The "Pokemon Shock" Incident: Mass Seizures in Japan, 1997
Casal dels Infants – On December 16, 1997, a Pokemon episode triggered a major health incident in Japan, later known as the “Pokemon Shock.” The episode, titled Dennō Senshi Porygon (Electric Soldier Porygon), caused hundreds, eventually thousands, of children to experience seizures, nausea, and other symptoms after watching it on television.
The episode featured a scene where the main characters, Ash and his team, enter a digital world and confront a Pokemon named Porygon. In one of the climactic moments, Pikachu destroys an antivirus program with an electric attack, triggering intense flashes of red and blue lights that flickered rapidly for several seconds. This visual sequence became the catalyst for the Pokemon Shock incident, sparking mass health reactions among young viewers.
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The animation technique used is known as “paka paka.” It involves rapidly alternating red and blue flashes at a frequency of 12 Hz. These effects unintentionally triggered photosensitive epilepsy, a condition in which flashing lights can cause seizures in some individuals.
Shortly after the episode aired, 685 children reported symptoms such as seizures, nausea, and loss of consciousness. Within two days, that number surged to 12,000 reports, mostly involving dizziness, blurred vision, and nausea. The Japanese government called an emergency meeting, and police began investigating the Pokemon production team.
A 10-year-old boy described his experience:
“Near the end of the show, there was a loud explosion, and I had to shut my eyes because of a huge yellow flash, like a camera flash.”
A 15-year-old girl added:
“When I saw the red and blue lights flickering, my body felt stiff. I don’t remember what happened after that.”
Benjamin Radford of the Committee for Skeptical Inquiry explained that although only a small percentage of children suffer from photosensitive epilepsy, mass hysteria largely caused the massive spike in cases.
Radford explained that many children may not have experienced symptoms initially. However, after widespread media coverage and playground discussions, more children began reporting similar symptoms. These were triggered by social suggestion rather than the broadcast itself.
“The symptoms were real, but they were caused by environmental influence, not direct exposure to the animation,” Radford stated.
The incident remains one of the most notable cases of mass hysteria linked to television. As a result, Japan’s animation industry adopted stricter regulations on flashing effects in media. The network never re-aired the episode, and the producers effectively removed the character Porygon from future Pokémon episodes.
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