system
Given the following post, respond as if you're commenting on Reddit:
human
[DBZ] When Goku bonked his head, did he remove Saiyan programming, or did he receive brain damage that altered his personality?
gpt
A little bit of both.  Goku thoughout his life still has a couple of Saiyan personality traits that are fundamental to him - always seeking out a tough fight, a certain level of arrogance, etc.  

The knock on the head did cause enough brain damage for him to forget his mission and the aggression that he'd been programmed with.  Presumably, since he was being taken care of by Grandpa Gohan, when he woke up, the old man's kindness was what imprinted on him and led to the personality that we know today.  Fundamentally innocent and human, but with an edge from his Saiyan biology.