 In phase I of the study, volunteers will be seated in front of a computer monitor with their right hands on a keyboard and respond to visual cues presented on the monitor by pressing the associated, finger-specific keys as quickly and accurately as possible. Each volunteer will be presented only the standard visuospatial or the novel mirror cues, defining the two reaction time task paradigms and experimental groups. In phases II and III of the study, a similar task will take place while subjects undergo magnetic resonance imaging scanning either in the presence or absence of an odor. In addition to the motor learning tasks above, volunteers will have the option to participate in genetic testing for normal genetic variability that may affect motor learning. 