Bonnehs Illusion




HOW IT WORKS: Stare at a yellow dot in the animation. Eventually, one or two of the other yellow dots will disappear. This illusion supposedly proves Professor Jack Pelligrews theory that the brain is continually switching between the right and left hemispheres. The theory of brain switching came about when Professor Pettigrew attempted to explain the odd optical behaviour of a fish known as the Sandlance. The Sandlances eyes are disconnected from each others motion and unlike most animals, its eyes can move independently of each other. Its eyes do not move simultaneously, only one eye moves at a time. Professor Pettigrew theorised the reason for this sequential motion is that each eye is connected to only one hemisphere of the brain, right eye to the right hemisphere, left eye to the left hemisphere and when the brain switching occurs only one side of the brain at any one time has full control of the brain and hence body. In this case the side being switched to. This also means that the eye connected to the side being switched to has the ability to or right of way to send signals to the necessary muscles in order for it to move.



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