Reply-To: | | [log in to unmask][log in to unmask]] on behalf of [log in to unmask] [[log in to unmask]] >> Sent: 02 May 2012 19:49 >> To: [log in to unmask] >> Subject: [SPM] MEG group comparison neuromag >> >> Dear SPM users, >> >> I tried to do a group inversion with neuromag MEG data (2 conditions, 18 subjects). When I include MEGPLANAR I get 0 spatial modes and NaNs. For the MEG I get 1 spatial mode (if I invert individually I get 66 modes for MEG and 104 modes for MEGPLANAR). So, if I only use MEG to get a solution, I get for all subjects, conditions the same solutions (and a very unlikely one, beam former, MNE and LORETA get visual cortex activity, GS group inversion gets auditory activity that is equal for all conditions and subjects). >> >> I saw similar postings in the SPM list in 2010 and it was advised to wait for a newer SPM version. I have used the newest 2012 SPM version. I did tSSS with the MEG data, but I do not know if SPM applies the SSP vectors to the data (it shouldn't when using tSSS). Could this be the problem? >> >> Best, >> >> Stephan >> >> ________________________________________________________ >> Stephan Moratti, PhD >> >> see also: http://web.me.com/smoratti/ >> >> Universidad Complutense de Madrid >> Facultad de Psicología >> Departamento de Psicología Básica I >> Campus de Somosaguas >> 28223 Pozuelo de Alarcón (Madrid) >> Spain >> >> and >> >> Center for Biomedical Technology >> Laboratory for Cognitive and Computational Neuroscience >> Parque Científico y Tecnológico de la Universidad Politecnica de Madrid >> Campus Montegancedo >> 28223 Pozuelo de Alarcón (Madrid) >> Spain >> >> >> email: [log in to unmask] >> Tel.: +34 679219982 >> >> El 02/05/2012, a las 20:03, Liam Mason escribió: >> >>> Hi Carlos, >>> >>> Did you get any answer of if it is possible to extract %SC from a group of subjects? I'm afraid the only way I know is to do them iteratively as you say. If marsbar is able to do it from a second-level (group) SPM file, then would be keen to know! >>> >>> >>> Liam >>> >>> --- >>> School of Psychological Sciences >>> University of Manchester >>> 0161 275 2692 >>> >>> ________________________________________ >>> From: SPM (Statistical Parametric Mapping) [[log in to unmask]] on behalf of Ming-Tsung Tseng [[log in to unmask]] >>> Sent: 24 April 2012 18:14 >>> To: [log in to unmask] >>> Subject: Re: [SPM] Compare 2 methods to extract %signal change in MarsBaR >>> >>> Hi Matthew, >>> >>> Excellent to get your clear explanation!! >>> >>> So I can use Method 2 to extract Beta values in a group of subjects, right?? >>> >>> One more question: Since %SC and Beta value can both represent neural response in an ROI, which one is better?......I mean, if I want to extract %SC, I have to use Method 1 which will be performed subject by subject and time-consuming (or any time-saving way to get %SC within many ROIs in a group of subjects)? >>> >>> Thanks indeed! >>> >>> Carlos > >[log in to unmask] |