On November 23, 1996, Bandai released a small plastic egg in Japan. Inside lived a digital pet with three buttons and a beeper, an alien who had arrived on Earth inside her shell. The device's name was a portmanteau of the Japanese words for "egg" and "watch," and it had no ambitions beyond asking for attention. Nobody predicted it would hand psychology a term researchers still use thirty years later.
The Tamagotchi effect has a deceptively simple definition: it is the emotional attachment people develop toward machines, robots, and software agents. The original toy earned the honor the hard way. Conceived by Aki Maita, a Bandai employee, and Akihiro Yokoi of WiZ, the first device was designed to be worn like a wristwatch. It had no pause button. Ignored too long, a pet fell sick and died for good, and owners — most of them children — grieved. The collective distress was so well documented that Maita and Yokoi won the 1997 Ig Nobel Prize in Economics "for diverting millions of person-hours of work into the husbandry of virtual pets."
The effect's grip showed up fastest in classrooms. In 1997, schools in China, Hong Kong, Thailand, and the United States banned Tamagotchis as distractions. The New York Times reported one school acting after third graders put down their pencils mid-test to feed their pets, while teachers described children checking the devices "every five seconds." Parents were drafted into babysitting beeping eggs during work hours. A thing that needed care every few hours had turned a generation into volunteer caretakers.
Psychologists and sociologists took note. Sherry Turkle, the MIT professor and psychoanalyst, spent years observing children with virtual pets. She classified devices like the Tamagotchi as "relational artifacts," objects built to invite a relationship, and found children sorting their pets into a new category: "sort of alive" — not alive the way an animal is, but alive in their own way. Her conclusion became famous in design circles: when it comes to bonding, nurturance is the killer app. Researchers Linda-Renée Bloch and Dafna Lemish made a similar argument about design, pointing out that the toy's size — small enough to hold in a palm, take to bed, hide in a pocket — produced an intimacy no screen had managed before.
That intimacy left a lasting mark. By spring 1998 the original model had sold nearly 40 million units; as of 2025, total sales top 98 million. In May 2025, Tamagotchi entered the World Video Game Hall of Fame at The Strong National Museum of Play alongside Defender, GoldenEye 007, and Quake, honored for bridging toys and video games and credited with spurring an entire genre of pet sims, from Neopets to Nintendogs.
And the term still does real work. Researchers building AI companions continue to cite the Tamagotchi effect by name; a recent study tested generative-AI "Tamagotchis" that render a patient's recovery as images, betting that caring for a creature helps people care about their own progress.
Here's the honest lesson of 1996: the effect was never about the pixels. It's about what care does to the caregiver. A creature that needs you always feels a little bit alive — that was true when it beeped from a keychain, and it's true now that it types back from a screen. Thirty years on, we're still raising the same egg.