411 REFERENCE · Wikibooks
SPM/PPI
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Psychophysiological Interactions (PPI)
http://www.fil.ion.ucl.ac.uk/spm/doc/biblio/Keyword/PPI.html
http://www.fil.ion.ucl.ac.uk/spm/data/attention/#PPI
http://scan.oxfordjournals.org/content/7/5/604.full
http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/PPI