注意力通过增加神经反应的输入基线来增强对比度外观。
Attention enhances contrast appearance via increased input baseline of neural responses.
作者信息
Cutrone Elizabeth K, Heeger David J, Carrasco Marisa
机构信息
Department of Psychology, New York University, New York, NY, USA.
Department of Psychology, New York University, New York, NY, USA Center for Neural Science, New York University, New York, NY, USA.
出版信息
J Vis. 2014 Dec 30;14(14):16. doi: 10.1167/14.14.16.
Abstract
Covert spatial attention increases the perceived contrast of stimuli at attended locations, presumably via enhancement of visual neural responses. However, the relation between perceived contrast and the underlying neural responses has not been characterized. In this study, we systematically varied stimulus contrast, using a two-alternative, forced-choice comparison task to probe the effect of attention on appearance across the contrast range. We modeled performance in the task as a function of underlying neural contrast-response functions. Fitting this model to the observed data revealed that an increased input baseline in the neural responses accounted for the enhancement of apparent contrast with spatial attention.
摘要
隐蔽空间注意会增加被注意位置上刺激的感知对比度，大概是通过增强视觉神经反应来实现的。然而，感知对比度与潜在神经反应之间的关系尚未得到明确描述。在本研究中，我们系统地改变刺激对比度，使用二选一的强制选择比较任务来探究注意在整个对比度范围内对外观的影响。我们将任务中的表现建模为潜在神经对比度反应函数的函数。将该模型与观察到的数据拟合后发现，神经反应中输入基线的增加解释了空间注意下表观对比度的增强。
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