FUNCTIONAL BRAIN IMAGING STUDIES OF HUMAN VISUAL COGNITION

调节视觉感知、注意力和记忆的人类神经系统 在完整的大脑中进行了功能性脑成像研究。 正电子发射断层扫描（PET）和功能磁共振 功能磁共振成像（fMRI）用于精确测量局部血流动力学 与所选视觉感知和 记忆任务 这些血流动力学变化是局部变化的指标 神经活动。 人类的纹外视皮层就像 猕猴，被发现组织成腹侧物体视觉 流和背侧空间视觉流。 视觉工作记忆是 发现与前额叶皮层的神经系统有关， 不同的前额叶区域与不同方面的 视觉工作记忆 对面孔的新的长期记忆的编码 与右侧海马活动相关，而这些 记忆不是。 非重叠的新皮层网络与 存储和检索也被证明，表明记忆 存储和检索涉及解剖学上可分离操作。

Human neural systems that mediate visual perception, attention and memory went investigated in the intact brain with functional brain imaging. Positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) were used to measure precisely localized hemodynamic changes associated with the performance of selected visual perceptual and mnemonic tasks. These hemodynamic changes are indices of local changes in neural activity. Human extrastriate visual cortex like that of the macaque monkey, was found to be organized into a ventral object vision stream and a dorsal spatial vision stream. Visual working memory was found to be associated with neural systems in prefrontal cortex, and different prefrontal areas were associated with different aspects of visual working memory. The encoding of new long-term memories for faces was associated with right hippocampal activity whereas retrieval of these memories was not. Non-overlapping neocortical networks associated with storage and retrieval were also demonstrated indicating that memory storage and retrieval involve anatomically dissociable operations.