False memory studies

False Memory Syndrome- FMS

“Do you swear to tell the truth, the whole truth, or whatever it is that you think you remember?” — Elizabeth Loftus

In 1990 George Franklin became the first ever US citizen convicted of murder by a witness who recovered repressed memories more than 20 years after the event. The fact that the witness was Franklin’s daughter, Eileen, ensured the case was splashed across the news media. Franklin was released in 1996 after 6 years in prison when irregularities were discovered in Eileen’s evidence: it emerged she had been hypnotised before testifying.

There is a good reason why hypnotised witnesses are barred from testifying in some jurisdictions: under hypnosis people are highly suggestible. Even without hypnosis, studies show that people’s memories are open to influence. But, can it be demonstrated in the lab that memories for entirely false events can be implanted?

False memories are hard to research for one simple reason: it’s difficult to verify whether the memories in question are false or not (Loftus, 1993). Often a considerable amount of time has passed since the original event and it’s not possible to corroborate what people say. But, while it’s difficult, it’s not impossible – it just takes some concerted effort.

Lost in the mall

Elizabeth Loftus, Distinguished Professor at the University of California, Irvine, has been at the forefront of psychological research into repressed memories and testified in George Franklin’s case. She has also carried out some fascinating research into the possibility of implanting false memories.

In a seminal study Loftus and Pickrell (1995) recruited 24 participants who were to be presented with four stories from when they were between 4 and 6 years old, three of which were true, and one false. To get the true stories, the researchers spoke to participants’ relatives to get three events for each person which had really happened. The events were chosen so that they were not traumatic or emotionally difficult to recall.

Each family was also asked to provide the circumstances of another event that could possibly have happened, but didn’t. In each case the false memory was for getting lost in a shopping mall. Relatives provided details of a specific shopping mall it could have been along with other details to make the fake story plausible. They also confirmed that an event like this had not actually occurred.

Do you remember this?

Participants themselves were told they were involved in a study about their ability to recall details of childhood memories. Each participant was first sent a written description of the four events their relatives had outlined – three being real and one fake. They were then asked to write down which events they remembered and more details of the events those events.

Then, soon after, participants were interviewed. At this point they were reminded about the four memories and asked to recall as much as they could about them. At a second interview a week later, a similar procedure was followed. At the end of both interviews participants rated the clarity of their memories.

It was then revealed to them that one of the memories was false and they were asked to guess which one it was. Of the 24 participants, 5 falsely recalled the made up ‘lost in the mall’ event as a real memory, although participants understandably found the implanted memory much less clear.

This may seem like quite an unimpressive proportion, but considering the very low level of suggestion or coercion involved in the interviews, it does at least show the possibility of implanting false memories.

A later study with more participants which examined a wider range of memories was carried out by Hyman and Pentland (1996). This found that, depending on experimental variables, at least some kind of false memory could be implanted in between 20% and 40% of participants.

But psychologists have done better. In a fantastically titled paper, ‘A picture is worth a thousand lies’, Kimbereley Wade and colleagues used a doctored photograph of a fictitious balloon flight to implant false memories (Wade, Garry, Read & Lindsay, 2002). Using similar interview procedures to Loftus and Pickrell (1995), they found that 50% of participants created either complete or partial false memories of the flight.

The bizarre case of Paul Ingram

Critics argue that the problem with these sorts of studies is that they only implant inconsequential memories. Traumatic memories, such as those claimed by George Franklin’s daughter, might be a completely different matter. This is a fair point and difficult to refute because it would be highly unethical to implant traumatic memories into participants.

Well, actually this has been done, in one of the most bizarre and dramatic false memory experiments ever documented.

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