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Once a month, this column will examine the insights that science offers about the way people learn, and how such findings could influence schools.

Most of us can remember a moment like this from our school years: the teacher poses a question – maybe it’s math, maybe history.  You raise your hand, you give your answer with full assurance. And then? You’re shot down. You got it wrong.

We remember moments like this because they brim with some of our least favorite emotions: shame, humiliation, self-recrimination, and that gutting sense that you want to melt into the floor. Ah yes, I remember it well.

As it turns out, though, such moments are ripe with learning opportunity. Contrary to what many of us might guess, making a mistake with high confidence and then being corrected is one of the most powerful ways to absorb something and retain it.

In recent years, cognitive scientists have done gobs of research on how making mistakes help us learn, much of it funded by the federal Institute for Education Science. Some findings make intuitive sense. Some are completely surprising. And many important findings that are relevant to teaching are not making it into the classroom, or penetrating very slowly.

Traditionally, educators and psychologists in the U.S. were not fans of allowing students to flounder. B.F. Skinner, the hugely influential 20th century behavioral psychologist, didn’t even like his lab rats and pigeons to err and constructed experiments to shape their behavior toward always getting the task right. “He thought if they made a mistake, the mistake would get entrenched, and you’d have to backtrack to erase it,” explains Janet Metcalfe, a professor of psychology at Columbia University, and the author of an impressive scientific review titled “Learning from Errors,” published earlier this year in Annual Review of Psychology.

“These wrong approaches are like crab grass, they are hard to get rid of and often have deep roots. You really have to undermine the roots of the misconception as well as strengthen the correct conception.”

American educators, perhaps influenced by Skinner, have tended to see things the same way. Classic studies by psychologists James Stigler of UCLA and the late Harold Stevenson, detailed in their 1994 book The Learning Gap, compared videotaped lessons in eighth-grade math in several countries. They found that American teachers emphasized specific procedures for solving problems, largely ignored errors and praised correct answers. Japanese teachers, by contrast, asked students to find their own way through problems and then led a discussion of common errors, why they might seem plausible and why they were wrong. Praise was rarely given and students were meant to see struggle and setbacks as part of learning. The difference, the authors believed, is one reason that Japanese students outperform Americans in math.

“Learning about what is wrong may hasten understanding of why the correct procedures are appropriate,” they wrote, “but errors may also be interpreted as failure. And Americans … strive to avoid situations where this might happen.”

The American allergy to errors began to ease with a burst of new studies by cognitive psychologists beginning this century. They showed clear benefits to engaging with mistakes—in both verbal and math tasks. For instance, Nate Kornell of Williams College conducted a word-pair experiment in which people were cued with a word (say, tree) and then asked to pair it a related “target” word (say, oak). He found that they remembered the target word significantly better if they had made a wrong guess (like maple or pine) and were corrected than if they were simply given the correct pairing and asked to memorize it.

Numerous other studies have confirmed and expanded upon this finding. Metcalfe and others have shown that on tests involving general knowledge (What’s the capital of Australia?), a wild guess doesn’t help with learning. “They have to be making a serious stab at the answer,” she notes. And it was Metcalfe and colleagues who showed that the more certain you are of your wrong answer, the better you will learn the right one after being corrected.

Why is this? The answer isn’t completely clear but it likely involves the fact that making an error rallies your attention — and even more so if you’re surprised that you got it wrong. In addition, it is easier to learn something new after you’ve summoned up your prior knowledge — a process neuroscientists call memory reconsolidation.

There’s hard, biological evidence for some of this. By placing electroencephalogram caps on subjects as they play videogames or do other tasks, scientists have identified specific signals in the brain linked to making errors. The first one, known as Error-Related Negativity or ERN, occurs just 50 millionths of a second after the error. That’s well before you are even conscious of the mistake! A second wave, called error positivity (Pe for short), comes 50 to 550 milliseconds later and is believed to reflect conscious attention to the error, usually followed by an effort to avoid repeating it.

“By taking the grade off their test I thought they might spend more time looking at what they got right and what they got wrong. I wanted to refocus them on actually learning the content.”

As an undergrad at Michigan State, Hans Schroder became so obsessed with error-related brain signaling that, he recalls, “I actually ‘married’ it on Facebook.” He also did serious work on the subject in psychologist Jason Moser’s lab there. Past research had shown that these signals relate to academic performance.

“The ERN tends to correlate with grade-point average. It’s linked with the ability to recognize when things don’t go as expected and to better working memory,” Schroder explains. “The Pe is more linked to effort, becoming aware of mistakes and rebounding.” While both signals emanate from a brain region called the anterior cingulate, the Pe involves more widespread activity as you allocate mental resources to improve your performance.

