Usage

Mapping Habits• When mapping data from volume to surface domains★ If mapping assigns multiple voxels to one node➥ How do you deal with functional datasets?➭ Do you average statistics?➭ Do you apply a threshold before or after averaging?» What if some of the voxels are active and some are not?➥ These problems are best avoided by:➭ Mapping the time series data onto the surface➭ Performing statistical analysis directly in the surface domain using3dXXX AFNI programs• When combining surface data across subjects★ Same concerns as with volumetric group analysis• You can also create volumetric data from surface-based data★ use 3dSurf2Vol, the inverse of 3dVol2Surf29 Oct 2009 SSCC/NIMH 49