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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Single-neuron responses and neuronal decisions in a vernier task
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Single-neuron responses and neuronal decisions in a vernier task

机译：游标任务中的单神经元反应和神经元决策

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摘要

Vernier acuity is a measure of the smallest horizontal offset between two vertical lines that can be behaviorally discriminated. To examine the link between the neuronal responses in a retino-topic mosaic and vernier acuity, we recorded the responses of single cells in cat lateral geniculate nucleus to a vertical bar stimulus that was stepped in small increments through the receptive fields of cells. Based on the single-trial responses evoked by stimuli at different positions, we calculated the spatial resolution that could be achieved. If the stimulus could fall anywhere in their receptive fields, single neurons had spatial resolutions two times worse than previously reported vernier thresholds. Given the known coverage factor in a cat retina, we developed a two-stage decision model to examine how the responses of neurons in a retinotopic mosaic could be processed to achieve vernier acuity. In order for psychophysical thresholds to be accounted for by the responses of a single cell, the stimulus must fall in the quarter of the receptive field that provides the most information about stimulus position. Alternatively, both the absolute psychophysical threshold for vernier acuity and its dependence on stimulus length can be realized by pooling the responses of a few neurons, all located on one side of the bar stimulus.
机译：游标敏锐度是在行为上可以区分的两条垂直线之间最小水平偏移的量度。为了检查视网膜局部镶嵌中的神经元反应与游标敏锐度之间的联系，我们记录了猫外侧膝状核中单个细胞对垂直条形刺激的反应，该刺激以小增量逐步穿过细胞的感受野。基于刺激在不同位置引起的单次试验响应，我们计算了可以实现的空间分辨率。如果刺激可能落入其接受区域的任何位置，则单个神经元的空间分辨率将比以前报道的游标阈值差两倍。给定猫视网膜中已知的覆盖因子，我们开发了一个两阶段决策模型，以检查如何处理视网膜原位镶嵌中的神经元反应来获得游标敏锐度。为了通过单个细胞的响应来解释心理阈值，刺激必须落在能提供有关刺激位置最多信息的感受野的四分之一处。可替代地，游标敏锐度的绝对心理物理阈值及其对刺激长度的依赖性都可以通过汇集少数全部位于棒刺激一侧的神经元的响应来实现。

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