1. Single-dose Levodopa Administration and Aging Independently Disrupt Time Production Rakitin, Brian C.; Scarmeas, Nikolaos; Li, Tina; Malapani, Chara Cara Grace; Stern, Yaakov 2006 Articles Human information processingDopaCognition--Age factorsCognitive neuroscienceDopamineAgingNeurosciencesCognitive psychology