Amy Winehouse's mother thinks the singer may have suffered from Tourette's Syndrome.
The late Back to Black hitmaker was nicknamed Hurricane Amy as a youngster for her wild and outspoken ways but Janis Winehouse-Collins is unsure whether she may have been stricken with the neurological disorder, which causes physical and vocal tics.
Janis said: "She could well have been almost Tourette's, where she would just shout things out. We just do not know."
Janis remembers her daughter - who died of alcohol poisoning in July 2011 - as "gifted" and thinks she was too intelligent to "fit in" with her peers as a child.
She told People magazine: "I think that she was a special-needs kid in that she was so intelligent. She was so gifted, living in a world where she just wasn't average, where she didn't quite fit in. But it was a great life lived."
Four months after Amy died, a new album, Lioness: Hidden Treasures - comprising demo material - was released but Janis recently admitted she doesn't think her daughter would be happy about the release of more unfinished tracks because she was always so "fussy".
She said: "Amy was very fussy about what she did. Oh so precious. If she did something, she'd say 'No, that is not right.' You would say 'That is OK.' And she would say 'No, it's not.' And that was Amy."