Miguel, 1- the 'average' referred to in the display question refers to each vertex on the group average surface, and is the mean of all subjects in a group. Ctrl-right click on a vertex to bring up a data plot to see this raw data. the actual display is the p-value (-log10) of the contrast avgA-avgB. negative values means its thinning.
2- the import button just does the work for you. you used to have to do it manually. 3- it using lh_parahippocampal thickness as a covariate (along with groups A and B in your example), so its looking a thickness changes everywhere in relation to lh_parahip thickness. imagine if you had selected hippocampal volume: a reduced size hippocampus would show its effects across a lot of areas of cortex. a positive value means it thickening in those areas. Nick On Mon, 2009-06-22 at 07:47 -0700, Jose Soares wrote: > Hi all, > > I am a little bit confused about the qdec display. I have some simple > questions about two groups A and B: > > 1- In the question, does the average thickness differ between A and B? > How this average is calculated? By the difference between the A > average and B average (avgA-avgB) ? The negative values (normally in > blue) mean that the thickness (average of B) B is higher than A? > > 2- I want to analyze lh parahippocampal thickness. What is the > difference between insert the values manually in the qdec.table.dat > file (like the tutorial) or import ( in subjects - stats data import) > the lh_parahippocampal_thickness from aparc? > > 3- In the question, does the thickness--lh_parahippocampal_thickness > correlation differ between A and B? what for instance a positive value > mean on display? I only expected results in the parahippocampal > area... > > Thaks for the help, > > Miguel. > > > > > ______________________________________________________________________ > Veja quais são os assuntos do momento no Yahoo! + Buscados: Top 10 - > Celebridades - Música - Esportes > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
