Abstract
Choline, tetramethylammonium chloride (TMA), and sucrose were used as sodium replacements in testing the effect of sodium replacement on the components contributing to the electroretinogram (ERG) recorded from the ocellus of the cockroach Blaberus craniifer. Several components have been shown to contribute to the ocellar ERG ( Ruck, 1961, 1966). Components assigned to sites of origin in the retinula cell axons and ocellar nerve fibres are abolished when the sodium is replaced by any of the test solutions. The effect on the generator potential differs, being reduced in magnitude when testing choline or TMA, but with only small decreases in magnitude when testing sucrose. This indicates that different mechanisms must be responsible for producing the components contributing to the ocellar ERG.
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