Fig. 6. Assessment of whether DCMD habituation was the same for repeated presentations of a `locust' (black bars) and `bird' (open bars). The value of the 30th (habituated) approach was normalized to the first approach. Values are means ± S.D. A two-way ANOVA revealed that the object size or trajectory did not affect the peak spike rate. A `locust' approaching from 0° azimuth resulted in a greater decrease of the instantaneous spike rate 200 ms before collision than did a `bird' from the same trajectory or a `locust' approaching from ±45° azimuth (see text for statistical parameters; bars with the same letters were not statistically different, N=9). Comparisons were made within each graph.