Relation between Response Variance and Mean for Three Cells

<div><p>(A) Variance versus mean for firing rate of the simple cell in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0020264#pbio-0020264-g001" target="_blank">Figure 1</a> measured with 13 stimuli (the four in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0020264#pbio-0020264-g001" target="_blank">Figure 1</a> plus nine additional orientations). Line is linear regression. Diagonal line is prediction for a Poisson process.</p> <p>(B) Variance versus mean for coarse potential. Error bars are 2 s.d. Curve is linear fit to standard deviation versus mean. Dashed line is resting potential <i>V_rest.</i> Dotted line is firing threshold <i>V_thresh.</i></p> <p>(C) Variance versus mean for firing rate predicted by the rectification model. Details as in (A).</p> <p>(D–F) As in (A–C) for a complex cell.</p> <p>(G–I) As in (A–C) for a third neuron, whose behavior is intermediate between those of simple cells and complex cells.</p>