Natural speech patterns could predict a decline in cognitive function and may even point to early signs of dementia, a new study suggests.

For most people, memories come with a vivid mental picture: the face of a friend, the layout of a childhood home, the colours of a sunset. For others, those pictures simply don’t exist.

It’s 2014, and Joyce Nduku is turning 60. Unlike most sixty-year-olds cooling off from years of work, to recline into ...