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Cover image
Cover legend: Populations of ON (red) and OFF (blue) parasol retinal ganglion cells firing synchronously in response to visual stimulation. Each frame represents the simultaneous firing pattern of all retinal ganglion cells of the same cell type within 10 ms. For more information, see the article by Shlens et al. in the August 9, 2006 issue (Vol 26, Issue 32, pages 8254–8266).