Wachtler T, Wehrhahn C, Lee B B
Max-Planck-Institut für biologische Kybernetik, Tubingen, Germany.
J Comput Neurosci. 1996 Mar;3(1):73-82. doi: 10.1007/BF00158338.
We developed a physiologically plausible model of the first steps of spatial visual information processing in the fovea of the human retina. With the predictions of this model we could support the hypothesis that, for moderate contracts (< or = 40%), hyperacuity is mediated by the magnocellular (MC-) pathway. Despite the lower sampling density in the MC pathway, as compared to the parvocellular (PC-) pathway, the information that is transferred by the MC ganglion cells is sufficient to achieve thresholds comparable to those of human subjects in psychophysical tasks. This is a result of the much higher signal-to-noise ratio of the MC pathway cell signals. The PC pathway cells do not transfer enough information for hyperacuity thresholds.
我们构建了一个关于人类视网膜中央凹空间视觉信息处理最初步骤的生理上合理的模型。基于该模型的预测，我们能够支持这样一种假说，即对于适度对比度（≤40%），超敏锐度是由大细胞（MC-）通路介导的。尽管与小细胞（PC-）通路相比，MC通路中的采样密度较低，但MC神经节细胞传递的信息足以在心理物理学任务中达到与人类受试者相当的阈值。这是MC通路细胞信号的信噪比高得多的结果。PC通路细胞传递的信息不足以达到超敏锐度阈值。