Schroder was especially interested in this effort-related activity and wanted to know if it was linked to a person’s attitude or mindset about his or her own ability. Stanford University psychologist Carol Dweck kicked off a wave of research in education and psychology with her work — and popular 2006 book, Mindset— defining two distinct “mindsets”: the belief that one’s intelligence is fixed or that it is fluid and can grow with effort. People with a fixed mindset (as measured on a standard questionnaire) tend to see errors as signs that they are not good at something. Those with a growth mindset see them as signs they need to work harder.

Schroder theorized that people with a growth mindset would have a stronger Pe signal following an error. This proved to be true in studies with both children and adults. Just as important, growth-minded people raised their game more in the wake of an error. For instance, he reports, growth-minded children playing a videogame in which they had to round up escaped zoo animals “were more accurate after making a mistake than kids who were fixed-minded.”

How do these psych lab results translate to the messier world of the classroom? A number of researchers are attempting to answer that question with studies that more closely mimic educational situations or by conducting research within schools.

Carnegie Mellon psychologist Robert Siegler, an expert on how children learn math, has delved deeply into the best way to give feedback on student errors. He has shown, for instance, that asking third and fourth graders to explain how someone got the wrong answer and also how someone got the right answer is enormously effective – more so than just asking the child to explain the correct procedure, as teachers so often do. Dislodging wrong ideas is important, he notes: “These wrong approaches are like crab grass, they are hard to get rid of and often have deep roots. You really have to undermine the roots of the misconception as well as strengthen the correct conception.”

Like Patel, Alcala says she was influenced by Dweck’s mindset framework. While not everyone in her economically and ethnically diverse classes masters all the math, “what I know for sure is that my kids never give up on my class.”

Such robust examples of teaching kids how to learn from their errors remain the exception in U.S. classrooms. Probably the biggest reason, Siegler suggests, is that “the people who write the textbooks don’t know about the research findings. There’s a lot of knowledge in the psychology of learning that hasn’t been incorporated into education.” Also, he notes, there’s a “common sense wisdom” to focusing almost exclusively on correct procedures. It’s what American teachers have always done.

And it’s what most of us believe in, the evidence be damned. Metcalfe has found that people are generally unaware of the benefits of bumping up against mistakes. This is true even after they participate in studies in which, again and again, they improve their performance after getting something wrong and being set straight.  When asked if they did better in trials where they were given the answer or those in which they erred and were corrected, they chose the former.

“Isn’t that amazing!” she says of this metacognitive blind spot. No wonder so many educators err when it comes to errors. “If teachers don’t realize that making errors will help learning, they will be like Skinner and say ‘I’ll just teach them the right thing.’ ”

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Letters to the Editor

2 Letters

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  1. Dear Ms. Wallis,
    I have just read your column “To Err is Human – And A Powerful Prelude to Learning”.

    I was reminded of a technique I used years ago when I was teaching (I’m now retired.) The program I used included daily spelling “tests”. I enclose tests in quotes because these were not graded. Instead, I would diagnose the errors and this would provide essential information for my next day’s lesson planning. More than two errors on a page was an indication that I should not move on, but instead continue to review. The errors were informative for me!

    An interesting technique I kind of stumbled on was that after I collected the papers, I would ask the students if there was any particular word they wanted to see written on the chalkboard. After they told me and I wrote it for them, I would ask why they were unsure of the spelling. Their responses were revealing. They would share their insecurity about the particular choice they had made. In some cases they had been correct. In others, not. But this technique provided them with a meta cognitive opportunity, the chance to assess their own learning. And for me, it was a little window into their individual thought processes which was not revealed by their written responses be they correct or incorrect.

    There might be some sort of study that could be done with this technique. I’m way past being able to conduct it. It was useful, however, and kind of fun.

    Emily Goldberg

  2. At the Algarve University we have developed the MILAGE LEARN+ app, for mobile devices and free, that was designed to help students learn autonomously and where they can learn by correcting themselves from the mistakes that they made. This is an international project with Portugal, Spain, Norway and Turkey funded by the European Program ERASMUS+.

    In a gamified environment the student can solve problems with different levels of difficulty and video resolution, to include low achievers and high performers. This app includes self-assessment and peer evaluation to stimulate autonomous work and assessment.

    When the students solve a problem, they have immediate feedback in two forms. One is in the form of instructions for self-assessment where they correct themselves and see what did wrong so they understand what they have to do to make it right. So they can learn from their mistakes. The other form is that they can watch a video that explains how the problem is solved.

    You can watch a video about its functionalities here and a tutorial about the use of the app MILAGE Learn+ Mathematics here:

    More information is also available at the website here:

    I would like to make available our platform so that you could test it with students also in the USA. The app was designed for mathematics but can be used also in other subjects for online learning, blended learning or flipped classroom.

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