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To better understand and treat the diseases that cause dementia, researchers rely on data provided by health study volunteers who, year on year, undergo a variety of tests. As part of joining Great Minds our members, who come from previous health studies, are asked to complete online- or smartphone-based cognitive tasks. In her blog, Leona Wolters – Research Assistant on Great Minds – describes what cognition is and how cognitive assessments help researchers find the right people for the right trials.