Abstract
Observers adapted to a field of randomly coloured twinkling tiles, in which was embedded a faint, subthreshold green letter. Observers failed to discern this letter, but they readily reported its pink afterimage afterwards. This demonstrates a storage of changing colours over time; adaptation occurs for the average of each retinal point.
Highlights
An afterimage is usually weaker than the stimulus that induces it, as well as being of opposite colour
Here we show that an invisible stimulus can give a visible afterimage
Most observers do not perceive any letter during the twinkling adapting phase, but afterwards they do see the pink afterimage of a capital letter
Summary
An afterimage is usually weaker than the stimulus that induces it, as well as being of opposite colour. The inducer was a faint, subthreshold green letter, masked by twinkling colour noise, and its afterimage was a strong, pink perceived letter. If you do not see an afterimage on your first try, please increase the fixation time.) You will see coloured, flickering tiles.
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