for how How to compute whether representational similarity matrix values are significant

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I am new to RSA analysis in fMRI images. I used SPM 12 for preprocessing and first level analysis of my fMRI images and used RSA-toolbox to compute RDMs (representational dissimilarity matrix) for my conditions in an specific region of the brain. Now I have the RDM mateix for every single subject also have the overall RDM across all subjects. However, RSA-toolbox doesn't report any p value or significance test for the values in the RDM. How can I compute or determine which values in the RDM matrix are significant and which are not? I used pearson's r method for to compute RDMs. In paeticular I want to have an explaination about the mathematics that can be used to test significancy of these values.

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