After his corpus callosum was severed to treat a seizure disorder,Phineas Gage experienced a progressive decline in personality and emotional stability.

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Phineas Gage did not have his corpus callosum severed; he suffered a traumatic brain injury when an iron rod penetrated his skull and brain. His case is famous for its effects on his personality and emotional stability, but it did not involve a surgical procedure on the corpus callosum. The corpus callosum is a structure that connects the two hemispheres of the brain, and severing it is a different procedure known as a corpus callosotomy, used to treat seizures in some cases.

After His Corpus Callosum Was Severed to Treat a Seizure