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Cover: Maps of spatial frequency preference in the cat primary visual. The eight panels surrounding the central panel are single-orientation spatial frequency maps constructed from the orientation shown on the panel. Spatial frequency preference is color-coded such that red pixels responded preferentially to low-frequency sinusoidal grating, yellow and green pixels preferred intermediate frequencies, and blue and purple pixels preferred high frequencies. The central panel was constructed by color-coding each pixel according to the spatial frequency of the stimulus that most effectively drove the neurons at that pixel. The brightness of a pixel corresponds to the strength of the response of the pixel. For details, see the article by Issa et al. in this issue (pages 8504-8514).