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Voss, M.W., Erickson, K.I., Chaddock,L., Prakash, R.S., Colcombe, S.J., Morris, K.S., Doerksen, S., Hu, L., McAuley, E. & Kramer, A.F. (2008). Dedifferentiation in the visual cortex: An fMRI investigation of individual differences in older adults. Brain Research, 1244(9), 121-131.