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Why Do Our Memories Change? [Video]

We are certain that we remember events clearly, but most of us are only half right

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American


Where were you on September 11, 2001, when you first heard about the World Trade Center towers in New York City being hit by airplanes and collapsing? Almost all of us remember clearly where we were, how we heard the news and what images we first saw. Yet research shows that our recollections of past events are typically only about half correct—even though we are convinced that our memory is certain.

This disconnect is explored by Liz Phelps, a professor of psychology and neural science at New York University. Phelps concentrates on how learning and memory are changed by emotions. She explains why our memories can be so malleable in an engaging video called “Controlling Our Fears,” created by her N.Y.U. colleague Joseph LeDoux, an expert on the emotional brain. The video is the fourth in a series he is putting together with director Alexis Gambis called My Mind’s Eye. (The first episode featured Ned Block on the mind–body problem, the second video was with Michael Gazzaniga on free will and the third was with Nobel laureate Eric Kandel on how neurons in the brain learn and create memories in the first place.) LeDoux and Gambis have given Scientific American the chance to post these videos first, on our site.


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Credit: Labocine Youtube

 

In the video Phelps explains that our memories can change because each time we revisit them they become vulnerable. When we first lay down a memory, it takes the brain a little while to solidly store the information—a process called consolidation. And every time we subsequently recall that memory, it has to go through a new storage process—another slight delay for another consolidation. During that window, new information can interfere with the old information and alter the memory. Phelps says it is like playing the school game of telephone, where one student tells a short story to a second student, then that person retells it to a third, who tells it to a fourth, and so on. By the end of the chain the story is usually quite different from how it began.

This change in memory has been proved by experiments using drugs in rodents, and in exercises with people. Phelps describes this work in the video. She also notes how reconsolidation might be used to help people control unwanted memories that involve fear or anxiety. The enticing news is that we might someday be able to defuse such painful memories.

For fun, the Phelps interview comes with snippets of a related song that LeDoux recorded with his band, The Amygdaloids, called “I Just Want to Forget How to Remember You.” Enjoy.

Image from this video courtesy of Labocine.

Mark Fischetti has been a senior editor at Scientific American for 17 years and has covered sustainability issues, including climate, weather, environment, energy, food, water, biodiversity, population, and more. He assigns and edits feature articles, commentaries and news by journalists and scientists and also writes in those formats. He edits History, the magazine's department looking at science advances throughout time. He was founding managing editor of two spinoff magazines: Scientific American Mind and Scientific American Earth 3.0. His 2001 freelance article for the magazine, "Drowning New Orleans," predicted the widespread disaster that a storm like Hurricane Katrina would impose on the city. His video What Happens to Your Body after You Die?, has more than 12 million views on YouTube. Fischetti has written freelance articles for the New York Times, Sports Illustrated, Smithsonian, Technology Review, Fast Company, and many others. He co-authored the book Weaving the Web with Tim Berners-Lee, inventor of the World Wide Web, which tells the real story of how the Web was created. He also co-authored The New Killer Diseases with microbiologist Elinor Levy. Fischetti is a former managing editor of IEEE Spectrum Magazine and of Family Business Magazine. He has a physics degree and has twice served as the Attaway Fellow in Civic Culture at Centenary College of Louisiana, which awarded him an honorary doctorate. In 2021 he received the American Geophysical Union's Robert C. Cowen Award for Sustained Achievement in Science Journalism, which celebrates a career of outstanding reporting on the Earth and space sciences. He has appeared on NBC's Meet the Press, CNN, the History Channel, NPR News and many news radio stations. Follow Fischetti on X (formerly Twitter) @markfischetti

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