Have you tried using optseq2? Haven't used optseq in a long time:).

Mithra wrote:

Hello,

I am trying to use the optseq command for 2 conditions of 30 trials each with TR = 2

optseq -ntp 120 -TR 2 -npercond 30 30 -tpercond 3 3 -nsessions 3 -label critical independent -o TestFile

I get the following result: -0.000 1 3.000 critical 4.000 1 3.000 critical 8.000 0 2.000 independent

The program adds an extra 1 second at the end of each trial. I want each trial dureation as 3 seconds. This is the true even when when I don't give the option -TR. ( I am assuming the default TR is taken as 2 by the program). I guess the program tries to start to each trial at mutiples of TR. Is this true?

I want my trials not to have any intervals between trials. I get my desired results by "lying" to the program that the TR is 1.

"optseq -ntp 180 -TR 1 -npercond 30 30 -tpercond 3 3 -nsessions 3 -label critical independent -o TestFile" gives the results as:

-0.000 1 3.000 critical 3.000 1 3.000 critical 6.000 1 3.000 independent

Is this the right way to go?

Thanks. Mithra. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer