to my knowledge I haven't resampled/reoriented the data. Here is the orientation info when I 3dinfo my data:
Data Axes Tilt: Plumb
Data Axes Orientation:
first (x) = Anterior-to-Posterior
second (y) = Superior-to-Inferior
third (z) = Left-to-Right [-orient ASL]

Is that what you would expect?

I'm confused about how to determine which slices I want. When the z-value changes in the AFNI window, the cursor moves along the dorsal/ventral axis as seen here: Image 1 Image 2. That's not what I think of as slices-- I would expect the cursor to move in an anterior-posterior direction. It's possible that I'm thinking about this the wrong way, but I'd appreciate your input!