REPRESENTATION OF VISUAL-FIELD IN LATERAL GENICULATE-NUCLEUS OF MACACA-MULATTA
REPRESENTATION OF VISUAL-FIELD IN LATERAL GENICULATE-NUCLEUS OF MACACA-MULATTA
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DOI：
10.1002/cne.901610407
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发表时间：
1975-01-01
影响因子：
2.5
通讯作者：
BAKER, FH
中科院分区：
文献类型：
--
作者：
MALPELI, JG;BAKER, FH
应用微电极记录技术研究了猕猴视野向外侧膝状体（LGN）的投射。这些数据被用来构建图表，绘制视觉方向，指定的方位角和仰角，在冠状面，矢状面和水平霍斯利-克拉克平面切割的核的部分。水平子午线的投影将LGN沿着其对称平面分为具有负高程的内侧上级半部和具有正高程的外侧下部半部。高程随着与该平面的距离而变得更正或更负。最接近垂直子午线的方位角位于后方，而最外围的方位角位于前极。两个家庭的表面代表恒定的方位角和仰角的视觉方向进行了说明。沿LGN的后-前轴连续沿着表示偏心率增加的视野区，中央凹区域限于后极，单眼新月形突出到前极。映射在水平子午线上是完全连续的。LGN周围暴露的堆叠细胞板层的边缘形成椭圆形带，其接收对侧半野周边的投影。垂直子午线由该带的后三分之二表示，而半视野的外围投影到前三分之一。中央视野到视盘由六层细胞表示，而双眼视野的其余部分仅投影到四层（2个小细胞和2个大细胞）。单眼新月体由一个小细胞层和一个大细胞层代表。与视盘的投影柱相关的特征被集成到从六层到四层的过渡中。在视盘不连续性附近的感受野地形的细节表明，这些差距是由intralaminar mechanisms.的放大因子（mm 3/球面度）单调增加，从周边视野的中心凹中心，在三十年的范围内变化。该范围介于从视网膜和纹状皮质的文献中报告的数据得出的范围之间。在任何两个角偏心率下的LGN放大率的比率是视网膜神经节细胞密度的相应比率的幂函数，其指数为1.34。同样，在任何两个偏心率的皮质放大率（平方毫米/球面度）的比率是一个功率函数，与指数为1.35，相应的比率LGN放大。
Microelectrode recording techniques were used to investigate the projection of the visual field into the lateral geniculate nucleus (LGN) ofMacaca mulatta. The data were used to construct charts plotting visual direction, designated in terms of azimuth and elevation, onto sections of the nucleus cut in coronal, sagittal and horizontal Horsley‐Clarke planes. The projection of the horizontal meridian divides the LGN along its plane of symmetry into a medial‐superior half having negative elevations and a lateral‐inferior half having positive elevations. Elevations become more positive or negative with distance from this plane. Azimuths closest to the vertical meridian are located posteriorly, while the most peripheral azimuths are found at the anterior pole. Two families of surfaces representing visual directions of constant azimuth and elevation are described. Visual field zones of increasing eccentricity are represented serially along the posterior‐anterior axis of the LGN, with the foveal area restricted to the posterior pole and the monocular crescent projecting to the anterior pole. The mapping is completely continuous across the horizontal meridian. The edges of the stacked cell laminae exposed around the periphery of the LGN form an oval band which receives the projection of the perimeter of the contralateral hemifield. The vertical meridian is represented by the posterior two‐thirds of this band, while the periphery of the hemifield projects to the anterior third.The central visual field out to the optic disc is represented by six cell layers, while the rest of the binocular field projects to four layers only (2 parvocellular and 2 magnocellular). The monocular crescent is represented by one parvocellular and one magnocellular layer. Features associated with the projection column of the optic disc are integrated into the transition from six to four layers. Details of the receptive field topography in the vicinity of the optic disc discontinuities indicate that these gaps are produced by intralaminar mechanisms.The magnification factor (mm3/steradian) increases monotonically from peripheral visual fields to the foveal center, varying over a range of three decades. This range is intermediate between those derived from data reported in the literature for the retina and the striate cortex. The ratio of LGN magnifications at any two angular eccentricities is a power function, with an exponent of 1.34, of the corresponding ratio of retinal ganglion cell densities. Similarly, the ratio of cortical magnifications (mm2/steradian) at any two eccentricites is a power function, with an exponent of 1.35, of the corresponding ratio of LGN magnifications.