POSTERIOR ATTENTION SYSTEM IN PERCEPTION AND ACTION

该项目将测试假设有两个独立的注意力 后联合皮层介导的过程：一个连接 视觉特征在物体识别过程中的作用， 选择要操作的对象。此外，研究还将调查 这两个过程是否独立，如果是，确定 神经基质大部分研究将涉及 测试病变患者注意力的实验 后联合皮层的一部分一系列的实验将 调查临床消退的患者，以确定 哪些简单的视觉特征在无人值守的现场处理， 与同病灶区相比。据预测， 对侧病灶区的简单特征将与 在同病领域的特点，并在灭绝赤字 将主要反映一个失败的转移到行动的感受 系统第二个系列的研究将测试没有临床症状的患者。 灭绝的任务，检查虚幻的连接，一种现象， 来自不同对象的信息被错误地组合。是 预测这些患者将表现出功能整合的缺陷， 在对侧病灶区

The project will test the hypothesis that there are two separate attention processes mediated by posterior association cortex: One which conjoins visual features in the process of object recognition, an a second which selects objects for action. In addition the studies will investigate whether these two processes are independent and, if so, identify the neural substrate underlying each. Most of the research will involve experiments that test the attentional abilities of patients with lesions of posterior association cortex. One series of experiments will investigate patients with clinical extinction to determine the degree to which simple visual features are processed in the unattended field in comparison to the ipsilesional field. It is predicted that processing of simple features in the contralesional field will be comparable to that for features in the ipsilesional field, and that the deficit in extinction will reflect primarily a failure to transfer the percept to the action system. A second series of studies will test patients without clinical extinction in a task to examine illusory conjunctions, a phenomenon in which information from different objects is erroneously combined. It is predicted that these patients will show a deficit in feature integration in the contralesional field.