Rhodes Dell L, Robertson Lynn C
Reed College, 3203 S.E. Woodstock Boulevard, Portland, OR 97202, USA.
Brain Cogn. 2002 Oct;50(1):95-115. doi: 10.1016/s0278-2626(02)00014-3.
Single items such as objects, letters or words are often presented in the right or left visual field to examine hemispheric differences in cognitive processing. However, in everyday life, such items appear within a visual context or scene that affects how they are represented and selected for attention. Here we examine processing asymmetries for a visual target within a frame of other elements (scene). We are especially interested in whether the allocation of visual attention affects the asymmetries, and in whether attention-related asymmetries occur in scenes oriented out of alignment with the viewer. In Experiment 1, visual field asymmetries were affected by the validity of a spatial precue in an upright frame. In Experiment 2, the same pattern of asymmetries occurred within frames rotated 90 degrees on the screen. In Experiment 3, additional sources of the spatial asymmetries were explored. We conclude that several left/right processing asymmetries, including some associated with the deployment of spatial attention, can be organized within scenes, in the absence of differential direct access to the two hemispheres.
诸如物体、字母或单词等单个项目通常会呈现在右视野或左视野中，以研究认知加工过程中的半球差异。然而，在日常生活中，此类项目会出现在影响其呈现方式和被选择用于注意的视觉背景或场景中。在此，我们研究在由其他元素构成的框架（场景）内视觉目标的加工不对称性。我们特别感兴趣的是视觉注意的分配是否会影响这种不对称性，以及在与观察者方向不一致的场景中是否会出现与注意相关的不对称性。在实验1中，视野不对称性受到直立框架中空间预提示有效性的影响。在实验2中，屏幕上旋转90度的框架内出现了相同的不对称模式。在实验3中，我们探索了空间不对称性的其他来源。我们得出结论，在不存在对两个半球的差异直接访问的情况下，包括一些与空间注意部署相关的几种左右加工不对称性可以在场景中组织起来。
