Formalism for the neural network of visual systems

Pseudopupils of Compound Eyes

“…Neuroommatida having j = 2, 1, 0 (or -1, -2, -3) receive axons from the opposite half of the eye. The appearance of the different stages as drawn in the figure is not unlike the reduced corneal pseudopupil phenomenon observable near the equator (see KIRSCHFELD, 1967); from STAVENGA and BEERSMA (1975) BRAITENBERG, 1967) of retinular cell axons into one and the same neuro-ommatidium. The other half consists of the proof that the corresponding retinular cells have one and the same visual axis.…”

“…The corresponding H-V axes (Fig. 3), forming an orthogonal (curvilinear) coordinate system, introduced for the crab by WATERMAN and HORCH (1966), has been extended by STAVENGA (1975a, b) and STAVENGA and BEERSMA (1975) (see below). TRUJILLO-CENOZ and BERNARD, 1972) Oblique rows of facets have been assigned axes by BRAITENBERG (1967BRAITENBERG ( , 1970, namely x-and yaxes; his z-axis is identical to the H-axis.…”

“…Comparison with Fig.6 shows that a retinular cell axon with index pair (i*,j*) from an ommatidium having the identical index pair (i*,j*) projects into the neuro-ommatidium with (i*,j*) = (0,0). The corresponding ommatidium has been omitted from the diagram (from STAVENGA and BEERSMA, 1975) of six individual ommatidia, which are connected synaptically to second order neurons. The axons of the second order neurons run parallel with those of the two central retinular cells, R 7 and R 8 of one ommatidium, to a specific column in the medulla.…”

The neural superposition eye and its optical demands

“…Stavenga and Beersma, 1975). For the present we conclude that the introduced lattice description has shown its usefulness in the study of the visual system of an important insect species.…”

“…As a corollary of the lattice approach we developed an index notation scheme, of which some applications have been described elsewhere (Stavenga, 1975;Stavenga and Beersma, 1975). ttere we will restrict ourselves to the lattice structure of the neural superposition eye.…”