Attentive and pre-attentive aspects of figural processing
Attentive and pre-attentive aspects of figural processing
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DOI：
10.1167/9.11.18
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发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Norcia, Anthony M.
中科院分区：
文献类型：
--
作者：
Appelbaum, Lawrence G.;Norcia, Anthony M.
在这里，我们使用稳态视觉诱发电位(SSVEP)来研究对简单纹理定义形状的注意力和非注意力的加工。通过对具有不同时间频率的图形和背景区域进行标记，该方法隔离与图形区域、背景区域以及区域之间的非线性时空相互作用相关联的响应分量。这些反应类别中的每一个都有不同的头皮地形图，在不同的注意任务要求下被保存下来。在一项任务中，注意力被引导到图形区域的形状变化的辨别上。在另一项任务中，使用困难的字母辨别来转移注意加工资源，使其从纹理定义的形式上转移。图形反应和图形/背景交互作用的任务依赖性效应大于背景反应。在形状与字母任务条件下，图形区域反应在枕区延迟，而区域交互作用增强，特别是在额区。虽然图形和背景加工的基本区别独立于任务，但对基本形状的注意加工招募了后来的枕叶活动用于图形加工，并在额区持续的非线性图形/背景交互作用。总而言之，这些结果表明，场景分割的基本方面是在注意之前进行的，但对物体形状的定向注意涉及到包括额区和枕区在内的广泛分布的大脑区域网络。
Here we use the steady-state visual evoked potential (SSVEP) to study attentive versus non-attentive processing of simple texture-defined shapes. By "tagging" the figure and background regions with different temporal frequencies, the method isolates response components associated with the figure region, the background region, and with non-linear spatiotemporal interactions between regions. Each of these response classes has a distinct scalp topography that is preserved under differing attentional task demands. In one task, attention was directed to discrimination of shape changes in the figure region. In the other task, a difficult letter discrimination was used to divert attentive processing resources away from the texture-defined form. Larger task-dependent effects were observed for figure responses and for the figure/background interaction than for the background responses. The figure region responses were delayed in occipital areas in the shape versus letter task conditions, while the region interactions were enhanced, especially in frontal areas. While a basic differentiation of figure from background processing occurred independent of task, attentive processing of elementary shapes recruited later occipital activity for figure processing and sustained non-linear figure/background interaction in frontal areas. Collectively, these results indicate that basic aspects of scene segmentation proceed pre-attentively, but that directed attention to the object shape engages a widely distributed network of brain areas including frontal and occipital regions.