Tolhurst D J, Ling L
Physiological Laboratory, Cambridge, England.
Hum Neurobiol. 1988;6(4):247-54.
We review the evidence relating to the organization of the human striate cortex to determine whether the latter is organized in a way similar to that of the macaque monkey. There are only limited data available to allow direct determination of the magnification factors in human striate cortex. These suggest that the linear magnification factor is about 1.6 times greater than that in the macaque. This is consistent with the observations that the human striate cortex, compared to that of the macaque, has over 2 times the area, has neurones with longer dendrites, wider ocular dominance columns and more widely separated cytochrome oxidase "blobs". The striate cortices in both species have the same total number of neurones. The foveal magnification factor in the macaque is presently believed to be about 15 mm.deg-1; it seems reasonable, therefore, to believe that the human foveal value will be about 20-25 mm.deg-1 rather than the value of 8-11 mm.deg-1 which is currently accepted. Magnification factor falls more rapidly with eccentricity than do current estimates.
我们回顾了与人类纹状皮质组织结构相关的证据，以确定其组织方式是否与猕猴相似。目前仅有有限的数据可用于直接测定人类纹状皮质的放大因子。这些数据表明，线性放大因子约比猕猴的大1.6倍。这与以下观察结果一致：与猕猴相比，人类纹状皮质的面积超过其两倍，神经元的树突更长，眼优势柱更宽，细胞色素氧化酶“斑”的间距更大。两个物种的纹状皮质神经元总数相同。目前认为猕猴的中央凹放大因子约为15 mm.deg-1；因此，有理由相信人类中央凹的值约为20 - 25 mm.deg-1，而非目前所接受的8 - 11 mm.deg-1。放大因子随离心率下降的速度比目前的估计更快。
