Pitch (like baseball, lurch forward) - sagittal motion; Roll (roy --> king) - coronal motion; Yaw (aw --> axial) -- horizontal motion
Elaboration: pitch - 'yes' nod (rotation around x-axis); roll - 'no' nod(rotation around z-axis); yaw - 'maybe' nod (rotation around y-axis)
Partial voluming - large voxel sizes bring together distinct elements, water down differences. Small voxels --> higher noise. Large voxels --> less granularity, ability to distinguish; Solution? Blur smaller voxels? Yes.
samples - rows in a matrix (e.g., runs, session, participants); 1st axis/index in a 2D array
features - columns in a matrix (e.g., voxels); like regressors almost in GLM design matrix; 2nd axis/index in a 2D array
sample attributes - categories under which a sample can be binned
Website documenting SPM data structures - http://www.its.caltech.edu/~nsulliva/spmdatastructure.htm
Andy's Brain Blog documentation of data structures - http://andysbrainblog.blogspot.com/2013/02/using-spmmat-to-stay-on-track-ii.html