I have heard stories about people acquiring skills after being hit in the head, here is one of them. In this particular story the man was assaulted and knocked unconscious and after he awoke he could see lines emanating from some objects. My understanding of the story is that to understand these lines he rigorously studied math. I found some parts of the story misleading as it implied the blow to the head is what caused his heightened mathematically ability.
Have there been any studies done to prove or disprove that people can actually learn something or acquire a new skill or improve upon knowledge they already know by receiving a blow to the head?
I'm not asking about cases where someone concisely decides to make an effort to learn something after a harrowing experience.