My cousin began talking to herself around age 13. She doesn't talk aloud, but her mouth moves and she laughs and her eyes flicker when this spell comes over her, she also walks along in a world of her own making mannersisms and talking. When I ask her who she is talking to she either becomes aggressive or denies it. I don't believe she realises she is doing it. Her parents won't seek medical help and I am wondering if I am jumping to conclusions.
There is a history of mental illnesses in my family including depression and tourettes.