Hi Bob,

Would it be possible to add a option to waver program something like "-tstim_AM2", such that it can output the two convolved regressors, one related to constant amplitude and other related to amplitude modulation.

One other question I have is a conceptual one and it will give you some idea why I am requesting the above option with waver.

The current -stim_times_AM2 option in 3dDeconvolve, only accounts for variance based on the changes in the some external measure like RT only WITH-IN the same class (condition) but not across the conditios. But say if one is interested to account for RT variance across ALL the trials in the experiment (not just within condition), then I thought one way to do this is to create a single RT modulation regressor and each trial amplitude of that regressor will be proportional to the difference between each events AM value and the mean value of ALL the trials in the experiment. Please let me know if my thinking is correct here and if you agree then providing the above requested option with waver will help me in creating the RT modulated regressor.

I understand that if the ampltiude modulation component has some kind of interaction based on the condition type, then it will not be a good model. But I am not sure how to account for both with-in and across condition amplitude modulated variance in the same model and any thoughts on this will be greatly appreciated.

Thanks for your time and support.

Thanks,
Srikanth.