Specialization of mid-tier stages of dorsal and ventral pathways in stereoscopic processing
Specialization of mid-tier stages of dorsal and ventral pathways in stereoscopic processing
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DOI：
10.1101/2020.03.10.985721
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
Toshihide W. Yoshioka;T. Doi;Mohammad Abdolrahmani;I. Fujita
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文献类型：
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作者：
Toshihide W. Yoshioka;T. Doi;Mohammad Abdolrahmani;I. Fujita
背侧和腹侧视觉通路之间的分工是大脑皮层中并行信息处理的一个有影响力的模型。然而，在单神经元分辨率的两个途径的直接比较一直是稀缺的。在这里，我们比较了MT和V4，在猴子的两个途径的中层地区，处理双眼视差，深度知觉和视觉引导的行动的一个强大的线索。我们报告了一种新的权衡，其中MT神经元快速而稳健地传输视差信号，而V4神经元显着地用额外的时间来改变信号的性质，以解决立体声对应问题。因此，信令速度和鲁棒性被用来换取计算复杂性。这种权衡的关键因素是视差调谐的形状：V4神经元比MT神经元具有更多的偶对称调谐。此外，调谐形状和信号转换之间的这种相关性存在于MT和V4内的单个神经元中。总的来说，我们的研究结果揭示了在立体加工中背侧和腹侧通路的独特信号优势和共同的调谐曲线特征。
The division of labor between the dorsal and ventral visual pathways is an influential model of parallel information processing in the cerebral cortex. However, direct comparison of the two pathways at the single-neuron resolution has been scarce. Here we compare how MT and V4, mid-tier areas of the two pathways in the monkey, process binocular disparity, a powerful cue for depth perception and visually guided actions. We report a novel tradeoff where MT neurons transmit disparity signals quickly and robustly, whereas V4 neurons markedly transform the nature of the signals with extra time to solve the stereo correspondence problem. Therefore, signaling speed and robustness are traded for computational complexity. The key factor in this tradeoff was the shape of disparity tuning: V4 neurons had more even-symmetric tuning than MT neurons. Moreover, this correlation between tuning shape and signal transformation was present across individual neurons within both MT and V4. Overall, our results reveal both distinct signaling advantages and common tuning-curve features of the dorsal and ventral pathways in stereoscopic processing.