Spatial attention excludes external noise at the target location
Spatial attention excludes external noise at the target location
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DOI：
10.1167/2.4.4
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发表时间：
2002-01-01
影响因子：
1.8
通讯作者：
Dosher, Barbara A.
中科院分区：
文献类型：
--
作者：
Lu, Zhong-Lin;Lesmes, Luis A.;Dosher, Barbara A.
为了研究外部噪声排除的本质，我们比较了16种条件下的中央空间预取效应，这些条件包括外部噪声的数量、信号刺激的数量、被外部噪声掩盖的位置的数量以及潜在目标位置周围的帧的数量和风格。在没有外部噪声的情况下，预提示在少数显示条件下只产生了轻微的性能改善。在高外部噪声存在的情况下，预示着在所有显示条件下任务性能的改善。这些空间注意效应的大小，通过对比度阈值降低来衡量，在所有显示条件下几乎是恒定的。这表明，空间注意基本上排除了目标位置的外部噪声；当位置不确定性被报告线索消除时，非目标区域的外部噪声和/或信号刺激的存在对空间绩效的影响很小。然而，目标的其他潜在位置的存在是至关重要的，因为如果事先知道目标位置，则可以在有或没有线索的情况下将注意力集中在该位置上。
To investigate the nature of external noise exclusion, we compared central spatial precuing effects in 16 conditions that varied the amount of external noise, the number of signal stimuli, the number of locations masked by external noise, and the number and style of frames surrounding potential target locations. In the absence of external noise, precuing produced only marginal performance improvements in a small number of display conditions. In the presence of high external noise, precuing improved task performance in all the display conditions. The magnitude of these spatial attention effects, as gauged by contrast threshold reduction, is nearly constant across all the display conditions. This suggests that spatial attention mostly excludes external noise at the target location; the presence of external noise and/or signal stimuli in non-target regions has little effect on spatial performance when location uncertainty is eliminated by report cues. However, the presence of other potential locations for the target is critical, because if target location is known in advance, attention can be focused on that location with or without a cue.