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Viliam comments on Open Thread May 9 - May 15 2016 - Less Wrong Discussion

3 Post author: Elo 09 May 2016 01:55AM

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Comment author: ChristianKl 19 May 2016 02:50:42PM 0 points [-]

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

Comment author: Viliam 19 May 2016 02:59:28PM *  0 points [-]

I can't quickly find a source for each hemisphere receiving only a part of the visual field, but the optical nerves coming from each eye cross before reaching the brain, so it's not "one eye, one hemisphere". (That doesn't mean "the left one goes right and vice versa", but "they join, and then they split again".)

https://en.wikipedia.org/wiki/Optic_nerve

Comment author: ChristianKl 19 May 2016 03:09:00PM 0 points [-]

I can't quickly find a source for each hemisphere receiving only a part of the visual field, but the optical nerves coming from each eye cross before reaching the brain

The nerves cross in the ChangingMind descriptions. That's how the left eye surplies the right hemisphere and vice versa. I don't see how they join in the sense of sharing information while the cross.