Sundberg Kristy A, Fallah Mazyar, Reynolds John H
Systems Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Neuron. 2006 Feb 2;49(3):447-57. doi: 10.1016/j.neuron.2005.12.023.
When one element in an apparent motion sequence differs in color from the others, it is perceived as shifted along the motion trajectory. We examined whether V4 neurons encode the physical or perceived location of this "flashed" element by recording neuronal responses while monkeys viewed these stimuli. The retinotopic locus of V4 activity evoked by the flashed element shifted along the motion trajectory. The magnitude of the shift is consistent with the perceptual shift in humans viewing identical stimuli. This retinotopic distortion depended on the presence of a flashed element but was observed for both color-selective and non-color-selective neurons. The distortion was undiminished when the flashed element terminated the sequence, a condition that reduced the perceptual shift in humans. These findings are consistent with a Bayesian model of localization in which perceived location is derived from position signals optimally integrated across visual areas.
当视显运动序列中的一个元素在颜色上与其他元素不同时，它会被感知为沿着运动轨迹发生了偏移。我们通过在猴子观看这些刺激时记录神经元反应，来研究V4神经元是编码这个“闪烁”元素的实际位置还是感知位置。由闪烁元素诱发的V4活动的视网膜拓扑位置沿着运动轨迹发生了偏移。这种偏移的幅度与观看相同刺激的人类的感知偏移一致。这种视网膜拓扑畸变依赖于闪烁元素的存在，但在颜色选择性和非颜色选择性神经元中均被观察到。当闪烁元素终止序列时，这种畸变并未减弱，而在人类中这种情况下感知偏移会减少。这些发现与一种定位的贝叶斯模型一致，在该模型中，感知位置是从跨视觉区域最佳整合的位置信号中推导出来的。
