That story as it’s commonly told is probably not correct. Everything about the blast and the hole in his head is true, but the drastic personality changes are probably incorrect.

Malcolm MacMillan wrote a masterpiece on what we actually know about the life of Gage, and it’s far from the angry impulsive man we hear about in textbooks.

https://mitpress.mit.edu/9780262632591/an-odd-kind-of-fame/