Abstract
Special, striking neural connections in the optic ganglia of the compound eye of flies have been functionally interpreted by several authors. These functions proposed include colour vision, movement perception, pattern recognition and even vision of polarized light. A detailed study of the optical properties of the flies ommatidia and the “wiring diagram” of the first optic ganglion within the eye provide evidence that the special neural arrangement is not related to the functions mentioned above but is a means of increasing the light-gathering power in this type of compound eye by means of “neural superposition”.
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