relation: http://eprints.imtlucca.it/3097/ title: Cholinergic modulation on brain response to working memory as task difficulty increases in young and older subjects creator: Ricciardi, Emiliano creator: Pietrini, Pietro creator: Furey, Maura L. subject: RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry publisher: Elsevier date: 2008 type: Article type: PeerReviewed identifier: Ricciardi, Emiliano and Pietrini, Pietro and Furey, Maura L. Cholinergic modulation on brain response to working memory as task difficulty increases in young and older subjects. International Journal of Psychophysiology, 69 (3). 187 - 188. ISSN 0167-8760 (2008) relation: http://www.sciencedirect.com/science/article/pii/S0167876008002808 relation: 10.1016/j.ijpsycho.2008.05.500