I’d like to perform RSA comparing the neural RDM with a behavioral RDM built from individual ratings, where each subject in our fMRI study rated each stimulus for a certain attribute on a scale from 1 to 6. Now, I’m wondering what the best way is to compute the pairwise (dis)similarity of these stimulus-ratings for RSA. Can one simply take the difference between two ratings? Or should the ratings be z-scored before taking the difference? Or should one not use the rating-values at all but take the difference of the ranks of the ratings (cf. https://www.sciencedirect.com/science/article/pii/S1053811916304591)?
Thanks in advance for your help!
All the best,