1. Cognitive Reserve Modulates Functional Brain Responses During Memory Tasks: A Pet Study in Healthy Young and Elderly Subjects Scarmeas, Nikolaos; Zarahn, Eric; Anderson, Karen E.; Hilton, H. John; Flynn, Joseph; Van Heertum, Ronald L.; Sackeim, Harold A.; Stern, Yaakov 2003 Articles NeurosciencesCognitionBrain--ImagingBrain--AgingTomography, EmissionMemory--Testing