Is it possible to conduct an analysis that calculates voxel-by-voxel correlations across ~100 subjects between a continuous variable and the magnitude of the brain activation associated with a task condition within AFNI?
If this type of analysis is possible what program/command would be recommended to implement this? Finally, what would I expect as far as the output AFNI provides is concerned and are there any visualization options that the GUI provides aside from the typical stats files it produces for brain activations. Thank you very much for any guidance you can provide.
You can use 3dttest++ to perform a simple regression analysis. If you want the correlation coefficient, use the formula in following link to covert the t-statistic:
You can use the AFNI GUI ‘afni’ to visualize the results.