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Cover picture: Schematic illustration of an experiment investigating spatial summation in the middle temporal area of macaque extrastriate cortex. The Gaussian surface in the top panel depicts the sensitivity profile of the receptive field (RF) of a single MT (or equivalently, V5) cell, on which is shown two Gabor function stimuli in different locations in the RF. The bottom shows the results of many such pairwise combinations of stimuli, where the x- and y-axes show the responses to single stimuli, and the z-axis shows the observed response to the pair. The mesh surface through the data points is the best fit nonlinear summation model describing data. The surface clearly curves inward, revealing a systematic departure from linear summation. For details, see the article by Britten and Hever, in this issue (pages 5074-5084).