Geoffrey Hinton, aged 75, announced his resignation from Google in a statement to the New York Times, saying he now regretted his work.
And in a BBC interview on Monday, he said: "I can now just speak freely about what I think the dangers might be.
"And some of them are quite scary."
Dr Hinton's pioneering research on deep learning and neural networks has paved the way for current AI systems like ChatGPT.
