How can I see the numerical value stored in a voxel?
A label showing the values of the current Anatomy, Function, and Threshold dataset bricks at the crosshair point is at the bottom of the rightmost column in the “Define Function” control panel. This label is only active when all three viewing windows are open at once. (This is due to the way that AFNI accesses data bricks.) If you want to see the voxel values, but don’t want to see all the image windows, open all the image windows anyway and just iconify (minimize) the ones you don’t care about.