Posted by Lukas Pezawas on November 19, 2002 at 11:11:17:
Hi AFNI experts!
We are conducting a mixed trial (several pure event related "block" with a baseline period in between, 2 runs of 183 volumes, TR=3000msec; the stimulus is on for 1500 msec=1/2 TR)
We used waver to create the reference function with a command similar like this:
waver -GAM -dt 3.0 -tstim `cat timevector.1D` -numout 183 > waverfile.1D
As far as I understand, this reference function might be not the best reference for our actual data since the stimuli are presented in an event related manner...
I am looking for a way in AFNI, how I can get an impression based on the real data what the real IRF is looking like in regions we are interested in in order to specify waver in a more accurate way.
I did not find too much about that in the message board or in the AFNI documetation.
I am also not sure, if the data generated by the -iresp option in 3dDeconvolve would be of any value or 3ddelay (and how I can extract the delay value..)
Any suggestion would be appreciated...
Thanks,
Lukas