Cocaine decreases cortical cerebral blood flow but does not obscure regional activation in functional magnetic resonance imaging in human subjects. - Gollub,R.L.; Breiter,H.C.; Kantor,H.; Kennedy,D.; Gastfriend,D.; Mathew,R.T.; Makris,N.; Guimaraes,A.; Riorden,J.; Campbell,T.; Foley,M.; Hyman,S.E.; et al. (J Cereb Blood Flow Metab, 1998)