Cluster-based nonparametric t-tests in Brainstorm

Discussions
1

Hi I was reading from the brainstorm log page the following:

Some FieldTrip functions can be called from the pipeline editor in Brainstorm. This brings a lot of long-awaited tools for statistical analysis:

Permutation-based non-parametric t-tests
Cluster-based correction for multiple comparisons
This is done with direct calls to FieldTrip functions:
ft_timelockstatistics, ft_sourcestatistics, ft_freqstatistics
New displays for exploring significant clusters

I immediately updated the brainstorm on my pc to the latest version (Oct 9, 2015). However, in the pipeline editor I was not able to find any of the above tools… Any idea why? Your response will be highly appreciated.

2

Just an update. I did see the fieldtrip option for the two-sample t-test, but is it possible to do the nonparametric cluster test for the one-sample case?

3

Not yet, but it will be added at some point.

4

[QUOTE=Francois;9437]Not yet, but it will be added at some point.[/QUOTE]

For now, do you think it makes sense to create a source map file with zero amplitudes (suppose the null hypothesis is mean equal to zero) and use the paired test to achieve one-sample test?

5

I think it would be easier for you to add the missing processes, or help me do it.
I guess there are not many adaptations to do from the existing processes (process_ft_sourcestatistics.m, process_ft_timelockedstatistics.m, process_ft_timefreqstatistics.m).

If you are interested in learning how the programming of processes (=plugins) works, you can read the following page:
http://neuroimage.usc.edu/brainstorm/Tutorials/TutUserProcess

Alternatively, would you be able to tell me what needs to be changed in the FieldTrip calls in these existing processes?

Thanks,
Francois

6

Hi

Just checking in to see if the cluster-based one-sample test had been developed yet

Thanks

7

Nothing new on this front.
Do you have any implementation suggestions to share?

8

Unfortunately I do not. Will See what I can do. Thanks