Neural correlates of object-based attention.
Neural correlates of object-based attention.
复制标题
基于对象的注意力的神经关联。
DOI：
10.1167/2.9.1
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发表时间：
2002
影响因子：
1.8
通讯作者：
A. Norcia
中科院分区：
文献类型：
--
作者：
F. Pei;M. Pettet;A. Norcia
许多研究都是针对解开注意力的“单位”：注意力是指向空间中的位置、视觉对象还是指向对象的个体特征？此外，人们对注意力是否会增加神经机制的增益（信号增强）或通过其他方式起作用（如减少噪音或缩小通道调谐）也有相当大的兴趣。为了解决这些问题，我们使用了一个直接测量信号强度：视觉诱发电位的振幅和一个任务，其中选择可以基于深度顺序线索，但不是位置。注意和nonattended刺激，在不同的时间频率，因此，反应的两个刺激可以分别分析，即使他们同时提出。注意力增加了反应的二次谐波分量的幅度，但不是四次谐波。此外，在第二谐波，但不是在第四谐波测量的反应，被视为后面的刺激更大。结果与在处理阶段产生的四次谐波一致，该处理阶段不能引起注意，并且深度顺序尚未提取。另一方面，二次谐波是可以被注意力改变的，并且显示出深度顺序的差分编码的证据。
Much research has been directed toward disentangling the "units" of attention: Is attention directed to locations in space, visual objects, or to individual features of an object? Moreover, there is considerable interest in whether attention increases the gain of neural mechanisms (signal enhancement) or acts by other means, such as reducing noise or narrowing channel tuning. To address these questions, we used a direct measure of signal strength: the amplitude of visual evoked potentials and a task in which selection could be based on a depth order cue but not on location. Attended and nonattended stimuli were presented at different temporal frequencies, and, thus, responses to the two stimuli could be analyzed separately even though they were presented simultaneously. Attention increased the amplitude of the second harmonic component of the response, but not the fourth harmonic. In addition, responses measured at the second harmonic, but not at the fourth harmonic, were larger for stimuli seen as behind. The results are consistent with the fourth harmonic being generated at a stage of processing that is not accessible to attention and where depth order has not been extracted. The second harmonic, on the other hand, is modifiable by attention and shows evidence for differential encoding of depth order.
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影响因子：
56.9
作者：
CORBETTA, M;MIEZIN, FM;PETERSEN, SE
通讯作者：
PETERSEN, SE
DOI：
10.1073/pnas.93.10.4770
发表时间：
1996-05-14
影响因子：
11.1
作者：
Morgan, ST;Hansen, JC;Hillyard, SA
通讯作者：
Hillyard, SA
DOI：
10.1037/0096-1523.14.2.188
发表时间：
1988-05-01
影响因子：
2.1
作者：
DOWNING, CJ
通讯作者：
DOWNING, CJ
影响因子：
4.1
作者：
VECERA, SP;FARAH, MJ
通讯作者：
FARAH, MJ