Effects of noise correlations on information encoding and decoding
Effects of noise correlations on information encoding and decoding
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DOI：
10.1152/jn.00919.2005
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发表时间：
2006-06-01
影响因子：
2.5
通讯作者：
Lee, Daeyeol
中科院分区：
文献类型：
--
作者：
Averbeck, Bruno B.;Lee, Daeyeol
反应变异性通常与神经元群体相关，这些噪声相关性可能在信息编码中发挥作用。在以前的研究中，这种可能性已经从编码和解码的角度进行了研究。在这里，我们使用d素数和相关的信息措施，以检查如何从这两个角度的噪声相关性的研究是相关的。我们发现，对于一对神经元，当噪声相关性对编码信息的影响获得其最大的正值或负值时，噪声相关性对信息解码的影响可以为零。此外，当噪声相关性对信息解码产生影响时，它对编码的信息不会产生影响。我们还测量了噪声相关性对同时记录的辅助运动区神经元的信息编码和解码的影响，以了解d素数对神经反应中实际存在的信息的解释程度，以及噪声相关性如何影响真实的数据的编码和解码。这些分析表明，d素数为我们的神经元群体中的信息编码和解码提供了准确的度量。我们还发现，噪声相关性对信息编码的影响略大于噪声相关性对信息解码的影响，但两者都相对较小。最后，正如理论上预测的那样，对于较大的集合（3 - 8个神经元），相关性的影响略大于神经元对。
Response variability is often correlated across populations of neurons, and these noise correlations may play a role in information coding. In previous studies, this possibility has been examined from the encoding and decoding perspectives. Here we used d prime and related information measures to examine how studies of noise correlations from these two perspectives are related. We found that for a pair of neurons, the effect of noise correlations on information decoding can be zero when the effect of noise correlations on the information encoded obtains its largest positive or negative values. Furthermore, there can be no effect of noise correlations on the information encoded when it has an effect on information decoding. We also measured the effect of noise correlations on information encoding and decoding in simultaneously recorded neurons in the supplementary motor area to see how well d prime accounted for the information actually present in the neural responses and to see how noise correlations affected encoding and decoding in real data. These analyses showed that d prime provides an accurate measure of information encoding and decoding in our population of neurons. We also found that the effect of noise correlations on information encoding was somewhat larger than the effect of noise correlations on information decoding, but both were relatively small. Finally, as predicted theoretically, the effects of correlations were slightly greater for larger ensembles (3 - 8 neurons) than for pairs of neurons.