FIGURE 5.

Effect of σ_v on the acceleration sensitivity of the H1-cell. (A) The fitted values of β for the proportional controller with gain K_p are plotted against the standard deviation of the velocity distribution, σ_v. Increasing σ_v linearly decreases β as per the relationship specified by the regression line. (B) The input–output functions for three different values of β (normalized by the peak spike rate, F) show that (C) decreasing beta linearly decreases the gradient at the point σ_v = 0 deg/s (D) and this decrease is linear. This reduction in gradient of the H1-cell input–output function represents a decrease in sensitivity to changes in the image velocity i.e., a decrease in sensitivity to image acceleration. The results show that increasing σ_v directly decreases the sensitivity of the H1-cell to image accelerations.