Casagrande V A
Dept of Cell Biology, Vanderbilt University, Nashville, TN 37232-2175.
Trends Neurosci. 1994 Jul;17(7):305-10. doi: 10.1016/0166-2236(94)90065-5.
Recent studies of the primate visual system have focused on the proposal that the perception of form and motion are processed by two parallel pathways that originate from separate populations of cells in the retina. Earlier proposals for parallel processing of visual signals identified a third pathway that could be traced from the retina to the visual cortex. This third pathway was assumed to be unimportant. A growing body of evidence suggests that this pathway to cortex is distinct anatomically, physiologically and neurochemically, and is well represented in primates. These findings raise new and interesting questions not only about the role of this pathway, but also about the intracortical integration of afferent parallel signals.
最近对灵长类动物视觉系统的研究集中在这样一种观点上，即形状和运动的感知是由两条平行的通路处理的，这两条通路起源于视网膜中不同的细胞群。早期关于视觉信号并行处理的观点还确定了第三条通路，这条通路可以从视网膜追溯到视觉皮层。人们认为这条第三条通路并不重要。越来越多的证据表明，这条通向皮层的通路在解剖学、生理学和神经化学方面都很独特，并且在灵长类动物中表现得很明显。这些发现不仅引发了关于这条通路作用的新的有趣问题，也引发了关于传入并行信号在皮层内整合的问题。
