Figure 6From: Fast PCA for processing calcium-imaging data from the brain of Drosophila melanogasterExample for spatial ICA. Performing ICA on the principal component images matrix SPCA. We show all spatial independent components that capture glomeruli. Top: ICA was run after exact PCA, bottom: ICA was run after approximate PCA with a 1% or 15%, respectively, pixel sample (covariation probabilities). Closest matches are placed in the same column.Back to article page