Fdr correction formula!
Benjamini-hochberg fdr
Just when FMRI researchers were feeling good and secure about the methods they were using, yet another paper has come out in the journal Neuroimageabout how everything you are doing is, to put it mildly, totally wrong.
The article, by Woo, Krishnan, and Wager, points out that one of the most popular correction methods for FMRI data - namely, cluster-correction, or cluster-extent thresholding - is routinely mishandled.
The article, by Woo, Krishnan, and Wager, points out that one of the most popular correction methods for FMRI data - namely, cluster-correction, or cluster-extent thresholding - is routinely mishandled.
This is not to say that you, a typical FMRI researcher, has no idea what he is doing. It is just that, when it comes to cluster-correction thresholding, you are about as competent as a bean burrito.
Cluster-correction is based on the assumption that in an FMRI dataset composed of several tens of thousands of voxels all abutting each other, there is likely to be some correlation in the observed signal between adjacent voxels.
That is, one voxel immediately surrounded by several other voxels is not completely independent of its neighbors; the signal in each will be so