The role of left and right intraparietal sulcus in the attentional blink: a transcranial magnetic stimulation study
The role of left and right intraparietal sulcus in the attentional blink: a transcranial magnetic stimulation study
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DOI：
10.1007/s00221-007-0896-1
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发表时间：
2007-02
影响因子：
2
通讯作者：
Ken Kihara;Nobuyuki Hirose;T. Mima;M. Abe;H. Fukuyama;N. Osaka
中科院分区：
文献类型：
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作者：
Ken Kihara;Nobuyuki Hirose;T. Mima;M. Abe;H. Fukuyama;N. Osaka
处理一个视觉目标（T1）使得很难意识到第二个目标（T2），当两个目标嵌入在一个分心刺激流中，在大约500毫秒内出现时。这种现象被称为注意眨眼（attention blink， AB），反映了视觉注意分配的时间限制。尽管一些研究表明顶叶区域与AB现象有关，但其功能相关性尚不清楚。我们使用经颅磁刺激（TMS）研究了左和/或右顶叶内沟（IPS）是否导致了AB瓶颈。单脉冲经颅磁刺激在T1-TMS非同步启动350 ms时诱导左或右IPS活动短暂中断，促进了AB缺陷的恢复过程，而相同时间的经颅磁刺激或假刺激在Cz上没有影响。这些结果提供了直接证据，表明左右IPS的激活参与了AB的发生。这一发现支持了IPS在控制视觉意识的时间动态的皮质网络中起关键作用的观点。
Processing of one visual target (T1) makes it difficult to become aware of a second target (T2), when two targets, embedded in a stream of distractor stimuli, occur within about 500 ms. This phenomenon is known as attentional blink (AB) and reflects the temporal limitation in allocating visual attention. Although several studies suggest that parietal regions are concerned with the AB phenomenon, their functional relevance remains unclear. We investigated whether left and/or right intraparietal sulcus (IPS) contributed to the AB bottleneck using transcranial magnetic stimulation (TMS). The course of recovery from the AB deficit was facilitated when single pulse TMS induced a transient interruption of left or right IPS activity at a T1-TMS stimulus onset asynchrony of 350 ms, while there was no effect of TMS or sham stimulation delivered over Cz with the same timing. These results provide direct evidence that activation of left as well as right IPS is involved in the genesis of AB. This finding supports the idea that the IPS plays a critical role in the cortical network controlling the temporal dynamics of visual awareness.