Institute of Psychology, University of Graz, Austria; BioTechMed-Graz, Austria.
Institute of Psychology, University of Graz, Austria.
Neuropsychologia. 2021 Mar 12;153:107763. doi: 10.1016/j.neuropsychologia.2021.107763. Epub 2021 Jan 22.
In serial visual search we shift attention successively from location to location in search for the target. Although such search has been investigated using fMRI, overt attention (i.e., eye movements) was usually neglected or discouraged. As a result, it is unclear what happens in the instant when our gaze falls upon a target as compared to a distractor. In the present experiment, we used a multiple target search task that required eye movements and employed an analysis based on fixations as events of interest to investigate differences between target and distractor processing. Twenty young healthy adults indicated the number of targets (0-3) among distractors in a 20-item display. Compared to distractor fixations, we found that target fixations gave rise to wide-spread activation in the dorsal attention system, as well as in the visual cortex. Targets that were found later during the search activated the left inferior frontal gyrus and the left supramarginal gyrus more strongly than those that were found earlier. Finally, areas associated with visual and verbal working memory showed increased activation with a larger number of targets in the display.
在连续视觉搜索中，我们的注意力会从一个位置依次转移到另一个位置，以寻找目标。尽管这种搜索已经通过 fMRI 进行了研究，但通常会忽略或不鼓励明显的注意力（即眼球运动）。因此，目前尚不清楚当我们的目光落在目标上与落在分心物上时有何不同。在本实验中，我们使用了一种需要眼球运动的多目标搜索任务，并采用基于注视的分析作为感兴趣的事件来研究目标和分心物处理之间的差异。二十名年轻健康的成年人在 20 项显示中指出了分心物中的目标数量（0-3）。与分心物的注视相比，我们发现目标注视会引起背侧注意系统以及视觉皮层的广泛激活。在搜索过程中发现较晚的目标比发现较早的目标会更强烈地激活左侧额下回和左侧缘上回。最后，与视觉和语言工作记忆相关的区域在显示中有更多目标时会显示出更强的激活。
