Hi,
Just to clarify a bit (in the hopes that someone out there may know what is going on with this voxel of interest):
1. Study had 2 control tasks followed by 4 memory tasks (A1 A2 M1 M2 M3 M4)
2. Conducted 3Ddeconvolve on indidividual subjects
3. Used 3dANOVA2 with "-acontra -2 -2 1 1 1 1" to examine BaselinevMemory task effect.
4. The -t stats were related to Baseline & one of the voxels from 3dclust was a region in right PFC that was more active (-ve t value) for Baseline tasks vs Memory (this is consistent with the AFNI display function result too)...this was all done with the Tailarached images.
4. Extracted this voxel peak from the snr*.img using a MNI coords (tal2mni was used to convert) and plotted mean activity for each task...surprisingly the plot shows that the standardized raw activity for this voxel is +ve for the Memory tasks and -ve for the Baseline tasks..this seems to imply that this region is more active during Memory tasks. However, the AFNI -t value suggests that it is more related to the Baseline task. The only explanation I can come up with is that this voxel has a negative beta value. Does this seem the plausible reason for this effect?

Thanks for your help