Amplification of Trial-to-Trial Response Variability by Neurons in Visual Cortex
Figure 2
Relation between Response Variance and Mean for Three Cells
(A) Variance versus mean for firing rate of the simple cell in Figure 1 measured with 13 stimuli (the four in Figure 1 plus nine additional orientations). Line is linear regression. Diagonal line is prediction for a Poisson process.
(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 Vrest. Dotted line is firing threshold Vthresh.
(C) Variance versus mean for firing rate predicted by the rectification model. Details as in (A).
(D–F) As in (A–C) for a complex cell.
(G–I) As in (A–C) for a third neuron, whose behavior is intermediate between those of simple cells and complex cells.