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Normalized covariance matrices of 16-channel recordings averaged across 81 trials recorded in 7 rats for the compared noise reduction methods. Baseline covariance matrix shows substantial noise correlation across channels, which is dramatically reduced by VR and SVR. AVR provides noticeably improved channel decorrelation. ZCA whitening provides the best channel decorrelation due to change of basis. However, superior channel decorrelation does not necessarily imply better denoising.
