We like to think change is simple. Decide. Plan. Act.
If that were true, New Year’s resolutions would be easy. In reality, most don’t last.*
*Reports indicate 9 in 10 people don’t achieve them.
Often, we’ll do the new behaviour for a few days, maybe a few weeks, and then the old pattern returns. Not because we’re weak, but because lasting change depends on how the brain responds when reality doesn’t match what it expected.
Sometimes it treats the mismatch as useful information and updates. Other times it minimizes it, explains it away, or retreats back to the familiar, so the old pattern stays in place.
That mismatch is called a prediction error.
Our brains are constantly forecasting what will happen next. Most of the time, reality fits well enough. When it does, nothing changes. There’s no reason to revise our model of the world or of ourselves.
For change to happen, something has to be off.
Not catastrophically wrong. Not barely noticeable. Just different enough to matter.
If a new behaviour produces exactly what our brain already predicted, there’s no update. The old model stays in place. This is why repeating familiar routines rarely leads to real change, even when motivation is high.
But when reality deviates in a meaningful way, the brain takes notice.
“That wasn’t supposed to happen.” “I didn’t expect that.” “That worked better than I thought.”
That moment of surprise is the signal the brain uses to learn.
Without prediction error, there is nothing to correct. No reason to revise expectations. No reason to change how the future is forecast.
This is also why many change efforts fail.
We either stay too close to what we already know, so the brain registers no meaningful difference. Or we push too far, creating so much mismatch that the brain treats it as noise or threat—and refuses to integrate it.
Change requires a narrow window.
Enough surprise to disrupt the old prediction. Enough stability to be usable.
When the error is right-sized, the brain adjusts its expectations. Over time, what once felt unfamiliar becomes normal. The forecast changes. And when the forecast changes, behaviour follows.
This is the quiet truth behind lasting change.
We don’t change simply because we want to. We change because our brain encounters evidence it can’t ignore.
So the question isn’t “Do we want to change?”
It’s “Do we know how to give the brain what it needs to update?”
Source: Ramon David – Founder, Brain First Inc
https://www.brainfirstinstitute.com/blog/unlocking-habit-mastery-the-neuroscience-behind-lasting-change
