Schrater P R, Knill D C, Simoncelli E P
Department of Psychology, University of Minnesota, N218 Elliott Hall, 75 E. River Dr., Minneapolis, Minnesota 55455, USA.
Nat Neurosci. 2000 Jan;3(1):64-8. doi: 10.1038/71134.
Visual motion is processed by neurons in primary visual cortex that are sensitive to spatial orientation and speed. Many models of local velocity computation are based on a second stage that pools the outputs of first-stage neurons selective for different orientations, but the nature of this pooling remains controversial. In a human psychophysical detection experiment, we found near-perfect summation of image energy when it was distributed uniformly across all orientations, but poor summation when it was concentrated in specific orientation bands. The data are consistent with a model that integrates uniformly over all orientations, even when this strategy is sub-optimal.
视觉运动由初级视觉皮层中对空间方向和速度敏感的神经元进行处理。许多局部速度计算模型基于第二阶段，该阶段汇总对不同方向具有选择性的第一阶段神经元的输出，但这种汇总的性质仍存在争议。在一项人类心理物理学检测实验中，我们发现当图像能量均匀分布在所有方向上时，其总和近乎完美，但当它集中在特定方向带时，总和效果较差。这些数据与一个在所有方向上进行均匀积分的模型一致，即使这种策略并非最优。
