Figure 3From: Application of the SP theory of intelligence to the understanding of natural vision and the development of computer visionTwo sets of recordings from a single ommatidium of Limulus (Ratliff and Hartline 1959, p. 1248). Reproduced from Figure 4, The Journal of General Physiology, 42, p. 1248, by copyright permission of The Rockefeller University Press.Back to article page