The Mandela Effect: why so many people remember it wrong

When memory fails as a group

The name comes from people who "remembered" Nelson Mandela dying in prison in the 1980s, although he was released and became president. The striking part is not that one person is wrong, but that many people are wrong in the same way.

Read also: Why you can't tickle yourself and Why do we dream? What science has found so far.

What the study tested

Researchers at the University of Chicago tested well-known images, such as characters and logos, asking participants to pick the correct version among similar options. For some images, most people chose the same wrong version, with high confidence. The authors called it the Visual Mandela Effect.

Source: Prasad and Bainbridge, The Visual Mandela Effect, Psychological Science, 2022.

Why it happens

The study found no single explanation. The error did not depend on how often people saw the image, and it did not always follow the most common format for that kind of figure. The authors suggest that some images have details the brain tends to complete in the same way across different people.

Memory does not work like a recording. It rebuilds the event each time, and expectations and patterns enter that rebuild.

One word changes the memory

In 1974, psychologists Elizabeth Loftus and John Palmer showed students films of car crashes. Then they asked how fast the cars were going when they hit each other. For some, the verb was mild, like hit; for others, it was strong, like smashed. Those who heard the strong verb estimated higher speeds.

A week later, the researchers asked whether anyone had seen broken glass. There was no broken glass in the film, but those who had heard the strong verb said yes more often. Memory is rebuilt every time we recall something, and information that arrives later can blend into what was seen.

Source: Loftus and Palmer, Reconstruction of automobile destruction, Journal of Verbal Learning and Verbal Behavior, 1974.

Remembering something that never appeared

Another classic experiment, from 1995, helps explain why so many people get it wrong in the same way. Participants heard lists of words linked to a theme, such as bed, rest, tired and dream, but the central word, sleep, was never said. When recalling the list, many included sleep, and with high confidence.

The brain stores the general meaning and fills in the rest with what is most expected. The Mandela effect works in a similar way: everyone fills the gap with the version that feels most natural, so the error comes out the same in different people.

Source: Roediger and McDermott, Creating false memories, Journal of Experimental Psychology, 1995.

What it teaches

Being certain about a memory does not make it accurate. For important decisions, check records instead of trusting memory alone, yours or a group's.

See also why we do not remember our first years.

Read also: What your favorite color says about you.