Sunlight may be related to cognitive function through vitamin D, metabolism, or circadian rhythm regulation. Dr. Shia T. Kent, postdoctoral trainee in the department of epidemiology at the University of Alabama at Birmingham, recently sought to test whether ground and satellite measures of solar radiation are associated with cognitive decline. Co-investigators include Dr. Virginia J. Howard, professor, and Drs. William L. Crosson and Mohammad Z. Al-Hamdan, adjunct professors, also in the department of epidemiology; Dr. Suzanne E. Judd, associate professor, and Dr. Leslie A. McClure, professor, in the department of biostatistics; Dr. Virginia G. Wadley, associate professor in the department of psychology; and Dr. Edmond K. Kabagambe, previously a professor in the department of epidemiology at UAB (currently at Vanderbilt University).