这与较低视野中的细粒度注意力有关，这一观点与任务难度相关的相对效能变化相一致。在这项研究中的第一个实验证实了较低的半场优势，区分一系列的刺激，包括那些不同的对比度，色调和运动。一个相同的范例显示了上场优势时，刺激不同，从观察者的明显距离。在上半野或下半野的刺激呈现被交错以减少可能的伪影或偏差的可能性。第二个实验改变了这些歧视的难度，表明难度并不能决定领域的偏好。因此，注意力机制并不是这些偏好的可能解释。(c)2005 Elsevier Ltd.保留所有权利。
Visual performance is better in the lower visual hemifield than in the upper field for many classes of stimuli. The origin of this difference is unclear. One theory associates it with finer-grained attention in the lower field, an idea consistent with a change in relative efficacy with task difficulty. The first experiment in this study confirmed a lower hemifield advantage for discriminating a range of stimuli, including those that differ in contrast, hue, and motion. An identical paradigm revealed an upper field advantage when stimuli differed in their apparent distances from the observer. Presentations of stimuli in the upper or lower hemifield were interlaced to reduce the likelihood of possible artifacts or biases. A second experiment varied the difficulty of these discriminations, showing that difficulty does not determine field preference. Thus, an attentional mechanism is not a likely explanation for these preferences. (c) 2005 Elsevier Ltd. All rights reserved.