Relative frequency and visual resolution of X- and Y-cells in the LGN of normal and monocularly deprived cats: Interlaminar differences
Relative frequency and visual resolution of X- and Y-cells in the LGN of normal and monocularly deprived cats: Interlaminar differences
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正常猫和单眼剥夺猫 LGN 中 X 细胞和 Y 细胞的相对频率和视觉分辨率：层间差异
DOI：
10.1007/bf00239151
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发表时间：
1979
影响因子：
2
通讯作者：
Dr. K.
中科院分区：
文献类型：
--
作者：
R. Sireteanu;Dr. K.
概述视力本文测定了正常猫和单眼剥夺猫在与中央区成10 °视角内感受野的外侧膝状体背核（LGN）A层和A1层X细胞和Y细胞的相对出现率，使用具有几何变化的空间频率的方波光栅在正常猫的LGN中，A1中Y细胞的出现率（48%）比A（29%）高1.6倍。所有细胞的平均空间分辨率在A（2.5 ± 1.2 c/deg）中比在A1（1.8 ± 1.0 c/deg）中高1.3倍。两个椎板中Y细胞的平均敏锐度相等（1.1 ± 0.5 c/deg），但X细胞在A层中较高（A层2.9 ± 1.0 c/deg，A1层2.5 ± 0.7 c/deg）。在早期单眼剥夺后，剥夺的A1层视力降低（X细胞：A1中1.7 ± 0.9 c/deg vs. A中2.6 ± 0.7 c/deg; Y细胞：A1中0.9 ± 0.4 c/deg vs. A中1.3 ± 0.4 c/deg）。这证实了Maffei和Fiorentini（1976）的结果。然而，X细胞的视敏度在剥夺的A层（3.1 ± 1.0 c/deg）中仍然高于非剥夺的A1层（2.7 ± 0.7 c/deg）。对于Y细胞，两层的视力相等（1.3 ± 0.5 c/deg）。因此，视力的丧失仅在椎板A1中是显著的。在同侧的早期剥夺眼中，所有记录到的Y细胞中只有37%位于剥夺的A1层（这比正常的A1层少1.7倍）。在剥夺眼的同侧，29%的Y细胞记录在剥夺眼的A层（比正常A层少1.3倍）。总之，无论是平均视力的损害和Y细胞的记录概率的减少在A1层（接受剥夺眼的非交叉输入）比在A层（交叉输入）更明显。
SummaryThe visual acuity (spatial resolving power) and the relative incidence of X- and Y-cells in laminae A and A1 of the dorsal lateral geniculate nucleus (LGN) with receptive fields within 10 ° visual angle to the area centralis have been determined in normal and monocularly deprived cats, using a square-wave grating with logarithmically varying spatial frequencies (0.05–8 c/deg).In the normal cat's LGN the incidence of Y-cells is 1.6 times higher in A1 (48% of the relay-cells) than in A (29%). The mean spatial resolution of all cells is 1.3 times higher in A (2.5 ± 1.2 c/deg) than in A1 (1.8 ± 1.0 c/deg). Mean acuity of Y-cells is equal in both laminae (1.1 ± 0.5 c/deg), but for X-cells it is higher in lamina A (2.9 ± 1.0 c/deg in A, vs. 2.5 ± 0.7 c/deg in A1).After early monocular deprivation, visual acuity is reduced in the deprived lamina A1 (X-cells: 1.7 ± 0.9 c/deg in A1 vs. 2.6 ± 0.7 c/deg in A; Y-cells: 0.9 ± 0.4 c/deg in A1 vs. 1.3 ± 0.4 c/deg in A). This confirms the results of Maffei and Fiorentini (1976). However, visual acuity of X-cells is still higher in the deprived lamina A (3.1 ± 1.0 c/deg) than in the non-deprived lamina A1 (2.7 ± 0.7 c/deg). For Y-cells, visual acuity is equal in both laminae (1.3 ± 0.5 c/deg). Thus the loss of visual acuity is only significant in lamina A1. This loss was equally strong in the area centralis and up to 10 ° eccentricity.Ipsilateral to the early deprived eye only 37% of all recorded Y-cells were located in the deprived lamina A1 (this is 1.7 times less than in the normal A1). Contralateral to the deprived eye 29% of the Y-cells were recorded in the deprived lamina A (1.3 times less than in the normal A).In conclusion, both the impairment of mean visual acuity and the reduction in the recording probability of Y-cells were more pronounced in lamina A1 (receiving uncrossed inputs from the deprived eye) than in lamina A (crossed inputs).