POSTERIOR ATTENTION SYSTEM IN PERCEPTION AND ACTION

该项目将检验存在两种不同注意力的假设 由后联合皮质调节的过程：一个连接的过程 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，这些研究还将调查 这两个进程是否独立，如果是，则标识 每一个都有神经底物。大部分研究将涉及 测试病变患者注意力能力的实验 后部联合皮质。一系列实验将 对临床消退患者进行调查以确定其程度 在中的无人参与字段中处理哪些简单的视觉要素 与自身领域进行比较。据预测，处理的 对比场中的简单特征将与 自身领域的特征，以及灭绝的赤字 将主要反映未能将感知转化为行动 系统。第二个系列的研究将测试没有临床症状的患者 在检查虚幻连词的任务中的消亡，这是 来自不同对象的信息被错误地组合。它是 预测这些患者将在功能整合方面表现出缺陷 在对抗性领域。

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.