Color varies in energy flow per unit area {intensity, vision}. Vision can detect very low intensity. People can see over ten-thousand-fold light intensity range. Vision is painful at high intensity.
sensitivity
People can perceive one-percent intensity differences. Sensitivity improves in dim light when using both eyes.
receptors
Not stimulating long-wavelength or middle-wavelength receptor reduces brightness. For example, extreme violets are less bright than other colors.
temporal integration
If light has constant intensity for less than 100 ms, brain perceives it as becoming less bright. If light has constant intensity for 100 ms to 300 ms, brain perceives it as becoming brighter. If light has constant intensity for longer than 300 ms, brain perceives it as maintaining same brightness.
unchanging image
After people view unchanging images for two or three seconds, image fades and becomes dark gray or black. If object contains sharp boundaries between highly contrasting areas, object reappears intermittently.
bleaching
Eyes blinded by bright light recover in 30 minutes, as eye chemicals become unbleached.
Consciousness>Consciousness>Sense>Vision>Physiology>Intensity
1-Consciousness-Sense-Vision-Physiology-Intensity
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224