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Dear BeomJun, Gareth might be able to help you with the specifics of the error you are getting, but in general LCMV beamformer is not a suitable method for analysis of evoked responses and especially auditory evoked responses which have prominent synchronous bilateral activity. I would suggest you use the imaging source reconstruction methods available in SPM for that. Best, Vladimir On Mon, Jul 21, 2014 at 3:02 AM, Beom Jun Min <[log in to unmask]> wrote: > > Dear all, > > I am trying to LCMV beamforming with event-related potential experimental > data. > > My paradigm is oddball paradigm. > > Therefore I select the active condition as target stimuli data (the number > of trials is approximately 180) > Then I select the baseline condition with standard stimuli data (about 820 > trials) > And I choose the offset as 200 ms and duration as 400 ms respectively. > > > However, an error message has occurred: > > *Error using spm_eeg_ft_beamformer_lcmv (line 220)* > *Design windows missepcified* > > Accidentally, I select the active condition with standard, and the > baseline condition with target stimuli respectively. (opposite of the upper > case) > > In this case, some steps have proceeded, but eventually, following error > message has occurred. > > *Reference to non-existent field 'reducerank'.* > > *Error in spm_eeg_ft_beamformer_lcmv (line 387)* > * if cfg.reducerank, %% follow up rank reduction and remove redundant > dimension from lead fields* > > Could anyone help me with this issue? > > With regards > > > -- > BeomJun Min, M.D. > > Department of Medical System Engineering (DMSE) > Gwangju Institute of Science and Technology (GIST) > 261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju > 500-712, Republic of Korea (South) > Phone: +82-62-715-3266 / Fax: +82-62-715-3244 > E-mail: [log in to unmask], http://bmssa.gist.ac.kr >