?url_ver=Z39.88-2004&rft_id=10.1176%2Fappi.ajp.162.11.2061&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Freo%2C+Ulderico&rft.aufirst=Ulderico&rft.aulast=Freo&rft.issn=0002-953X&rft.date=2005&rft.title=American+Journal+of+Psychiatry&rft.atitle=Pharmacological+Modulation+of+Prefrontal+Cortical+Activity+During+a+Working+Memory+Task+in+Young+and+Older+Humans%3A+A+PET+Study+With+Physostigmine&rft.issue=11&rft.pages=2061-2070&rft.volume=162&rft.genre=article