1. Association of Life Activities With Cerebral Blood Flow in Alzheimer Disease: Implications for the Cognitive Reserve Hypothesis Scarmeas, Nikolaos; Zarahn, Eric; Anderson, Karen E.; Habeck, Christian G.; Hilton, H. John; Flynn, Joseph; Marder, Karen; Bell, Karen L.; Moeller, James R.; Sackeim, Harold A.; Van Heertum, Ronald L.; Stern, Yaakov 2003 Articles Cognition in old ageDementiaAlzheimer's diseaseCerebral circulationCognitionBrain--AbnormalitiesPathologyMental healthNeurosciences