Hi everyone,
I really appreciate the authors for creating the wonderful decoding toolbox, TDT.
Let me ask about how to perform GLM with representation similarity analysis (RSA-GLM) in TDT.
I would be very happy if you could give me some tips.
I would like to obtain beta values of three factors (behavior dissimilar matrix) against neural (dis)similarity matrix across each trial for each participant.
I believe that what I want to do is very similar to this previous post by Phil: RSA on individual behavioral ratings
But I could not find how to correctly perform RSA-GLM in TDT.
My current settings are like this (under version 3.994):
cfg.decoding.software = ‘similarity’;
cfg.decoding.method = ‘classification’;
cfg.decoding.train.classification.model_parameters = ‘zcorr’;
cfg.results.output = {‘rsa_beta’, ‘other’}; % I believe that ‘other’ output values here correspond to Z-correlations across each trial
cfg.design = make_design_rsa(cfg);
This script successfully runs and I could obtain rsa_beta values of each dissimilar matrix as well as a neural similarity matrix for each participant.
However, I am not sure whether cfg.decoding.method = ‘similarity’ is correct, instead of ‘regression.’
If it should be ‘regression’, what kind of parameters should be chosen for cfg.decoding.software?
I hope you will be able to provide the information.
Thank you!
Ryuhei