Fig. 11.

Effects of body temperature on the DCMD response to looming stimuli. Top inset, Two extracellular action potentials recorded at room temperature (21°C, trace i) and at 30°C (trace ii). Note the significant decrease (43%) in the width of trace ii compared with i (measured as the time difference between the arrows shown on the inset). Main panel, Time of peak firing relative to collision as a function of l/‖v‖ at room temperature (squares), 30°C (circles), and during a subsequent control experiment back at room temperature (triangles). For clarity, only the largest error bar is shown at each value of l/‖v‖. Note the increased variability in the peak response compared with Figure 7 or 9, for example. This was presumably because of the longer time span of the experiment (2 h 30 min in this case) caused by heating and cooling of the animal. Solid lines, Best linear fits to the data using Equation 5. Bottom inset, Values of the parameters α and δ for each of the three fits ± SD showing no significant differences in the mean values. Data are from a single experiment.