Sort of relatedly I once had professor who was deaf, but she had learned to read lips and speak so she could communicate easily with hearing people who didn’t know sign language. One day she had gotten off topic and was talking a little about her personal life, so that one of the students said “Oh, I know, I grew up in Brooklyn too.”
She stared at him for a long time and then said “How do you know I’m from Brooklyn?”
And he said “You have a Brooklyn accent.”
She said “I do?” and the whole class nodded, and then she burst out laughing and said “I had no idea! The school where I learned to speak was in Brooklyn. I learned by moving my mouth and tongue the way my teachers did. So I guess it makes sense that I have their accent, I just never thought about it.”