[Eeglablist] different ERSP values of the same dataset used in two studies

[Arnaud Delorme]

Dear Muhammad,

first, you did not have to create 2 studies, you may only create 1 study with 2 designs. It might be that there is a strange interactions between your STUDY.
To really investigate if there is a problem, we would have to look at your STUDY.
If you would not mind to compress it and upload it to ftp://sccn.ucsd.edu/incoming/

Then submit a bug report at http://sccn.ucsd.edu/bugzilla with the information below (and the name of your STUDY on the server above) that would be great. You will have to create a bugzilla user but it only takes a second. Also, please provide additional details as to which cell of the erspdata and specdata you are comparing.
Thanks,

Arno

> When I plot ERSP/PSD in the STUDY of ALL 3 groups, using EEGLab GUI, I get on several electrode locations very hight values for ERD over all frequencies (like noise). When I look at the same data in a s STUDY of 2 group, plots look fine. Numerical values also look different for the same dataset in two studies.
> The numerical values are obtained using command:
> [STUDY erspdata ersptime erspfreqs] = std_erspplot(STUDY, ALLEEG, 'channels', {'Pz'})
> [STUDY pecdata specfreqs] = std_specplot(STUDY, ALLEEG, 'channels', {'Pz'})
> The scalp map is also looks different for several electrode in both studies. The numerical values are shown below:
> PSD:
> For G1:
> Ch1: 49.1689 (study1), 51.1606(study2)
> Ch2: 29.1974 (study1), 51.2525 (study2)
> Ch3: 35.4119 (study1), 50.7535 (study2)
> ERSP
> For G1:
> Ch1: -0.1233   (study1), 0.4490 (study2)
> Ch2: -10.7306 (study1), 0.4834 (study2)
> Have anybody experienced similar and what it the solution?
> Many thanks
> Muhammad Abul Hasan
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