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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Neurosci Res. 2013 Mar 28;76(3):101–105. doi: 10.1016/j.neures.2013.03.010

Figure 1.

Figure 1

A demonstration of a population response. A) The population consists of two cells. One cell prefers a 45 deg orientation, while the other prefers a 90 deg orientation. The tuning functions are modeled with a Von Mises function. B) The population response represents a single point on a plane. The dashed ellipse shows the set of points as orientation varies, in the absence of variability. The black dots show how the responses deviate from the ellipse in the presence of Poisson variability. Orientation was varied in 5 deg steps. The upward and downward arrows point to the responses when the orientation was 45 deg and 90 deg, respectively. These points correspond to the right-hand and top corners of the dashed ellipse. C) The two orientations, 45 deg (open dots) and 90 deg (filled dots), were repeated 100 times each. The variability of the responses makes the points scatter around the corresponding point on the dashed ellipse. The diagonal line shows the fitted boundary between the two clouds of dots. Linear discriminant analysis was used for the fit.