To conduct the study, a team led by psychologist Lawrence Patihis of the University of
California, Irvine, recruited a sample group of people all of approximately the same age and divided them into two subgroups: those with ordinary memory and those with what is known as highly superior autobiographical memory (HSAM). You’ve met people like that before, and they can be downright eerie. They’re the ones who can tell you the exact date on which particular events happened — whether in their own lives or in the news — as well as all manner of minute additional details surrounding the event that most people would forget the second they happened.
To screen for HSAM, the researchers had all the subjects take a quiz that asked such questions as “[On what date] did an Iraqi journalist hurl two shoes at President Bush?” or “What public event occurred on Oct. 11, 2002?” Those who excelled on that part of the screening would move to a second stage, in which they were given random, computer-generated dates and asked to say the day of the week on which it fell, and to recall both a personal experience that occurred that day and a public event that could be verified with a search engine.
“It was a Monday,” said one person asked about Oct. 19, 1987. “That was the day of the big stock-market crash and the cellist Jacqueline du Pré died that day.” That’s some pretty specific recall. Ultimately, 20 subjects qualified for the HSAM group and another 38 went into the ordinary-memory category. Both groups were then tested for their ability to resist developing false memories during a series of exercises designed to implant them.
In one, for example, the investigators spoke with the subjects about the Sept. 11 terrorist attacks and mentioned in passing the footage that had been captured of United Flight 93 crashing in Pennsylvania — footage, of course, that does not exist. In both groups — HSAM subjects and those with normal memories — about 1 in 5 people “remembered” seeing this footage when asked about it later.
“It just seemed like something was falling out of the sky,” said one of the HSAM participants. “I was just, you know, kind of stunned by watching it, you know, go down.”
Word recall was also hazy. The scientists showed participants word lists, then removed the lists and tested the subjects on words that had and hadn’t been included. The lists all contained so-called lures — words that would make subjects think of other, related ones. The words
pillow,
duvet and
nap, for example, might lead to a false memory of seeing the word
sleep.
All of the participants in both groups fell for the lures, with at least eight such errors per person—though some tallied as many as 20. Both groups also performed unreliably when shown photographs and fed lures intended to make them think they’d seen details in the pictures they hadn’t. Here too, the HSAM subjects cooked up as many fake images as the ordinary folks.