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

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Summary

Introduction

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.

Results
Conclusion
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