Correlated neuronal discharges that increase coding efficiency during perceptual discrimination
Correlated neuronal discharges that increase coding efficiency during perceptual discrimination
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DOI：
10.1016/s0896-6273(03)00287-3
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发表时间：
2003-05-22
期刊：
影响因子：
16.2
通讯作者：
Salinas, E
中科院分区：
文献类型：
--
作者：
Romo, R;Hernández, A;Salinas, E
在感觉辨别任务中，多个感觉神经元的反应必须结合起来才能产生选择。反应的最佳组合取决于它们对感官刺激的依赖性和它们在试验中的共同波动，即噪声相关性。正相关噪声被认为是有害的，因为它限制了类似调谐神经元群体的编码准确性。然而，不同调谐神经元之间的正相关波动实际上增加了编码准确性，因为它们允许在没有信号损失的情况下减去常见噪声。这是证明与记录的数据从次级体感皮层的猴子执行振动触觉的歧视任务。结果表明，正相关性并不总是有害的，可以利用皮层网络来增强待区分特征的神经表征。
During a sensory discrimination task, the responses of multiple sensory neurons must be combined to generate a choice. The optimal combination of responses is determined both by their dependence on the sensory stimulus and by their cofluctuations across trials-that is, the noise correlations. Positively correlated noise is considered deleterious, because it limits the coding accuracy of populations of similarly tuned neurons. However, positively correlated fluctuations between differently tuned neurons actually increase coding accuracy, because they allow the common noise to be subtracted without signal loss. This is demonstrated with data recorded from the secondary somatosensory cortex of monkeys performing a vibrotactile discrimination task. The results indicate that positive correlations are not always harmful and may be exploited by cortical networks to enhance the neural representation of features to be discriminated.