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The cover illustration shows analysis of response variability in a colour-opponent parvocellular neuron in the lateral geniculate of the marmoset. Red dots represent the fundamental Fourier components of the response to individual 4 Hz cycles of chromatic modulation. The distance from the origin of each dot represents response amplitude; the direction from the origin represents response phase. The ellipses are contour lines of Gaussians fit to the response distribution. Blue dots represent a corresponding analysis in the absence of stimulation. See Victor et al. pp.29–51 .