I don't think there is anything wrong with what you have. Is there a
problem? You could shorten it to something like 240sec or so.
On 6/20/14 1:43 PM, charujing123 wrote:
Hi doug,
Th?anks doug.
In our experiment, there are 324s, and TR=2s, two kinds of stimulus.
Each one consisted of 3 components(cue 500ms + fixation 500ms +
picture 500ms), and will be presented with a interval of 1.5s. After
stimulus onset, followed by reaction time. One stimulus will repeat 41
times, the other 40 times.
Based on optseq2 --ntp 162 --tr 2 --psdwin 0 20 --ev ev1 2 40 --ev
ev2 2 40 --nkeep 2 --o ex2 --nsearch 1000, how should I modify to get
a efficient sequence, as I have no idea about NULL design.
Thanks again
All the best
Rujing Zha
2014-06-20
------------------------------------------------------------------------
charujing123
------------------------------------------------------------------------
*? ??:*Douglas Greve <gr...@nmr.mgh.harvard.edu>
*? ???:*2014-06-20 16:51
*? ?:*Re: [Freesurfer] some questions about optseq
*? ??:*"freesurfer"<freesurfer@nmr.mgh.harvard.edu>
*? ?:*
I don't understand what you are trying to do. Can you elaborate? There
is no way to make optseq produce a sequence where two events always
occur in a certain order
On 6/20/14 4:27 AM, charujing123 wrote:
Hi FS experts,
I try to design the schedule by optseq2. However it is beyond my
ability as our experiment has a little complicated.
Here is our goal:
two successive trials decide condition. For example, this is our
sequence:2 2 1 1 2 2 2 1 1 2 2 1 2 1 1 2 1 2 2 1 1 1 1 2 2 2 2 1 1 1 2 1 2 1 1 1 1 1 1 2 1 2 1 2 1 2 1 2 2 1 1 2 2 2 2 2 2 1 1 1 2 2 2 1 2 2 2 2 1 2 2 1 1 2 1 1 2 1 1 1 2
.22 and 11 is the same condition(this condition has 40 repeats); 12
and 21 is the same condition(this condition also has 40 repeats).
That is to say, there are two conditons in this run. 81 trials in
this run, and each trial has 1.5s intervels. And mean intertrial
intervals is 3.5s. Our TR is 2s.
According the efficiency about these two conditions, how could I
design the intertrial intervals to get a appropriate sequence?
I tried this:
optseq2 --ntp 203 --tr 2 --psdwin 0 20 --ev ev1 2 40 --ev ev2 2 40
--nkeep 2 --o ex2 --nsearch 1000
Although it echo a result, I know, it is not what I need, because of
every condition having two trials. So how I complete that?
Thanks.
All the best.
Rujing Zha
2014-06-20
------------------------------------------------------------------------
charujing123
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