I'm working with MR data and want to overlay a statistical map on top of it. I've created a montage of the imaging data; then a same statistical map that is thresholded at significance level (p <= 0.5). What I'm trying to do is overlay the thresholded statistical map with the jet colormap so that non-significant pixels (with value 0) are not shown. This would look like an "activation map" in fMRI analysis.
Here's a contrived example of the code I'm using that isn't working:
img = 1500*rand(100,100);
sig_thresh = zeros(size(sig));
sig_thresh(find(sig<=0.05)) = 1;