Time-freqeucny analysis results with Brainstorm vs. EEGLab

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Hi
I wonder what can be the reason of getting different time-freqeucny analysis results with Brainstorm vs. EEGLab. With Brainsrom the maximal high gamma oscillation is over over AF7 and when I do source localisation it is localized in the frontal lobe. But with EEGLab maximal high gamma oscillation is over Cz:

I am more convenient with Brainstorm results, because in general EEGLab always shows maximal activity over Cz when we create topoplots. I wonder if the discrepancy can be due to different approachs in analysis. In Brainstorm I used Morlet transform in EEGLab it should be multitaper.

Thanks

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A post was merged into an existing topic: Time-frequency analysis, Morlet wavelets