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Split brain phenomenon in medical aspect:
As it is known, corpus callosum connects the two hemispheres of the brain. Each hemisphere controls the muscles on the other side of the body.
For example: the left side of each retina sees the right side of the world and is then routed to the left hemisphere. The right side of each retina sees the left side of the world and then goes to the right hemisphere.
About 95% of us have our left hemisphere controlling our ability to speak, while our right is mute.
Though controlling the muscles of the other side of te body, the two hemispheres could easily communicate and coordinate if the corpus callosum is intact.
But without an intact corpus callosum (injured or severed), there comes a problem in the communication between the two hemispheres- resulting to split brain phenomenon.
For example: Your friend may see a flower to his left (with the image being sent to his right hemisphere) and not be able to tell what it is.
(Remember that the right hemisphere is always mute and now lacks any connection with left hemisphere so it stops right there on the right side and couldn't say anything.)
Your split-brain friend may say, “I don't know what is that”, but while saying that, he would be grasping a flower on his left hand!
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