Covert attention affects the psychometric function of contrast sensitivity
Covert attention affects the psychometric function of contrast sensitivity
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DOI：
10.1016/s0042-6989(02)00039-1
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发表时间：
2002-04-01
期刊：
影响因子：
1.8
通讯作者：
Carrasco, M
中科院分区：
文献类型：
--
作者：
Cameron, EL;Tai, JC;Carrasco, M
我们研究了在没有干扰物和视觉掩蔽物的情况下，目标单独呈现时，瞬时内隐注意对方向辨别任务中对比敏感度心理测量功能的影响。短暂的内隐注意力降低了阈值（与对比度增益机制一致），并不一致，心理测量功能的斜率。我们评估了8个等距位置（4.5度偏心）的表现，发现阈值和斜率取决于目标位置-垂直子午线上的阈值和斜率都高于水平子午线，特别是直接固定。所有的影响是强大的在一系列的空间频率，和视野不对称性增加的空间频率。尽管心理测量函数依赖于目标位置。注意力在整个视野中的表现也有类似的改善。在这项研究中，我们排除了所有的外部噪声源，我们的实验表明，空间的不确定性不能解释目前的结果，我们得出的结论是，观察到的注意力的好处是一致的信号增强。(C)2002爱思唯尔科技有限公司。保留所有权利。
We examined the effect of transient covert attention on the psychometric function for contrast sensitivity in an orientation discrimination task when the target was presented alone in the absence of distracters and visual masks. Transient covert attention decreased both the threshold (consistent with a contrast gain mechanism) and, less consistently, the slope of the psychometric function. We assessed performance at 8 equidistant locations (4.5degrees eccentricity) and found that threshold and slope depended on target location-both were higher on the vertical than the horizontal meridian, particularly directly abode fixation. All effects were robust across a range of spatial frequencies, and the Visual field asymmetries increased with spatial frequency. Notwithstanding the dependence of the psychometric function on target location. attention improved performance to a similar extent across the visual field.Given that. in this study, we excluded all sources of external noise, and that we showed experimentally that spatial uncertainty cannot explain the present results, we conclude that the observed attentional benefit is consistent with signal enhancement. (C) 2002 Elsevier Science Ltd. All rights reserved.