Brain signals for spatial attention predict performance in a motion discrimination task
Brain signals for spatial attention predict performance in a motion discrimination task
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DOI：
10.1073/pnas.0504678102
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发表时间：
2005-12-06
影响因子：
11.1
通讯作者：
Corbetta, M
中科院分区：
文献类型：
--
作者：
Sapir, A;d'Avossa, G;Corbetta, M
视知觉的可靠性被认为反映了感觉信息的质量。然而，我们表明，受试者的表现可以预测，一次又一次的试验，神经活动之前的感官刺激的发作。利用功能性磁共振成像（fMRI），我们研究了如何调节空间注意的神经机制影响运动辨别判断的准确性。在60-75%的试验中，在引导空间注意力的线索后，血氧水平依赖（BOLD）信号的幅度预测了受试者的准确性。广泛的预测信号，其中包括背顶叶，视觉外纹，前额叶和感觉运动皮层，取决于是否正确的线索指定的刺激位置。因此，这些信号指示了线索信息的利用程度，并在空间注意的控制中发挥作用。我们的结论是，知觉表现的变化可以部分解释的内源性，准备过程的变化和BOLD信号可以用来预测人类的行为。
The reliability of visual perception is thought to reflect the quality of the sensory information. However, we show that subjects' performance can be predicted, trial-by-trial, by neural activity that precedes the onset of a sensory stimulus. Using functional MRI (fMRI), we studied how neural mechanisms that mediate spatial attention affect the accuracy of a motion discrimination judgment. The amplitude of blood oxygen level-dependent (BOLD) signals after a cue directing spatial attention predicted subjects' accuracy on 60-75% of the trials. Widespread predictive signals, which included dorsal parietal, visual extra-striate, prefrontal and sensory-motor cortex, depended on whether the cue correctly specified the stimulus location. Therefore, these signals indicate the degree of utilization of the cued information and play a role in the control of spatial attention. We conclude that variability in perceptual performance can be partly explained by the variability in endogenous, preparatory processes and that BOLD signals can be used to forecast human behavior.