Functional Imaging of Decision Networks

描述（由申请人提供）：根据抽象类别做出决策的能力是高阶认知的基本组成部分，对生存至关重要。在过去的十年里，通过视觉心理物理学和单个神经生理学的结合，在清醒的猴子中，对分类决策的理解取得了很大进展。这项工作使我们对顶叶、额叶和下颞叶皮层的决策网络有了更清晰的理解。然而，两个非常基本的问题仍未解决。首先，当猴子从事决策任务时，单单位研究所针对的特定大脑区域的活动与大脑激活的总体模式有何关系？还有哪些区域参与处理此类决定，这些区域发挥什么作用？第二，非人类灵长类动物的结果是否适用于人类？具体来说，在相同的心理物理任务下，我们能否在人类和非人类灵长类动物的大脑之间建立功能同源性？为了回答这些问题，我们建议使用功能性磁共振成像在清醒的行为猴子映射大脑区域的感知分类任务期间被激活，使用与人类受试者相同的范式。拟议中的实验将开辟一条新的途径，研究精神分裂症、注意力缺陷障碍、帕金森病和阿尔茨海默病中严重受损的认知过程。

DESCRIPTION (provided by applicant): The ability to make decisions based on abstract categories is a fundamental component of higher-order cognition and is essential for survival. In the past decade, much progress in understanding categorical decision-making has been made through the combination of visual psychophysics and single-unit neurophysiology in awake, behaving monkeys. This work has led to a clearer understanding of decision networks in parietal, frontal and inferotemporal cortex. However, two very basic questions remain unresolved. First, how does activity in specific brain regions targeted by single unit studies relate to the overall pattern of brain activation when monkeys are engaged in decision-making tasks? What additional regions also are involved in processing such decisions, and what role do such regions play? Second, are results from non-human primates applicable to humans? Specifically, given identical psychophysical tasks, can we establish functional homology between human and non-human primate brains? To answer these questions, we propose to use functional magnetic resonance imaging in awake behaving monkeys to map brain regions that are activated during a perceptual categorization task, using a paradigm identical to one used with human subjects. The proposed experiments will open up a new avenue of research into cognitive processes that are dramatically impaired in schizophrenia, attention-deficit disorder, Parkinson's disease, and Alzheimer's disease.