Covert attention increases spatial resolution with or without masks: support for signal enhancement.
Covert attention increases spatial resolution with or without masks: support for signal enhancement.
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DOI：
10.1167/2.6.4
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发表时间：
2002-01-01
影响因子：
1.8
通讯作者：
Yeshurun, Yaffa
中科院分区：
文献类型：
--
作者：
Carrasco, Marisa;Williams, Patrick E;Yeshurun, Yaffa
视觉注意可以提高空间分辨率，即使它导致性能下降。这种效应是通过减少外部噪声还是通过增强信号来介导的，这是一个尚未解决的问题。虽然我们以前证明了注意力可以提高敏锐度任务的速度和准确性，但这些实验使用了局部后掩蔽，这可以被认为是外部噪声的来源。在这项工作中，一个外围线索提高观察者的能力，以表明兰道尔特广场目标的哪一边有一个间隙，无论是否使用本地postmask和中央和扩展中性线索。此外，我们记录了分辨率任务中视野不均匀性的存在。假定这些实验仅呈现目标而不添加外部噪声（即，在没有干扰物或掩蔽物的情况下），我们的结果表明瞬时注意增强了刺激表征的质量。此外，由于在兰道尔特平方任务的性能指标的分辨率，这种注意力的好处表明，瞬时注意力可以通过更精细的空间分辨率产生信号增强。
Visual attention can increase spatial resolution even when it leads to a decrease in performance. Whether this effect is mediated by reduction of external noise or by signal enhancement is an unsettled question. Although we previously demonstrated that attention can improve speed and accuracy in an acuity task, those experiments made use of a local postmask, which could be considered a source of external noise. In this work, a peripheral cue improved observers' abilities to indicate which side of a Landolt-square target had a gap whether or not a local postmask was used and with both central- and spread-neutral cues. In addition, we documented the presence of visual field inhomogeneities in a resolution task. Given that these experiments presented the target alone with no external noise added (i.e., without distracters or masks), our results indicate that transient attention enhanced the quality of the stimulus representation. Furthermore, because performance in the Landolt-square task indexes resolution, this attentional benefit indicates that transient attention can produce signal enhancement through finer spatial resolution.