Back to PLS HelpPLS set up question
Posted on 03/10/10 18:15:20
Number of posts: 34
Hi,
I have 2 subject groups for an fMRI study - out of X amount of runs each subject completed I want to examine the best Y number of runs. The order of the condition epoch within each run is not identical for all 4 runs for each subject; however the timing of each condition is identical. For example:
Subject1
best-run1
0 Baseline-mood
1 Happy
5 Sad
10 Sad
15 Happy
Subject1
best-run2
0 Baseline-mood
1 Sad
5 Happy
10 Sad
15 Happy
.....
Subject2
best-run1
0 Baseline-mood
1 Sad
5 Sad
10 Happy
15 Happy
Subject1
best-run2
0 Baseline-mood
1 Happy
5 Sad
10 Sad
15 Happy
.....
Is it possible to set up PLS to examine group/condition differences as a block fMRI design? If so how would I set up the Session files? Please help - thanks in advance!
- Miyoung
Replies:
Untitled Post
I'm Online
Posted on 03/11/10 17:52:48
Number of posts: 291
Technically, I didn't see any problem here. You should be able to set up PLS session file as usual, and each session file for each subject.
e.g., For subject 1:
You can enter subj1 as "Datamat Prefix"; input Baseline, Happy, Sad after click "Edit Conditions"; and put 4 after "Number of Runs", and then click "Edit Run".
Enter the scan number and "Browse" the scan data. Then, enter the onset data:
For Run1:
Baseline: 0
Happy: 1 15
Sad: 5 10
For Run2:
Baseline: 0
Happy: 5 15
Sad: 1
...
If you want to run Block design, then you also have to provide the length of the block. This is what I will do based on your description.
Jimmy
e.g., For subject 1:
You can enter subj1 as "Datamat Prefix"; input Baseline, Happy, Sad after click "Edit Conditions"; and put 4 after "Number of Runs", and then click "Edit Run".
Enter the scan number and "Browse" the scan data. Then, enter the onset data:
For Run1:
Baseline: 0
Happy: 1 15
Sad: 5 10
For Run2:
Baseline: 0
Happy: 5 15
Sad: 1
...
If you want to run Block design, then you also have to provide the length of the block. This is what I will do based on your description.
Jimmy
Untitled Post
Posted on 03/15/10 15:39:48
Number of posts: 34
I figured that's how I'd do it - I just wanted to make sure. Thanks for your help Jimmy!!
-Miyoung
Login to reply to this topic.
