https://www.theguardian.com/tv-and-radio/2022/dec/16/pokemon-explosion-tv-japan-children-hospital
Twenty-five years ago, at precisely 6.51pm on 16 December 1997, hundreds of children across Japan experienced seizures. In total, 685 – 310 boys and 375 girls – were taken by ambulance to hospital. Within two days, 12,000 children had reported symptoms of illness. The common factor in this sudden mass outbreak was an unlikely culprit: an episode of the Pokémon cartoon series.
Twenty minutes into the cartoon, an explosion took place, illustrated by an animation technique known as paka paka, which broadcast alternating red and blue flashing lights at a rate of 12Hz for six seconds. Instantly, hundreds of children experienced photosensitive epileptic seizures – accounting for some, but far from all, of the hospitalisations.
The mystery persisted for four years, until it piqued the attention of Benjamin Radford, a research fellow at the Committee for Skeptical Inquiry in the US, and co-host of the podcast Squaring the Strange. “The investigation had just stalled, the mystery sort of faded away without an explanation,” he says. “I wanted to see if I could solve the case.”
The next day, in playgrounds and classrooms, in news bulletins and at breakfast tables, all the talk was of Pokémon Shock. At which point, more children began to feel unwell. This was exacerbated when, astonishingly, some news shows actually screened the offending clip. But this time, the symptoms (headaches, dizziness, vomiting) were, says Radford, “much more characteristic of mass sociogenic illness [MSI] than photosensitive epilepsy”.
According to Radford: “MSI is complex and often misunderstood, but basically it’s when anxiety manifests itself in physical symptoms that can be spread through social contact. It is often found in closed social units such as factories and schools, where there is a strong social hierarchy. The symptoms are real – the victims are not faking or making them up – but the cause is misattributed.” The condition is perhaps best understood as the placebo effect in reverse. People can make themselves ill from nothing more than an idea.