视觉搜索中的固定目标:背侧和腹侧注意力网络在相关性和稀有性处理中的作用

Anja Ischebeck, Hannah Kreilinger, Joe Peiris Miller, Margit Höfler, Iain D. Gilchrist, C. Körner
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摘要

摘要 在连续视觉搜索任务中,经常观察到背侧注意网络被激活,这与负责处理任务相关性的目标导向注意有关。在连续视觉搜索中,目标检测的瞬间不仅是一个任务相关事件,也是一个罕见事件。在本 fMRI 实验中,我们采用了一种基于固定的分析方法,将任务相关性与项目稀有性区分开来。我们使用了多目标搜索任务,参与者必须报告显示屏中分散注意力的目标数量。我们还在显示中添加了稀有的干扰项。我们发现,稀有事件(目标和稀有分心物)比普通分心物更强烈地激活了背侧注意网络。更重要的是,我们观察到,分别属于背侧和腹侧注意系统的左侧 IPS 和左侧岛叶对目标的激活比对稀有分心物的激活更强。通过多象素模式分析,我们发现双侧 TPJ(也是与腹侧注意系统相关的区域)的激活区分了目标和稀有分心固定。这些结果表明,TPJ 的作用扩大了,它似乎可以处理与任务相关性有关的后感知信息。
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Fixating targets in visual search: The role of dorsal and ventral attention networks in the processing of relevance and rarity
Abstract The dorsal attention network, often observed to be activated in serial visual search tasks, has been associated with goal-directed attention, responsible for the processing of task relevance. In serial visual search, the moment of target detection constitutes not only a task-relevant event, but also a rare event. In the present fMRI experiment, we disentangled task relevance from item rarity using a fixation-based analysis approach. We used a multiple target search task, and participants had to report the number of targets among distractors in the display. We had also added rare distractors to the displays. We found that rare events (targets and rare distractors) activated the dorsal attention network more strongly than common distractors. More importantly, we observed that the left IPS and the left insula, belonging to the dorsal and ventral attention system, respectively, were more strongly activated for targets compared to rare distractors. Using multi-voxel pattern analysis, we found that activation in the TPJ, bilaterally, an area also associated with the ventral attention system, distinguished between target and rare distractor fixations. These results point to an expanded role of the TPJ that seems to process post-perceptual information which is linked to task relevance.
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