Behavioral performance follows the time course of neural facilitation and suppression during cued shifts of feature-selective attention
Behavioral performance follows the time course of neural facilitation and suppression during cued shifts of feature-selective attention
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DOI：
10.1073/pnas.1002436107
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发表时间：
2010-08-03
影响因子：
11.1
通讯作者：
Mueller, M. M.
中科院分区：
文献类型：
--
作者：
Andersen, S. K.;Mueller, M. M.
注意领域的一个中心问题是视觉处理是否是一种严格有限的资源，必须通过选择性注意来分配。如果是这种情况，对一种刺激的注意力增强必然会导致对无人注意的干扰刺激的抑制。在这里，我们检查特征选择性注意力对两个叠加的红色或蓝色随机点运动图（RDK）之一的自愿提示转移，以测试是否可以观察到增强关注刺激和抑制无人关注刺激之间的这种相互关系。稳态视觉诱发电位（SSVEP）是由闪烁的 RDK 引起的振荡脑反应，通过人类脑电图进行测量。在支持有限资源的情况下，我们观察到有人值守的 RDK 的增强和无人值守的 RDK 的抑制，但这种观察到的互惠性并不是同时发生的：有人值守的 RDK 的增强在提示出现后 220 毫秒开始，先于无人值守的 RDK 的抑制约 130 毫秒。此外，我们发现行为与选择性测量（有人值守减去无人值守）的 SSVEP 时间进程显着相关，但与总活动测量（有人值守加无人值守）显着相关。增强和抑制之间的时间同步互易性的显着偏差表明，在本实验中，有人参与的刺激的增强可能会导致无人参与的刺激的抑制。
A central question in the field of attention is whether visual processing is a strictly limited resource, which must be allocated by selective attention. If this were the case, attentional enhancement of one stimulus should invariably lead to suppression of unattended distracter stimuli. Here we examine voluntary cued shifts of feature-selective attention to either one of two superimposed red or blue random dot kinematograms (RDKs) to test whether such a reciprocal relationship between enhancement of an attended and suppression of an unattended stimulus can be observed. The steady-state visual evoked potential (SSVEP), an oscillatory brain response elicited by the flickering RDKs, was measured inhuman EEG. Supporting limited resources, we observed both an enhancement of the attended and a suppression of the unattended RDK, but this observed reciprocity did not occur concurrently: enhancement of the attended RDK started at 220 ms after cue onset and preceded suppression of the unattended RDK by about 130 ms. Furthermore, we found that behavior was significantly correlated with the SSVEP time course of a measure of selectivity (attended minus unattended) but not with a measure of total activity (attended plus unattended). The significant deviations from a temporally synchronized reciprocity between enhancement and suppression suggest that the enhancement of the attended stimulus may cause the suppression of the unattended stimulus in the present experiment.