Cover legend: The functional connections within a network of neurons reorganize following rhythmic stimulation. The cover shows a network of synaptic connectivity for simulated neurons overlaid on an image of cultured E18 rat cortical neurons. The simulated neurons are arranged in space according to a multidimensional scaling, and different communities of neurons in the network are labeled by color. (Courtesy of T. K. Ahuja, J. Tauskela, R. Monette, and G. A. R. Mealing, National Research Council of Canada.) For more information, see the article by Thivierge et al. in this issue (pages 7968–7978).