I have a relative with that. It comes with personality traits as well as physical traits, including black-and-white thinking (no nuance or middle ground), difficulty learning. Many end up in jail. Physically, they have a certain walk and posture, little facial hair, and they are sterile. It’s a tough life sentence for little boys to grow up with.
I know someone who has this (his wife told me about it).
He was sterile and definitely a little more violent than expected, and had some psychological issues (looking back).
Very sad.
The symptoms sound like Aspergers + Fetal Alcohol Syndrome.
That would equal a very tough life, even under the best of circumstances, where they receive early treatment.
A thousand years ago in Portugal it would seem to be an advantage. medieval times were noted for men who were short tempered, violent and thought in black and white terms. Would make for a loyal retainer or a good crusader.