De-Motivational

[Angrboda]

If you look closely, you can see the minor dark patches that make up the letters. An interesting fact about vision is that some of the processing for lines and boundaries occurs in the retina itself. The receptors in the eye are wired such that if a dark receptor is next to a lit receptor, nerve impulses between the two receptors amplify that difference so that the dark and light next to each other appear comparatively more contrasting. Thus the areas where light and dark meet, the definition of that edge, is amplified in the retina before it even leaves the eye. If I had to guess, I'd say that effect lies behind this effect, as moving the image on the retina likely prevents that inter-receptor feedback from working as robustly as it likely does if the image is relatively still. Thus, the normal in retina processing makes the whites whiter and the blacks blacker when still, thus obscuring the subtle changes in intensity, but when you move the image rapidly, because it's quickly moving from location to location, the amplifying effect of the retina is not as robust, and the subtle changes in tone become visible.