Figure 3.

The prediction of the fly's steering response to a sinusoidal stimulus matches observed responses. A prediction was obtained by convolving the estimated filter with the stimulus velocity signal (see inset). A, B, In yaw, the prediction captures a previously observed increase in steering amplitude in response to odor (A), and in sideslip, the prediction also matches a previously observed, but smaller, decrease in steering amplitude (B). However, the filters are not able to replicate the observed high-frequency cutoff (near middle of stimulus). Plotting a random sample of the predicted response against the real data reveals the linearity of the phase relation between the two traces. C, Odor improves the phase correlation for the yaw prediction as measured by Pearson's correlation coefficient, r, to a linear fit. D, However, the phase correlation of the sideslip response is already largely independent of olfactory context.