EXPECTANCY AND VISUAL SPATIAL ATTENTION - EFFECTS ON PERCEPTUAL QUALITY
EXPECTANCY AND VISUAL SPATIAL ATTENTION - EFFECTS ON PERCEPTUAL QUALITY
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DOI：
10.1037/0096-1523.14.2.188
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发表时间：
1988-05-01
影响因子：
2.1
通讯作者：
DOWNING, CJ
中科院分区：
文献类型：
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作者：
DOWNING, CJ
当我们期望在特定空间位置出现重要刺激时，我们的感知敏感性如何随空间变化？受试者被提示在一个位置期待目标刺激，然后要求在该位置和其他三个位置执行以下任务之一：亮度检测、亮度辨别、方向辨别或形状辨别。根据信号检测理论对受试者表现进行的分析揭示了每项任务的敏感性和偏差的变化。在预期目标刺激的位置处，灵敏度得到最大程度的增强，并且通常随着距该位置的距离而降低。影响敏感性梯度的因素是（a）执行的任务类型和（b）刺激的空间分布。方向和形状辨别的灵敏度随距离的变化比亮度检测和亮度辨别的灵敏度下降得更剧烈。此外，当刺激彼此靠近时，其下降幅度比刺激距离较远时下降得更剧烈。
When we expect important stimuli at a particular spatial location, how does our perceptual sensitivity change over space? Subjects were cued to expect a target stimulus at one location and then required to perform one of the following tasks at that and three other locations: luminance detection, brightness discrimination, orientation discrimination, or form discrimination. The analysis of subjects’ performance according to signal detection theory revealed changes in both sensitivity and bias for each of these tasks. Sensitivity was maximally enhanced at the location where a target stimulus was expected and generally decreased with distance from that location. Factors that influenced the gradient of sensitivity were (a) the type of task performed and (b) the spatial distribution of the stimuli. Sensitivity fell off more steeply over distance for orientation and form discrimination than for luminance detection and brightness discrimination. In addition, it fell off more steeply when stimuli were near each other than when they were farther apart.