Figure 6.

Similarity of neuronal responses in different states of octopaminergic modulation evaluated with another naturalistic optic flow sequence. (A) Averaged responses of ipsilateral V1 neurons (N = 9) before drug application, after CDM application, and after subsequent epinastine application (top) and self-motion parameters of the fly's head (middle and bottom). Data presentation and color coding as in Figure 1. (B) Time-delayed cross-correlations calculated between different states of octopaminergic modulation and comparison with cross-correlations for responses recorded in the same state. Left, cross-correlation calculated between the responses of the control condition and following CDM application (gray), and between the responses after CDM and subsequent epinastine administration (black). Average across all flies for the ipsilateral V1 is shown. Inset shows a magnification of the correlation peak to illustrate the time shift. Right: time shift summarized for all recorded flies as determined from the cross-correlations. (C) Comparison of the maximum values reached by the peaks of the cross-correlograms. See legend of Figure 4 for explanations. The asterisks represent statistical significance at the 5% significance level (Wilcoxon signed rank test, N = 9).