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. Author manuscript; available in PMC: 2008 May 15.
Published in final edited form as: J Neurosci Methods. 2007 Jan 16;162(1-2):171–179. doi: 10.1016/j.jneumeth.2007.01.005

Figure 1.

Figure 1

The sliding window method shows movement of a single fly. The four images on the top row (a–d) represent a single fly in a shallow dish at four consecutive time points. Digitally subtracting (a) from (b) yields (e) and digitally subtracting (c) from (d) yields (f). The background disappears and white files on a black background show that movement took place. Digitally subtracting (e) from (f) gives (g), an image where the four white flies represent the fact that two movements occurred during the interval measured (the maximum possible).