Eigengrau
Sign in to savethumb|Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Crumey (2014). The flat curves at low light indicate Eigengrau. thumb|An example of noise observed in the dark thumb|Another example of noise observed in the dark Eigengrau (German for 'intrinsic gray'; ), also called Eigenlicht (Dutch and German for 'intrinsic light'), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of visible light.
Article
4 sectionsContents
- Background
- Cause
- See also
- References
thumb|Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Crumey (2014). The flat curves at low light indicate Eigengrau. thumb|An example of noise observed in the dark thumb|Another example of noise observed in the dark Eigengrau (German for 'intrinsic gray'; ), also called Eigenlicht (Dutch and German for 'intrinsic light'), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of visible light.
==Background== The term Eigenlicht dates back to the nineteenth century, and has rarely been used in recent scientific publications. Common scientific terms for the phenomenon include "visual noise" or "background adaptation". These terms arise due to the perception of an ever-changing field of tiny black and white dots seen in the phenomenon.