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Sensation and Perception: Ramachandran 1992
Ramachandran, V.S. (1992). Blind spots. Scientific American, 266(5), 86-91.
The place where the optic nerve attaches to the eyeball is not sensitive to light. Therefore, in each eye, there is a space in vision where the eye does not actually see. The brain, not being fond of leaving holes in vision, fills in this spot with whatever is around it (or, if both eyes are open, with data from the other eye).

This demonstration allows participants to see where their blindspot is and some basic types of filling-in that the eye does to compensate for that. Low-level patterns like lines, for instance, are completed, whereas high-level patterns, such as evenly spaced circles, are not.

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Brian MacWhinney