Editing Talk:2120: Brain Hemispheres
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If the left side controls the top half of the body, wouldn't that mean it also controls the right half? [[Special:Contributions/108.162.241.248|108.162.241.248]] 20:04, 6 March 2019 (UTC) | If the left side controls the top half of the body, wouldn't that mean it also controls the right half? [[Special:Contributions/108.162.241.248|108.162.241.248]] 20:04, 6 March 2019 (UTC) | ||
: It is uncontroversial that many senses and motoric functions are swapped between the right and left side. The anatomy of the nerve swaps can also be shown. But it is still under discussion, why evolution led to this swap (source: [https://en.wikipedia.org/wiki/Contralateral_brain Contralateral brain] and the even better organized German version [https://de.wikipedia.org/wiki/Kontralateralit%C3%A4t_des_Vorderhirns Kontralateralität des Vorderhirns]) Sebastian --[[Special:Contributions/172.68.110.46|172.68.110.46]] 08:41, 7 March 2019 (UTC) | : It is uncontroversial that many senses and motoric functions are swapped between the right and left side. The anatomy of the nerve swaps can also be shown. But it is still under discussion, why evolution led to this swap (source: [https://en.wikipedia.org/wiki/Contralateral_brain Contralateral brain] and the even better organized German version [https://de.wikipedia.org/wiki/Kontralateralit%C3%A4t_des_Vorderhirns Kontralateralität des Vorderhirns]) Sebastian --[[Special:Contributions/172.68.110.46|172.68.110.46]] 08:41, 7 March 2019 (UTC) | ||
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: With regard to the retina, the right half of the brain processes what the right half of each retina receives, and the left half processes what the left half of each retina receives (see e.g. [https://nba.uth.tmc.edu/neuroscience/m/s2/chapter15.html optic nerve]), but because our retina is behind the focal point of our lens so all the lightbeams cross and images hit the back of the eyeball upside-down and backwards, that means the halves of our brain process the opposite halves of what we see. But it's the same side of our body! I stopped learning neuroscience after we got to the optic nerve ;p [[Special:Contributions/108.162.221.95|108.162.221.95]] 21:48, 6 March 2019 (UTC) | : With regard to the retina, the right half of the brain processes what the right half of each retina receives, and the left half processes what the left half of each retina receives (see e.g. [https://nba.uth.tmc.edu/neuroscience/m/s2/chapter15.html optic nerve]), but because our retina is behind the focal point of our lens so all the lightbeams cross and images hit the back of the eyeball upside-down and backwards, that means the halves of our brain process the opposite halves of what we see. But it's the same side of our body! I stopped learning neuroscience after we got to the optic nerve ;p [[Special:Contributions/108.162.221.95|108.162.221.95]] 21:48, 6 March 2019 (UTC) | ||
: You must've stopped in the middle of the lesson, because the optic nerves split so that both brain halves get a copy of each eye. Your own link points it out in the figure as the "Optic chiasm".--[[User:Henke37|Henke37]] ([[User talk:Henke37|talk]]) 13:09, 7 March 2019 (UTC) | : You must've stopped in the middle of the lesson, because the optic nerves split so that both brain halves get a copy of each eye. Your own link points it out in the figure as the "Optic chiasm".--[[User:Henke37|Henke37]] ([[User talk:Henke37|talk]]) 13:09, 7 March 2019 (UTC) | ||
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:I think the "right side of your brain controls the left side of your body" is NOT accurate, it's just closer to truth than the reverse. Some parts of perception and motor control are divided that way, but unless you have corpus callosotomy the high-level control is centralized and/or distributed regardless the side. Would be hard to synchronize both hands if not. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 02:05, 7 March 2019 (UTC) | :I think the "right side of your brain controls the left side of your body" is NOT accurate, it's just closer to truth than the reverse. Some parts of perception and motor control are divided that way, but unless you have corpus callosotomy the high-level control is centralized and/or distributed regardless the side. Would be hard to synchronize both hands if not. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 02:05, 7 March 2019 (UTC) | ||
Having survived an ischemic stroke on the left side of my brain, which temporarily paralyzed the right side of my body, this comic speaks to me like none other. | Having survived an ischemic stroke on the left side of my brain, which temporarily paralyzed the right side of my body, this comic speaks to me like none other. | ||
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