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Spike Triggered Covariance in Strongly Correlated Gaussian Stimuli

Figure 5

Analysis of salamander retinal ganglion cells.

(A) Number of significant dimensions for 22 RGCs presented with a strongly correlated stimulus, before (left) and after (right) using our correction scheme. Gray lines represent single cells, and red lines represent the standard deviation. (B) Significant (insignificant) eigenvalues of in red (black) and the null eigenvalue distribution (blue) for an example cell. Null distribution were constructed using the global approach with shuffled spike trains. Without the correction scheme there is only one significant dimension. The corresponding visual feature is shown in the inset before decorrelation. (C) Same for the corrected covariance matrix . Here there are six significant dimensions with spots likely representing the subunits within the cell's receptive field. The gray shade indicates the range of the null distribution used to determine significance.

doi: https://doi.org/10.1371/journal.pcbi.1003206.g005