Fig. 5. Responses to contrast ramp stimulus at a range of temporal (TF) and spatial frequencies (SF) in the frontal portion of the receptive field of a single male HSN neuron. The mean response to 3 or more trials is shown in black for each combination of spatial and temporal frequency as plotted as in Fig. 3C. Parameter fits are shown in red. The data are plotted on logarithmic contrast axis. Minimum of 3 trials per trace; azimuth=0°, elevation=60°. Details of fitting described in Materials and methods. Decade C, tenfold Michelson contrast variation.