Back to PLS HelpMultiple Voxels Extraction vs. RF plot
Posted on 08/26/10 21:22:33
Number of posts: 16
Hi,
In a ER fMRI analysis I've just run, I have noticed that there is a discrepancy in extracting response function data from PLS when you use either "Multiple Voxels Extraction" or the "Response Function Plot" option.
When using multiple voxels extraction, all my RF plots were basically flipped upside down relative to what I got when using the "Response Function Plot" option. I have checked and double checked and can't figure out why this is happening.
Has anybody encountered this issue before?
I am using version 5.091211.
Regards,
Reece
In a ER fMRI analysis I've just run, I have noticed that there is a discrepancy in extracting response function data from PLS when you use either "Multiple Voxels Extraction" or the "Response Function Plot" option.
When using multiple voxels extraction, all my RF plots were basically flipped upside down relative to what I got when using the "Response Function Plot" option. I have checked and double checked and can't figure out why this is happening.
Has anybody encountered this issue before?
I am using version 5.091211.
Regards,
Reece
Replies:
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Posted on 08/27/10 11:53:56
Number of posts: 291
I tested this function, and did not find any discrepancy. Probably the following information could help you to solve your problem.
Rows of data from "Multiple Voxels Extraction" is stacked in a way that "subjects in conditions in group". i.e. it should look like this:
This is in the same order as the datamat. Thus, it is very convenient for Seed PLS.
On the other hand, rows of data exported from "Response Function Plot" is indicated by "st_evt_list" variable, and the different numbers in this variable represents different conditions.
If problem persists, please upload all the .mat files to your ftp server, and send me the link, so I can duplicate your problem.
Jimmy
Rows of data from "Multiple Voxels Extraction" is stacked in a way that "subjects in conditions in group". i.e. it should look like this:
group1 condition1 subject1
group1 condition1 subject2
... ... ...
group1 condition2 subject1
... ... ...
group2 condition1 subject1
... ... ...
group1 condition2 subject1
... ... ...
group2 condition1 subject1
This is in the same order as the datamat. Thus, it is very convenient for Seed PLS.
On the other hand, rows of data exported from "Response Function Plot" is indicated by "st_evt_list" variable, and the different numbers in this variable represents different conditions.
If problem persists, please upload all the .mat files to your ftp server, and send me the link, so I can duplicate your problem.
Jimmy
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