Sillito Adam M, Cudeiro Javier, Jones Helen E
Division of Visual Science, Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK.
Trends Neurosci. 2006 Jun;29(6):307-16. doi: 10.1016/j.tins.2006.05.001. Epub 2006 May 19.
Feedback projections are an integral part of the mammalian visual system. Although it is tempting to relegate them to a subsidiary role in visual processing, because their supposed latency and lag might appear to be unfavourable for an involvement in fast processing, this is a dangerous simplification. Certainly for the world in motion, feedback from higher motion areas can influence the transfer of ascending input when, or even before, the input arrives. Here, we consider the circuit formed by layer 6 feedback cells in the visual cortex and how this straddles the retinothalamic and thalamocortical transfer of visual input. We discuss its links to feedback from the cortical motion area MT (V5), and suggest that motion perception involves a dynamic interplay between MT, V1 and the thalamus. This review is part of the TINS special issue on The Neural Substrates of Cognition.
反馈投射是哺乳动物视觉系统不可或缺的一部分。尽管人们很容易将它们在视觉处理中归为次要角色，因为它们所谓的潜伏期和延迟似乎不利于参与快速处理，但这是一种危险的简化观点。当然，对于运动的世界而言，当更高层次运动区域的反馈在输入到达时甚至之前，就可以影响上行输入的传递。在这里，我们考虑由视觉皮层第6层反馈细胞形成的回路，以及它如何跨越视觉输入的视网膜丘脑和丘脑皮层传递。我们讨论了它与皮层运动区域MT（V5）反馈的联系，并表明运动感知涉及MT、V1和丘脑之间的动态相互作用。本综述是《认知神经基础》这一《神经科学趋势》特刊的一部分。
