The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA.
Nat Rev Neurosci. 2013 May;14(5):350-63. doi: 10.1038/nrn3476. Epub 2013 Apr 18.
Re-entrant or feedback pathways between cortical areas carry rich and varied information about behavioural context, including attention, expectation, perceptual tasks, working memory and motor commands. Neurons receiving such inputs effectively function as adaptive processors that are able to assume different functional states according to the task being executed. Recent data suggest that the selection of particular inputs, representing different components of an association field, enable neurons to take on different functional roles. In this Review, we discuss the various top-down influences exerted on the visual cortical pathways and highlight the dynamic nature of the receptive field, which allows neurons to carry information that is relevant to the current perceptual demands.
皮质区域之间的折返或反馈通路携带丰富多样的关于行为背景的信息，包括注意力、期望、感知任务、工作记忆和运动指令。接收这些输入的神经元有效地充当自适应处理器，能够根据执行的任务采用不同的功能状态。最近的数据表明，特定输入的选择，代表关联场的不同组成部分，使神经元能够承担不同的功能角色。在这篇综述中，我们讨论了施加在视觉皮质通路上的各种自上而下的影响，并强调了感受野的动态性质，这使得神经元能够携带与当前感知需求相关的信息。
