Neural mechanisms in early visual information processing

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We examined the visual information processing in the retina. Bipolar cells, the second order neurons, were electrically coupled with each other through gap junctions at their dendrites. At the axon terminal these cells received reciprocal inhibitory inputs and wide-field lateral inhibitory inputs from amacrine cells. Both inputs were GABAergic but their synaptic properties were different. Excitation of electrically-coupled multiple bipolar cells was essential for the activation of lateral inhibition.