The perception of luminosity is thought to depend upon the intensity of the stimulus: a surface begins to appear self-luminous when it emits or reflects a certain amount of light. This is known as the luminosity threshold. It is a common opinion among vision scientists that such a threshold is correlated to the intensity of a perceptually white surface, in the sense that only an area of the visual field with luminance higher than perceived surface-white will appear lumi- nous. Here we show grey colours that appear luminous in virtue of surrounding luminance ramps. These ramps are intended to mimic halos seen around light sources in natural environ- ments. The results of three experiments indicate that the phenomenon is in direct contradiction to the aforementioned assumptions and suggest the existence of separate perceptual pathways for self-luminosity perception and for surface-colour perception.
|Citazione:||Zavagno, D., & Caputo, G. (2005). Glowing grays and surface white: the photo-geometric factors of luminosity perception. PERCEPTION, 34, 261-274.|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Titolo:||Glowing grays and surface white: the photo-geometric factors of luminosity perception|
|Autori:||Zavagno, D; Caputo, G|
|Data di pubblicazione:||2005|
|Appare nelle tipologie:||01 - Articolo su rivista|