Study points to long-term recall of very early experiences

Most adults can't recall events that took place before they were 3 or 4 years old—a phenomenon called childhood amnesia. While some people can remember what happened at an earlier age, the veracity of their memories is often questioned. Now a new longitudinal study has found that events experienced by children as young as 2 can be recalled after long delays.

The study, by researchers at the University of Otago (in New Zealand), appears in the journal .

To determine at what age our earliest memories occur, the researchers looked at about 50 children and their parents. The children played a unique game when they were 2- to 4-year-olds. In the game, children placed a large object in a hole at the top of a machine and turned a handle on the side. When a bell rang, a small but otherwise identical object was delivered through a door at the bottom of the machine.

Six years later, the researchers interviewed the children and their parents to determine how well they remembered playing the game. Only about a fifth of the children recalled the event, including two children who were under 3 years old when they played the game. About half of the parents remembered the event. Parents and children who recalled the event provided very similar reports about the game.

Although the researchers couldn't predict children's long-term recall on the basis of the youngsters' general memory and language skills, they found evidence that talking about the event soon after it occurred may have helped preserve it in the memories of those who remembered it.

"Our results are consistent with theories that suggest that basic capacity for remembering our own experiences may be in place by 2 years of age," according to Fiona Jack, postdoctoral fellow at the University of Otago, who led the study. "The study has implications in clinical and legal settings, where it is often important to know how likely it is that a particular memory of an early experience is in fact genuine."

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