Spatial and temporal receptive fields of geniculate and cortical cells and directional selectivity
Spatial and temporal receptive fields of geniculate and cortical cells and directional selectivity
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DOI：
10.1016/s0042-6989(00)00210-8
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发表时间：
2000-01-01
期刊：
影响因子：
1.8
通讯作者：
Wilson, JA
中科院分区：
文献类型：
--
作者：
De Valois, RL;Cottaris, NP;Wilson, JA
对猕猴外侧膝状核 (LGN) 和纹状皮层 (V1) 细胞的时空感受野 (RF) 进行了检查，发现了两个不同的非定向 V1 细胞亚群：具有缓慢的大部分单相时间 RF 的细胞和具有快速非常双相时间反应的细胞。这两个亚群在时间上正交，当慢速单相细胞达到其峰值响应时，快速双相细胞从一个响应阶段过渡到相反阶段。这两个亚群的 RF 空间相位也有所不同。对定向V1细胞时空RF的主成分分析表明，其RF可以由两个成分的线性组合构成，其中一个成分具有快速双相细胞的时空特征，另一个成分具有慢速单相细胞的时空特征。大细胞 LGN 细胞是快速双相细胞，领先于快速双相 V1 亚群 7 毫秒；细小细胞 LGN 细胞速度缓慢且大部分为单相，并且领先于缓慢单相 V1 亚群 12 ms。我们建议定向 V1 细胞通过组合来自已识别的两个非定向皮层亚群的信号来获得运动检测所需的近似时间和空间正交的输入，并且这些亚群分别起源于大和细小 LGN 细胞。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
The spatio-temporal receptive fields (RFs) of cells in the macaque monkey lateral geniculate nucleus (LGN) and striate cortex (V1) have been examined and two distinct sub-populations of non-directional V1 cells have been found: those with a slow largely monophasic temporal RF, and those with a fast very biphasic temporal response. These two sub-populations are in temporal quadrature, the fast biphasic cells crossing over from one response phase to the reverse just as the slow monophasic cells reach their peak response. The two sub-populations also differ in the spatial phases of their RFs. A principal components analysis of the spatio-temporal RFs of directional V1 cells shows that their RFs could be constructed by a linear combination of two components, one of which has the temporal and spatial characteristics of a fast biphasic cell, and the other the temporal and spatial characteristics of a slow monophasic cell. Magnocellular LGN cells are fast and biphasic and lead the fast-biphasic V1 subpopulation by 7 ms; parvocellular LGN cells are slow and largely monophasic and lead the slow monophasic V1 sub-population by 12 ms. We suggest that directional V1 cells get inputs in the approximate temporal and spatial quadrature required for motion detection by combining signals from the two non-directional cortical sub-populations which have been identified, and that these sub-populations have their origins in magno and parvo LGN cells, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.