TEMPORAL DECORRELATION - A THEORY OF LAGGED AND NONLAGGED RESPONSES IN THE LATERAL GENICULATE-NUCLEUS
TEMPORAL DECORRELATION - A THEORY OF LAGGED AND NONLAGGED RESPONSES IN THE LATERAL GENICULATE-NUCLEUS
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DOI：
10.1088/0954-898x/6/2/003
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发表时间：
1995-05-01
影响因子：
7.8
通讯作者：
ATICK, JJ
中科院分区：
文献类型：
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作者：
DONG, DW;ATICK, JJ
当感光器逐帧采样时，自然随时间变化的时间相关性非常显著。这些相关性甚至在视网膜处理之后仍然存在，因此，在自然激活条件下，发送到外侧膝状体核（LGN）的信号在时间上是冗余的或低效的。我们探讨的假设，LGN的关注，除其他事项外，通过主动时间去相关的视网膜信号，以同样的方式，视网膜通过空间去相关传入的图像提高效率的视觉表示的效率。使用一些最近测量的时变图像的统计特性，我们预测的时空感受野，实现这种去相关。结果表明，由于神经元的非线性，时间去相关需要两种响应类型，滞后和非滞后，就像空间去相关需要开和关响应类型。预测的LGN细胞的调谐和响应特性与最近的生理实验中观察到的定量比较。
Natural time-varying posses significant temporal correlations when sampled frame by frame by the photoreceptors. These correlations persist even after retinal processing and hence, under natural activation conditions, the signal sent to the lateral geniculate nucleus (LGN) is temporally redundant or inefficient. We explore the hypothesis that the LGN is concerned, among other things, with improving efficiency of visual representation through active temporal decorrelation of the retinal signal much in the same way that the retina improves efficiency by spatially decorrelating incoming images. Using some recently measured statistical properties of time-varying images, we predict the spatio-temporal receptive fields that achieve this decorrelation. It is shown that, because of neuronal nonlinearities, temporal decorrelation requires two response types, the lagged and nonlagged, just as spatial decorrelation requires on and off response types. The tuning and response properties of the predicted LGN cells compare quantitatively well with what is observed in recent physiological experiments.