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Neural representations of contextual guidance in visual search of real-world scenes

机译:真实场景的视觉搜索中上下文指导的神经表示

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Exploiting scene context and object- object co-occurrence is critical in guiding eye movements and facilitating visual search, yet the mediating neural mechanisms are unknown.Weused functional magnetic resonance imaging while observers searched for target objects in scenes and used multivariate pattern analyses (MVPA) to show that the lateral occipital complex (LOC) can predict the coarse spatial location of observers' expectations about the likely location of 213 different targets absent from the scenes. In addition, we found weaker but significant representations of context location in an area related to the orienting of attention (intraparietal sulcus, IPS) as well as a region related to scene processing (retrosplenial cortex, RSC). Importantly, the degree of agreement among 100 independent raters about the likely location to contain a target object in a scene correlated with LOC's ability to predict the contextual location while weaker but significant effects were found in IPS, RSC, the human motion area, and early visual areas (V1, V3v). When contextual information was made irrelevant to observers' behavioral task, the MVPA analysis of LOC and the other areas' activity ceased to predict the location of context. Thus, our findings suggest that the likely locations of targets in scenes are represented in various visual areas with LOC playing a key role in contextual guidance during visual search of objects in real scenes.
机译:利用场景上下文和对象-对象共存在引导眼睛运动和促进视觉搜索方面至关重要,但是介导的神经机制尚不清楚。在观察者在场景中搜索目标对象并使用多元模式分析(MVPA)时,使用了功能磁共振成像表明侧面枕骨复合体(LOC)可以预测观察者对场景中213个不同目标的可能位置的期望的大致空间位置。此外,我们在与注意力定位相关的区域(腹腔沟,IPS)以及与场景处理相关的区域(脾后皮质,RSC)中发现了较弱但重要的上下文位置表示。重要的是,在场景中包含目标对象的可能位置的100个独立评估者之间的一致程度与LOC预测上下文位置的能力相关,而在IPS,RSC,人体运动区域和早期阶段则发现了较弱但重要的影响可视区域(V1,V3v)。当上下文信息与观察者的行为任务无关时,对LOC和其他区域活动的MVPA分析就不再预测上下文的位置。因此,我们的发现表明,场景中目标的可能位置在各种视觉区域中得以体现,而在实际场景中对对象进行视觉搜索时,LOC在上下文指导中起着关键作用。

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