Optical and neural pooling in visual processing in crustacea

Abstract 1. 1. Optical pooling is common in crustacean vision, both pooling in the single ommatidium and pooling inputs from many ommatidia by overlapping visual fields. 2. 2. Optical and neural pooling work together subdividing the eye into different surface regions with different tasks. 3. 3. Small-fiber and large-fiber systems with corresponding small and large dendritic branching provide a parallel processing system. 4. 4. Several parallel, integrating channels process that visual information which is needed for high-speed reactions. 5. 5. Visual fibers receive contributions from other modality inputs like vibration, olfaction or attention neurons. Inputs from mechanoreceptors transmitted over integrating fibers seem to join the signals in the intergrating visual fibers. 6. 6. The signal for a particular channel is expressed by the pattern of spikes (rather than changes in the mean frequency of spikes) which is modulated by any input variation. 7. 7. A particular discharge pattern may then be recognized by a command neuron or a muscle ensemble.

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