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m →Cross-correlation for motion detection: Hassenstein–Reichardt model: clean up, replaced: Curr. Biol → Curr. Biol. using AWB |
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====Cross-correlation for motion detection: Hassenstein–Reichardt model====
A motion detector needs to satisfy three general requirements: pair-inputs, asymmetry and nonlinearity.<ref>Borst A, Egelhaaf M., 1989. Principles of visual motion detection. "Trends in Neuroscience" 12(8):297–306</ref> The cross-correlation operation implemented asymmetrically on the responses from a pair of photoreceptors satisfies these minimal criteria, and furthermore, predicts features which have been observed in the response of neurons of the lobula plate in bi-wing insects.<ref>{{cite journal | last1 = Joesch | first1 = M. | display-authors = 1 | last2 = et al | year = 2008 | title = Response properties of motion-sensitive visual interneurons in the lobula plate of Drosophila melanogaster | url = | journal = Curr. Biol. | volume = 18 | issue = | pages = 368–374 | doi=10.1016/j.cub.2008.02.022}}</ref>
The master equation for response is
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