Abstract
We have fabricated and tested a set of electrode arrays for the study of information processing in the retina. Live retinal tissue is placed on top of an array with the output neurons directly above the electrodes. Absorption of light by the photoreceptor cells leads to the generation of electrical pulses in the output neurons. These pulses, in turn, produce voltage signals on the electrodes which are recorded simultaneously by external electronics. Thus, for the first time, the spatial and temporal firing patterns of a large set of retinal nerve cells can be studied. The arrays are fabricated on quartz wafers coated with a transparent conducting layer of indium tin oxide. The electrodes are electroplated with platinum black. Polyimide is used for insulation. The fabrication and properties of these arrays, and illustrative results with retinal tissue, are described.
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