FIGURE 6.

H1 and HSE receptive fields and horizontal network connections. (A) Top row shows monocular and binocular receptive fields of the H1 and the HSE LPTCs, respectively. The insets show the dendritic arborization patterns of both cells in the left lobula plate as well as the HSN LPTC in the right lobula plate. The dendritic input arbourizations and the telo-dendritic output arborizations of the H1 cell are connected via a thin axon that transmits visual motion information from the left to the right lobula plate using action potentials. The HSE and the HSN cells arborize in the equatorial and the north sections of the lobula plate, respectively (modified from Krapp et al., 2001). (B) The connectivity in the network of LPTCs sensitive to horizontal motion. Excitatory and inhibitory interactions are depicted with open triangles and filled circles, respectively. The HSE and HSN cells receive excitatory input from the contralateral H1 and H2 cells and project onto descending neurons which in turn supply the neck and flight motor systems of the fly (modified from Krapp et al., 2001).