Learning goes best when people fail 15% of the time, according to a new study.

Educators and educational scholars have long recognized that there is something of a “sweet spot” when it comes to learning. That is, we learn best when we aim to grasp something just outside the bounds of our existing knowledge. When a challenge is too simple, we don’t learn anything new; likewise, we don’t enhance our knowledge when a challenge is so difficult that we fail entirely or give up.

“These ideas that were out there in the education field—that there is this ‘zone of proximal difficulty,’ in which you ought to be maximizing your learning—we’ve put that on a mathematical footing,” says lead author Robert Wilson, an assistant professor of psychology and cognitive science at the University of Arizona.

The '85% rule' of learning

The researchers came up with the so-called “85% Rule” after conducting a series of machine-learning experiments in which they taught computers simple tasks, such as classifying different patterns into one of two categories or classifying photographs of handwritten digits as odd versus even numbers, or low versus high numbers.

The computers learned fastest in situations in which the difficulty was such that they responded with 85% accuracy.

“If you have an error rate of 15% or accuracy of 85%, you are always maximizing your rate of learning in these two-choice tasks,” Wilson says.

When researchers looked at previous studies of animal learning, they found that the 85% Rule held true in those instances as well, Wilson says.

When we think about how humans learn, the 85% Rule would mostly likely apply to perceptual learning, in which we gradually learn through experience and examples, Wilson says. Imagine, for instance, a radiologist learning to tell the difference between images of tumors and non-tumors.

“You get better at figuring out there’s a tumor in an image over time, and you need experience and you need examples to get better,” Wilson says.

“I can imagine giving easy examples and giving difficult examples and giving intermediate examples. If I give really easy examples, you get 100% right all the time and there’s nothing left to learn. If I give really hard examples, you’ll be 50% correct and still not learning anything new, whereas if I give you something in between, you can be at this sweet spot where you are getting the most information from each particular example.”

Don't aim for the Easy A

Since Wilson and his collaborators were looking only at simple tasks in which there was a clear correct and incorrect answer, Wilson won’t go so far as to say that students should aim for a B average in school. However, he does think there might be some lessons for education that are worth further exploration.

“If you are taking classes that are too easy and acing them all the time, then you probably aren’t getting as much out of a class as someone who’s struggling but managing to keep up,” he says. “The hope is we can expand this work and start to talk about more complicated forms of learning.”