White matter structure and myelin-related gene expression alterations with experience in adult rats by Sampaio-Baptista, C, Vallès, A, Khrapitchev, AA, Akkermans, G, Winkler, AM, Foxley, S, Sibson, NR, Roberts, M, Miller, K, Diamond, ME, Martens, GJM, De Weerd, P, Johansen-Berg, H