Unlearning in Education: The Missing Step in Teaching

Most discussions about education focus on what needs to be taught. Far fewer ask what needs to be unlearned. Yet for many children, the barrier to progress is not a lack of exposure to correct information, but the persistence of incorrect prior learning.

 

Why Unlearning Matters

When a child has absorbed inaccurate knowledge — whether from earlier instruction, cultural messages, or even well‑meaning teachers — the brain does not simply erase it when new information arrives. Instead, the old mapping remains dominant. The new teaching collides with the earlier model, often producing distortion, rejection, or disengagement.

 

This is why two children can sit through the same lesson and walk away with completely different outcomes. One builds on a solid foundation. The other struggles against interference from faulty priors.

 

A Classroom Example

In my work with over 80 dyslexic students, almost all arrived with the same foundational problem: they had been taught letter sounds with added “uh” sounds — buh, cuh, tuh. These impure sounds created lasting interference. Blending became distorted. The brain stored inaccurate links between letters and sounds. Later, when accurate teaching was introduced, it collided with the earlier model and was often rejected.

 

Only when I deliberately helped students unlearn the faulty sounds and replace them with crisp, pure phonemes did decoding improve. Confidence returned. Many went on to excel.

 

Beyond Literacy

Unlearning is not limited to phonics. It applies across subjects:

 

Mathematics misconceptions and beyond

— children who believe subtraction always makes numbers smaller struggle with negative numbers.

— Fractions and the “Bigger Number” Trap

One of my earliest students simply could not understand why one‑half was larger than one‑quarter. To him, the rule was clear: four is bigger than two, therefore 1/4 must be bigger than 1/2. His prior learning about whole numbers was colliding with the new concept of fractions.

I overcame this by using something tangible — an orange. First, I cut it into two pieces and explained that this was “one orange cut into two,” which is why we call it one over two. Then I cut those halves again to show how we got one over four. Once he saw that quarters were smaller pieces of the same whole, the misconception dissolved. From that moment, fractions were no longer a mystery.

This same dynamic plays out far beyond the classroom. Once people have invested years in a particular worldview, they often resist new information that contradicts it. In science, David Bohm’s theories faced resistance not because they lacked merit, but because they threatened long‑standing frameworks. In everyday life, political or religious convictions formed early can be just as difficult to revise. The mechanism is the same: the brain protects its earlier maps, and unlearning becomes the hardest step.

Science myths — prior beliefs about gravity or the earth’s shape can block accurate understanding.

 

Language learning — mispronunciations or mistranslations can persist unless explicitly corrected.

 

Unlearning also applies to emotional scripts. A child who has repeatedly felt unsafe or humiliated in learning contexts may reject even accurate instruction, because the brain tags it with the same threat response. Correcting knowledge must go hand‑in‑hand with rebuilding trust.

 

The Teacher’s Role

Effective teaching is not just about delivering correct content. It is about:

 

Surfacing prior learning — accurate or inaccurate.

 

Creating psychological safety so revision feels possible.

 

Providing structured practice that allows the brain to overwrite faulty maps.

 

This is diagnostic teaching: treating prior learning as data, not as an inconvenience.