Re: [caret-users] caret docs; Display Control especially
Donna: A belated thanks for the reply... Burying your head in David's PALS paper is indeed the best way .. belated because I was on a hastily-arranged trip to the UK, during which I avoided having too short of a plane ride... (And you can't whip through in a short plane ride.) So now I'm a lot more up to speed (not to mention jet-lagged). Thanks again for your replies and suggestions. Graham
[caret-users] Fishy brainfish sampling
Folks: The brainfish algorithm is described here: http://brainmap.wustl.edu/caret/html4.6/ map_fmri_to_surface/map_fmri_to_surface_dialog.html ... as picking up negative voxels if there are no positive ones around. Couple of issues: 1. We don't seem to be able to get negative voxels to appear at all when using the brainfish mapping algorithm. This is for a volume that has been thresholded, hence lots of zero voxels, and it has well separated islands of positive and negative values. (And applying mapping other than brainfish indeed shows the negative regions in caret -- so we *think* we know how to get the rest of the display settings right...) So the question is: are you sure that the negative aspect of this mapping algorithm is currently working? Also, is there a tool for inspecting metric files? (Or conversion to text?) 2. Would it make sense to have an alternative brainfish strategy which allocates to a node the voxel value with the highest *absolute* value, instead of any positive beats any negative? This is particularly a concern for fMRI input that has not been thresholded. Thanks, Graham
[caret-users] caret docs; Display Control especially
Folks: We are trying to get up to speed on caret, and find ourselves thoroughly stalled by holes in the docs, but suspecting that we may be missing some important doc. In particular, we really need a guide as to what everything in the UI actually does. Case in point: Display Control dialog: There's a great deal of functionality there, but rather inscrutable without docs: The GUI Reference Guide doesn't list the Display Control dialog, so has this not been documented, or is it documented somewhere else? We want to know, for example, how to operate the Metric Threshold settings. There are Column, Average Area and User widgets -- what are they all about? We're pretty certain that they somehow filter or color the data to be displayed, but how is not clear. Thanks, Graham
