Maintenance and Manipulation in Spatial Working Memory: Dissociations in the Prefrontal Cortex. - David C. Glahn; Jihie Kim; Mark S. Cohen; Veli-Pekka Poutanen; Sebastian Therman; S. Bava; Theo G. M. van Erp; Marko Manninen; Matti Huttunen; Jouko Lönnqvist; Carl-Gustav Standertskjöld-Nordenstam; Tyrone D. Cannon (NeuroImage, 2002)