Simoncelli E P, Heeger D J
Center for Neural Science, New York, NY 10003, USA.
Vision Res. 1998 Mar;38(5):743-61. doi: 10.1016/s0042-6989(97)00183-1.
Electrophysiological studies indicate that neurons in the middle temporal (MT) area of the primate brain are selective for the velocity of visual stimuli. This paper describes a computational model of MT physiology, in which local image velocities are represented via the distribution of MT neuronal responses. The computation is performed in two stages, corresponding to neurons in cortical areas V1 and MT. Each stage computes a weighted linear sum of inputs, followed by rectification and divisive normalization. V1 receptive field weights are designed for orientation and direction selectivity. MT receptive field weights are designed for velocity (both speed and direction) selectivity. The paper includes computational simulations accounting for a wide range of physiological data, and describes experiments that could be used to further test and refine the model.
电生理研究表明，灵长类动物大脑颞中区（MT）的神经元对视觉刺激的速度具有选择性。本文描述了一种MT生理学的计算模型，其中局部图像速度通过MT神经元反应的分布来表示。计算分两个阶段进行，分别对应于皮层区域V1和MT中的神经元。每个阶段都计算输入的加权线性和，然后进行整流和除法归一化。V1感受野权重设计用于方向和方向选择性。MT感受野权重设计用于速度（速度和方向）选择性。本文包括考虑广泛生理数据的计算模拟，并描述了可用于进一步测试和完善该模型的实验。
