Table 1. Different types of filling-in, sorted according to their speed of occurrence and stimulus dependency (after Spillmann & de Weerd, 2003 and Weil & Rees, 2011).

Stimulus dependent	Stimulus independent
Fast
Illusory contours	Filling-in at blind spot
Neon-colour spreading	Filling-in of retinal scotoma
Watercolour effect
Retinal afterimages
Slow
Troxler fading	Stabilised retinal images
Contour erasure	Scene fading with blurred images
Figure–ground texture segregation
Note. The forms of filling-in we address in this report are highlighted in bold font.