Are there any forms of brain damage that would leave someone with severe memory loss, unable to speak, or at least do so intelligibly, and with trouble moving around, but still able to understand speech and capable of literacy? If not then the priority of traits are as follows; Inability to speak and severe memory loss. Able to understand speech. Trouble moving around (is actually very important to the plot but I can come up with another reason if necessary). Capable of literacy. In the interest of full disclosure and avoiding confusion I should mention that there's a lot of sci-fi stuff in play (long story short, a character suffered severe brain damage, far more severe than what would be necessary to cause the above, and someone else tried to fix it but didn't manage to fix everything) so things probably don't actually need to be completely realistic. That said, I want to try to keep things at least in sight of realism, if only the minimise the amount of handwaving I'd have to do. Also, what would be other symptoms that it'd make sense for someone with an imperfectly repaired brain to have? I'm aiming for the character in question having a level of functionality that's high enough for them to look after themselves and mostly function independently (emphasis on "mostly") but low enough for those who used them as a human guinea pig under ethically dubious circumstances to regard them as a failure.