by Patrick Appel
A reader sums up research on the unreliability of memory:
Although racism may infect certain aspects of lineup procedures and lead to more misidentifications, we are not particularly good at remembering anything even when racism is not involved. Psychologists who study memory call memories for important or exciting events, "flashbulb memories," so named because the holders of these memories believe their memories are so accurate that they have a perfect picture in their minds of the events that transpired, as if a flash went off in their brains to capture the memory.
The quintessential flashbulb memory is of the JFK assassination. People always claim to know exactly where they were when they heard the news. Psychologists wondered whether people's memories were really as accurate as their confidence suggested and also what makes people so confident. Many studies have followed in which researchers interviewed people right after a big, exciting event (the Challenger explosion or the OJ Simpson car chase or verdict, for example), recorded their memories, and then interviewed the people again months or even years later to determine whether they still have accurate memories. Researchers almost always find that people are not as accurate as they think they are, and everyone is usually completely confident their memories are accurate.
Researchers are not quite sure what causes us to have so much confidence in our memories, but it does seem that the more dramatic the event, the more confident we are in our memories of it. Some researchers have suggested that the same principles would work if you witnessed a crime. While your memories of the details of a crime might be no more accurate than any other event, you might think you absolutely remember everything, just like we do with flashbulb memories.
To give you an example of how bad our memories are, I will tell you about a woman we called for my college psychology thesis. We interviewed people within one week of 9/11 and then again 4 months later. One woman told us in September that she was in her North Carolina kitchen when she heard the news about the towers in NY. When we called her back in February, she told us she was on a plane to Arizona when she heard the news. In February, we asked her to rate her confidence in the accuracy of her memory on a scale from 1 to 10. She was a 10, meaning she believed with 100% accuracy that she heard about 9/11 on a plane to AZ, not in her NC kitchen.
Another reader shares a personal experience:
I was mugged once some years ago and was called in for a line up. It was night, the mugger was wearing a hoodie and for most of the time during the mugging there was a street light behind him. When I went in to the line up, I said I was 90% sure it was number 5. The officer questioned my 90% saying "Are you sure you're just 90% sure? We know it's the guy". I stuck to my 90%. I simply wasn't 100% sure and explained why (night, hoodie, street light).
After doing the line up, I was taken into an office with a detective to make a statement. When I got to the 90% sure thing, the detective started to get pretty agitated.
So, he stops the tape recorder and starts grilling me about my insistence on not saying I was sure it was the mugger. He got really angry and then said, "Don't give me that bullshit! We know it's the guy. Just say it's him, damnit!". He turns the tape recorder on and again I say I was 90% sure. So, he gets visibly angry, turns off the tape recorder and storms out of the office telling me I can get the hell out of there.
This was all for a string of muggings where no one got hurt and the total take was maybe $100. I wonder what kind of pressure law enforcement puts on eyewitnesses and victims of higher crimes.