Actress Carey Mulligan has urged people to keep close ties with relatives with dementia, even if they no longer recognise them.
Miss Mulligan, who is an ambassador for the Alzheimer's Society, spoke movingly of her relationship with her grandmother who has the disease.
On a special episode of Radio 4's Today programme, she said her and her mother's visits to her grandmother Margaret had a calming influence, despite the fact 'Nans' hadn't recognised either one of them for years.
The Great Gatsby and Pride & Prejudice actress, 31, argued the symptoms of dementia did not offer an excuse for people to stop bothering with their relatives.
"I've certainly had it in my experience that people with my grandmother have gone 'well she doesn't know me. It doesn't matter that I don't visit because she doesn't know me'," she said.