FIGURE 9-28 Activity at the Margins Responses of a hypothetical population of on-center ganglion cells whose receptive fields (A–E) are distributed across a light–dark edge. The activity of the cells along the edge is most affected relative to those away from the edge.

Information from D. Purves, G. J. Augustine, D. Fitzpatrick, L. C. Katz, A.-S. LaMantia, & J. O. McNamara (Eds.). (1997). Neuroscience, (1st ed., p. 195). Sunderland, MA: Sinauer.