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. Author manuscript; available in PMC: 2013 Jul 11.
Published in final edited form as: Neuroscience. 2012 Aug 4;223:124–130. doi: 10.1016/j.neuroscience.2012.07.065

Figure 1.

Figure 1

A top and side view of the optokinetic testing apparatus. The animal is enclosed in a central chamber which is suspended within a larger rotating drum. The drum contains high contrast stripes of varying widths (see Table 1) that when viewed from the calculated central distance correspond to a particular spatial frequency. Throughout testing different widths of stripes are used to determine visual acuity. The gray in the bottom panel represents a cut away portion of the outer drum so that the inner chamber can be seen. The opossum is not to scale.