> -----Original Message-----
> From: SPM (Statistical Parametric Mapping)
> [mailto:[log in to unmask]] On Behalf Of Geraint Rees
> Sent: Thursday, October 11, 2001 7:24 AM
> To: [log in to unmask]
> Subject: Re: group analysis
> For a second stage (random effects) group analysis, you would use the
> contrast images (con*.img) not the t-maps (spmT*.img). For a
> first stage
> (fixed effects) group analysis, you would generally estimate
> a design matrix
> that combined all subjects/sessions. So in either case, you
> wouldn't use
> t-maps from individual subjects in a group analysis.
Just an addendum here. You could, however, use the con*.img(s) from
either a number of individual analyses or a joint analysis of several
subjects. My understanding is that the com*.img(s) will be the same in
either case.
VDC
|