For example in vision, each hemisphere gets half of input from each eye.
Where did you get that idea? A quick googling gives me http://changingminds.org/explanations/brain/parts_brain/left_right_brain.htm:
The halves are neither mirror images nor contain completely exclusive functions. However there are significant similarities. Each half receive sensory information though, curiously, from the opposite side of the body. Thus the right eye goes to the left brain and vice versa. The exception is the nose: the right nostril goes to the right brain.
Skeptics question : http://skeptics.stackexchange.com/questions/32988/does-the-right-eye-feed-information-to-the-left-brain-hemisphere-while-the-left
If you look e.g. at the start of the Wikipedia article on the visual cortex you will find:
the left hemisphere visual cortex receives signals from the right visual field, and the right visual cortex from the left visual field.
Or take a look at this diagram from a book about the visual field. Or this online book.
I thought this was very widely known -- which I say not in order to make you feel bad (there's no shame in not knowing things) but to suggest why Viliam didn't find it necessary to provide references when he said that each hemisphere gets input f...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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