Why, he and his colleagues want to know, do some people benefit from turning inwards to understand their feelings, while others are apt to fall apart when they engage in precisely the same behaviour? Are there right and wrong ways to communicate with yourself, and if so, are there techniques that might usefully be employed by those with inner voices that are just a little too loud? Kross runs the wonderfully named Emotion and Self Control Lab at Michigan University, an institution he founded and where he has devoted the greater part of his career to studying the silent conversations people have with themselves: internal dialogues that powerfully influence how they live their lives. At the peak of his anxiety, his negative thoughts running wildly on a loop, he found himself, somewhat comically, Googling “bodyguards for academics”. But telling himself this did no good at all.

Kross, whose area of research is the science of introspection, knew that he was overreacting that he had fallen victim to what he calls “chatter”. Ten years ago, Kross found himself sitting up late at night with a baseball bat in his hand, waiting for an imaginary assailant he was convinced was about to break into his house – a figure conjured by his frantic mind after he received a threatening letter from a stranger who’d seen him on TV.

A s Ethan Kross, an American experimental psychologist and neuroscientist, will cheerfully testify, the person who doesn’t sometimes find themselves listening to an unhelpful voice in their head probably doesn’t exist.

Chatter by Ethan Kross