Trial Parameters
Brief Summary
The purpose of this study is to use brain imaging technology to measure changes in blood flow to areas in the brain as individuals perform intellectual tasks. This study will use functional magnetic resonance imaging (fMRI) to examine blood flow to areas of the brain as participants engage in tasks associated with visual perception, visual recognition, and memory.
Eligibility Criteria
* INCLUSION CRITERIA: * Healthy adults, with at least a high school education, aged 18 to 65 years, will be recruited to participate in the study. * Able to read and write in English to guarantee understanding of all written and spoken instructions, which are in English. EXCLUSION CRITERIA: Subjects will be excluded if they: * have evidence of, or a history of: * major medical, neurological or psychiatric illness * serious head injury * learning disability-drug or alcohol abuse or dependence in the past 3 months, except nicotine -are taking prescription drugs or supplements that may affect brain function- -have serious vision or hearing problems In addition to the above, additional exclusion criteria apply for all MRI studies: * Female subjects who are pregnant or have a positive pregnancy test 24 hours prior to an experiment will be excluded from neuroimaging studies. * All subjects will be questioned prior to MRI scanning for possible occupational exposure to metal slivers or shaving