[Eeglablist] Cluster-based permutation tests for 3 conditions

[Angel Caputi]

I wonder What kind of post-hoc test can be used for testing that the
cluster site (i.e. combination of times and channels) we need to use for
spatio-temporal localization.  Would not be the use a sencond test on the
cluster region a kind of double dipping? What would the correct procedure
for testing where the spatio-temporal pattern differ?
Sincerely
Angel


2017-09-09 9:49 GMT-03:00 Stephen Politzer-Ahles <politzerahless at gmail.com>:

> Cluster-based permutation tests are not necessarily between two
> conditions. They operate on any test statistic; this test statistic can be
> an F test from an ANOVA with three conditions. Just like with a
> two-condition permutation test, if the test comes out significant this will
> tell you that the three conditions differ in this dataset (whatever
> selection of channels, times, and frequency bands you looked at), and the
> cluster extent can give you an idea of what channel/time/frequency cluster
> is driving that difference. With an F-test, you would need to do follow-up
> comparisons to see which particular conditions are driving the difference.
>
>
> ---
> Stephen Politzer-Ahles
> The Hong Kong Polytechnic University
> Department of Chinese and Bilingual Studies
> http://www.mypolyuweb.hk/~sjpolit/
> <http://www.nyu.edu/projects/politzer-ahles/>
>
> On Thu, Sep 7, 2017 at 9:43 AM, 時本真吾 <tokimoto at mejiro.ac.jp> wrote:
>
>> Dear EEGLAB users,
>>
>> I usually perform cluster-based permutation tests for my EEG analyses. I
>> understand permutation tests are tests between two conditions. However, I
>> have realized that the test results can be presented for the comparison of
>> three conditions, as is shown by the image file below. I usually perform
>> the test from the GUI of EEGLAB. Could anyone tell me how I should
>> understand the test results? Thank you in advance.
>>
>> http://tokimoto.o.oo7.jp/ERSP_sample.jpg
>>
>> ******************************************
>> Shingo Tokimoto, Ph.D.
>> in Linguistics and Psychology
>> Department of Foreign Languages
>> Mejiro University
>> 4-31-1, Naka-Ochiai, Shinjuku, Tokyo,
>> 161-8539, Japan
>> tokimoto at mejiro.ac.jp
>> ******************************************
>>
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>
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