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It is beneficial for the brain to be connected to the contralateral side of the body because of the position and connection to the brain that our eyes have. Since light from the right visual field strikes the left side of the eye and light from the left side strikes the right side of the eye, the connections (each eye predominantly connects to the same side of the brain though there are connections to both sides and information is transferred at the optic chiasm) allow visual information from the opposite side (both sides, but opposite is important for the answer) of the body to reach the brain. Being able to respond to information on the side of the body that the given hemisphere of the brain controls is key to an animals survival.

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12y ago

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