Cover legend: The image portrays the timing of discriminating activity during perceptual decision-making. The discriminating components, identified by single-trial analysis of electroencephalograms (EEGs), were used to develop a timing diagram. The components correlated with visual perception (170 ms), decision difficulty (220 ms), and decision-making (300 ms), as indicated by color-coded scalp projections of the EEG activity. For details, see the article by Philiastides et al. (pages 8965–8975). Cover art by Mimi Duvall and John-Paul Layedra.