Fig. 9. DCMD responses to 17 consecutive approaches of a `locust' (black rasters) or `bird' (red rasters) at 4 s intervals. Approach 16 is a new object [`bird' following `locust' (red arrow) or `locust' following `bird' (black arrow)] approaching along the same trajectory. All data plotted as in Fig. 7. (A) The habituated right DCMD responded more strongly to a `bird' (red arrow) than to a `locust' (black arrow) approaching from +45° azimuth. (Bi) The peak spike rate, (Bii) the spike rate 200 ms before collision and (Biii) the number of spikes increased only when the DCMD was presented with a new larger object (note approach 16, N=11). For clarity the S.D. is shown in only one direction.