%C New York, USA %T Cholinergic Enhancement during Working Memory Eliminates Regional Cerebral Blood Flow (rCBF) Modulation Associated with Task Difficulty in Prefrontal Cortex %D 2003 %A Maura L. Furey %A Emiliano Ricciardi %A Stanley I. Rapoport %A Mark B. Schapiro %A Pietro Pietrini %L eprints3318 %I Elsevier %B Neuroimage %O Proceedings of the 9th Annual Meeting of the Human Brain Mapping Organization