Pietrini, Pietro and Ricciardi, Emiliano and Furey, Maura L. Cholinergic enhancement during working memory improves information processing in the human brain: effects of age and task difficulty. In: 12th World Congress of Psychophysiology. The Olympics of the Brain, 18-23 September 2004, Thessaloniki, Greece ISSN 0167-8760. (2004)