Decay of visual information from a single letter.
If the trace of a letter can be matched more rapidly with a physically identical letter (as in the pair AA) than it can be with a letter having only the same name (as in the pair Aa), then the trace must preserve the visual aspect of the letter. The visual information from a single letter decays in about 1.5 seconds if the task provides little incentive for preservation.
D006801:Humans; D008297:Male; D008568:Memory; D011930:Reaction Time; D014787:Vision Tests; D014796:Visual Perception