Lars Nyberg and Rolf Adolfsson, PI (http://www.betula.su.se/en/index.html)
In this project, a sample of 3,500 persons aged 35-80 years living in Umeå, Northern Sweden, has been assessed every fifth year since 1988 with regard to multiple cognitive, biological, and social variables. New cohorts have been included at each wave to estimate the size of test-retest effects. A total of about 4700 persons have been assessed. A sixth wave will take place in 2013-2015.