Receptive fields of the simulated tangential cells.

For each cell-type the receptive field center (,), the receptive field width (,) as well as the preferred (PD) and null direction (ND) is specified. See equation for the formal description of a receptive field. Note that only the values of the lobula plate cells in the left hemisphere are listed. All numbers are given in degree of visual space. Negative x-values (azimuth) refer to the left side, positive ones to the right side of the animal. Negative y-values (elevation) are below the horizon, positive ones above the horizon. Preferred direction and null direction is given in four cardinal directions: dn = downward, up = upward, ftb = front-to-back, btf = back-to-front. If no values are indicated (V1, Vi, Vi2, dCH and vCH), the corresponding cells do not receive direct input from local motion detectors.