A surprising property of electrical spread in the network of rods in the turtle's retina

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Abstract
Flashing a localized stimulus onto a turtle [Pseudemys scripta elegans and Chelydra serpentina] retina produced an intracellular potential wave which spread through electrical connections from illuminated to unilluminated photoreceptors. The response in unilluminated rods (but not in cones) became faster as the distance from the source increased, perhaps because voltage-dependent permeability changes in the rod membrane make the coupled network behave like a high-pass filter.