THE LOCUS OF VISUAL AFTER-IMAGES

K olehmainen , K. & T uomisaari , R. The locus of visual after-images. Scand. J. Psychol ., 1969, 10 , 45–48.—Three bright spots of light aligned horizontally were presented, so that the distances between them were equal. Two adjacent lights were flashed on simultaneously and the third one somewhat later. The subjects reported the distance between the midmost light and the light which appeared later to be longer than the distance between the simultaneous lights (the 'tau-effect'). As to the after-images, however, the intervening distances were judged equal. The results are, accordingly, suggestive of a peripheral basis of the after-images.