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"There has also been, he says, "a real push in opinion pieces and popular-press books that are sloppy scientifically but stated so confidently. The ideas in these books are not peer-reviewed." The published studies they cite tend to have small samples and no control groups, and to be based on associations rather than proving cause. "People will say: 'The iPhone was invented in 2007 and Instagram became popular in 2012 and, oh my God, look, tech use has gone up at the same time mental health has gone down!' It seems like common sense - that's why you have this kind of consensus. But it just isn't scientific." In 2023, Przybylski and his colleagues looked at data from almost 12,000 children in the US aged between nine and 12 and found no impact from screen time on functional connectivity ("how different parts of the brain kind of talk to each other", he explains), as measured with fMRI scans while the children completed tasks. They also found no negative impact on the children's self-reported wellbeing. "If you publish a study like we do, where we cross our Ts, we dot our Is, we state our hypotheses before we see the data, we share the data and the code, those types of studies don't show the negative effects that we expect to see.""

"But we're not entirely to blame if technology is making us less intelligent. After all, it was designed to captivate us totally. Silicon Valley's dirtiest design feature - which is everywhere once you spot it - is the infinite scroll, likened to the "bottomless soup bowl" experiment, in which participants will keep mindlessly eating from a soup bowl if it keeps refilling. An online feed that constantly "refills" manipulates the brain's dopaminergic reward system in a similar way. These powerful dopamine-driven loops of endless "seeking" can become addictive."

"What bothered Jeff, however, was not so much the loot boxes or the skins in themselves but another phenomenon that they have spawned: skins gambling. This works like any other casino. You load up your account with funds, place a bet, watch the graphics spin and either win or lose. The big difference in this case is that the casino taking your bet has no gambling licence and, in some cases, no reliable mechanism to stop under-18s getting their first taste of gambling - via an online ecosystem that is, to many parents, a total mystery."