Cortical Substrates Supporting Visual Search in Humans
Cortical Substrates Supporting Visual Search in Humans
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DOI：
10.1093/cercor/1.3.262
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发表时间：
1991-05-01
期刊：
影响因子：
3.7
通讯作者：
Knight, Robert T.
中科院分区：
文献类型：
--
作者：
Eglin, Mirjam;Robertson, Lynn C.;Knight, Robert T.
对额叶背外侧、顶叶外侧或顶叶皮质局灶性病变的患者进行了连续和并行的视觉搜索任务。在单侧显示条件下，所有患者组的搜索效率与正常对照组相似，无论是在ipsi上还是在显示器的对侧都是如此。相反，在双侧显示条件下，与正常对照组相比，所有患者组在病变对侧启动搜索方面都有明显的延迟。当同侧的注意力需求增加时，这种延迟更加明显，这要么是通过增加目标-分心物辨别的难度(连续搜索任务)，要么是通过增加同侧分心物项目的数量。对侧缺陷在所有患者组中都很明显，这支持了这样的观点，即背外侧额叶以及后顶叶和顶叶皮质在视觉空间注意中起着关键作用。
Serial and parallel visual search tasks were presented to patients with focal lesions in dorsolateral frontal, lateral parietal, or temporal-parietal cortex. In the unilateral display conditions, search efficiency in all patient groups was similar to the normal control group for stimuli both on the ipsi- and on the contralesional side of the displays. In contrast, in the bilateral display conditions, all patient groups showed a marked delay in initiating search on the side contralateral to the lesion as compared to normal controls. This delay was more pronounced when attention demands on the ipsilateral side increased, either by making target-distractor discrimination more difficult (serial search task), or by increasing the number of ipsilateral distractor items. The contralateral deficit was evident in all patient groups, supporting the notion that dorsolateral frontal as well as posterior parietal and temporal-parietal cortex plays a critical role in visual spatial attention.