His 2014 book, The Body Keeps the Score, has become a huge pandemic hit, topping bestseller lists this summer and becoming a meme on social media. What does it tell us about the world we live in?

When Dr Bessel van der Kolk published The Body Keeps the Score in 2014, it was a huge hit with yoga people. That is not a euphemism for “rich, underoccupied people”, it is just people who do yoga. Certain physical activities do something weird to your brain: ancient memories resurface, often with new feelings or perspectives attached; you start treating yourself with more compassion. It doesn’t make sense until you read Van der Kolk. After that, nothing has ever made more sense.

His thesis centres on trauma: the urgent work of the brain after a traumatic event is to suppress it, through forgetting or self-blame, to avoid being ostracised. But the body does not forget; physiological changes result, a “recalibration of the brain’s alarm system, an increase in stress hormones, an alteration in the system that filters relevant information from irrelevant”, as he says in his book. The stress is stored in the muscles and does not dissipate. This has profound ramifications for talking therapies and their limits: the rational mind cannot do the repair work on its own, since that part of you is pretending it has already been repaired.