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1Lumosity website homepage, www.lumosity.com/.
2Nintendo’s Brain Age website homepage, www.brainage.com/launch/index.jsp.
3R. Brookmeyer, E. Johnson, K. Ziegler-Graham, MH Arrighi, “Forecasting the Global Burden of Alzheimer’s Disease,” Alzheimer’s and Dementia 3, no. 3 (July 2007): 186–91.
4Timothy Salthouse, “When Does Age-Related Cognitive Decline Begin?” Neurobiology of Aging 30, no. 4 (April 2009): 507–14.
5Howard Hughes Medical Institute, “Alzheimer’s Disease Is Not Accelerated Aging,” 30 September 2004, www.hhmi.org/news/buckner4.html.
6Randy L. Buckner, “Memory and Executive Function in Aging and AD: Multiple Factors that Cause Decline and Reserve Factors that Compensate,” Neuron 44 (30 September 2004): 204.
7Howard Hughes Medical Institute, “Alzheimer’s May Leave Some Forms of Memory Intact,” 10 June 2004, www.hhmi.org/news/buckner3.html. See also Cindy Lustig and Randy L. Buckner, “Preserved Neural Correlates of Priming in Old Age and Dementia,” Neuron 42 (10 June 2004): 865–75.