Abstract
When two flashes of light are delivered to the light-adapted eye at the same time and place, their combined increment threshold provides evidence about (a) integration or cancellation of energy within receptors, (b) physiological summation and inhibition of receptor outputs, and (c) probability summation. These relations are examined using high-energy positive and negative red flashes (630 nm) paired with positive flashes of other wavelengths. All of these phenomena are found to occur. A high degree of complex interaction among receptors is implied by the results.
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