Interactions between simultaneous contrast and coloured afterimages.

Coloured afterimages were obtained after fixation of a neutral grey spot on a coloured surround The colour of the spot afterimage was similar to that of the previous surrounding area. and was found to have two components which could be elicited independently. Firstly. complementary afterimages were generated by the subjective contrast colour which was induced into the grey spot during the adaptation period Secondly. the complementary afterimage of the surround at the end of the adaptation period was capable of inducing contrast colour into the neutral spot of the test field. Thus simultaneous contrast colours can produce afterimages (successive contrast). and conversely. coloured afterimages can induce simultaneous contrast colour.