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Motion detection circuit in fruit fly. A, Hassenstein–Reichardt elementary motion detection compares correlations in light intensity signals that are offset in space and time. B, Fruit fly. C, A light microscopic section through fruit fly optic lobe showing the first three stages of visual processing: lamina, medulla, and lobula plate. D, Electron microscopy reconstruction of a medulla column, different colors correspond to different neurons. C is adapted from Takemura et al. (2008).
