To see an object change, it is necessary to attend to it.
To show this, we developed a flicker paradigm in which an original and a modified image continually alternate, one after the other, with a brief blank field between the two (see Figure 1 below). The onset of each blank field swamps the local motion signals caused by a change, short-circuiting the automatic system that normally draws attention to its location. Without automatic control, attention is controlled entirely by slower, higher-level mechanisms which search the scene, object by object, until attention lands upon the object that is changing. The change blindness induced under these conditions is a form of invisibility: it can become very difficult to see a change that is obvious once attended.
Be sure to go to this website and see how long it takes you to notice what's changing in the picture. I think it will surprise you.
See more examples here and check out the Change Detection Database. Even when I know something is changing in these images, it takes me a while to see it. It makes me wonder how long it would take if I didn't realize it?
P.S. -- If you found this interesting, you'll probably like this too.
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