Graded functional activation in the visuospatial system with the amount of task demand
Graded functional activation in the visuospatial system with the amount of task demand
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DOI：
10.1162/089892999563210
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发表时间：
1999-01-01
影响因子：
3.2
通讯作者：
Thulborn, K
中科院分区：
文献类型：
--
作者：
Carpenter, PA;Just, MA;Thulborn, K
两项研究探讨了计算需求的数量和类型如何与Shepard-Metzler（1971）心理旋转范式中涉及的三个双侧皮层区域的fMRI测量的激活相关。视觉空间坐标计算的需求量被操纵的心理旋转问题，增加角度差异（0，40，80，或120度）。在两个独立的研究中，左，右顶内沟区的激活与角度差异呈线性增加。激活也发生在梭状回和颞下区，这些区域主要与物体和物体部分识别过程有关。相比之下，对对象识别和旋转过程的需求相对较低，并且在需要对两个网格进行系统视觉扫描的控制条件下，对执行扫视的需求较高。网格扫描条件导致相对较少的激活顶叶和下颞区，但相当大的激活额区，与规划和执行扫视，包括中央前回和沟到后中额区。这些数据表明，支持视觉空间处理的各个皮层区域的激活量与计算需求的量以及类型有关。
Two studies examined how the amount and type of computational demand are related to fMRI-measured activation in three bilateral cortical regions involved in the Shepard-Metzler (1971) mental-rotation paradigm. The amount of demand for the computation of visuospatial coordinates was manipulated by presenting mental rotation problems with increasing angular disparity (0, 40, 80, or 120 degrees). Activation in both the left and right intraparietal sulcal regions increased linearly with angular disparity in two separate studies. Activation also occurred in the fusiform gyrus and inferior temporal regions, regions that are primarily associated with the processes of object and object-part identification. By contrast, the demand for object recognition and rotation processes was relatively low, and the demand for executing saccades was high in a control condition that required making a systematic visual scan of two grids. The grid-scanning condition resulted in relatively less activation in the parietal and inferior temporal regions but considerable activation in frontal areas that are associated with planning and executing saccades, including the precentral gyrus and sulcus into the posterior middle frontal region. These data suggest that the amount of activation in the various cortical regions that support visuospatial processing is related to the amount, as well as to the type, of computational demand.