The morphology of cSIFE. A, Only the dendrites that were completely visible in the confocal or fluorescence images have been reconstructed, except for the three dashed lines, which indicate presumed branches. The neuron was recorded and filled in the left lobula plate. Arrowheads 1–4 indicate two posterior dips of the main axon. Med, Medulla; LP, lobula plate; Prot, protocerebrum. B, Receptive field of cSIFE. The position of the steepest luminance decrement of a sinusoidal grating (100° wavelength, 5 Hz) is plotted on the x-axis (see Materials and Methods, N = 9).