Growth Mindset and Limiting Beliefs:
Can You Really Rewire Your Brain?

Search for how to change a limiting belief and you will find big promises: rewire your brain in thirty days, adopt a growth mindset, repeat an affirmation until it sticks. If you have tried those and felt worse, you are not doing it wrong.

Who Told You That? The Beliefs That Keep You Small, and the Choices That Set You Free takes the science seriously, and is just as serious about its limits. Mariyah D. Acka’a writes that the reader ‘deserves to know where the limits actually sit before they begin the work.’ This article follows the book’s lead.

What the book means by rewiring the brain

Chapter 6, Rewiring the Brain, describes neuroplasticity as the brain’s capacity to reorganise itself throughout life. Underneath it sits Hebb’s principle – neurons that fire together wire together. In the book’s account, each time a thought is repeated a pathway activates, and the more often it activates, the more efficient it becomes. That is how a self-limiting belief becomes entrenched. It is also how it can be loosened.

Mariyah describes how this felt in her own life. The belief that the youngest daughter defers and stays in her lane fired so automatically that not acting stopped feeling like a choice. ‘It felt like the truth of who I was.’

The companion workbook adds a careful note. ‘Neurons that fire together wire together’ is a familiar shorthand, but the exercise itself is closer to the graded belief work of cognitive behavioural therapy than to the underlying neurobiology. In the workbook’s words, ‘The point is operational, not neurological’: the more often you practise the new thought in place of the old one, the more available it becomes.

Why positive affirmations can backfire

If the brain learns through repetition, why not just repeat something positive? Chapter 6 cites research by Joanne Wood and colleagues which found that repeating an over-positive statement left people with low self-esteem feeling worse, not better. As the book puts it, ‘the mind argues with a sentence it does not believe.’

Mariyah tells how she found this out. After getting a role she had doubted she could win, she sat quietly in leadership meetings while an old thought fired: they are going to realise you don’t belong here. She tried replacing it with ‘I am exactly where I am supposed to be’. It bounced off, and she felt more fraudulent than before. What worked was smaller: ‘maybe I don’t need to know everything to be here.’ Believable. Not the first time, nor the tenth – but eventually, with repetition, it began to hold.

The book calls this a bridging belief: not the opposite of the old belief, but the smallest true statement that moves one step away from it. ‘I am learning how money actually works’ instead of ‘I am great with money’. If a sceptical part of you objects, soften it – add maybe, I am learning to, some of, yet.

What neuroplasticity doesn’t mean

This is the section most self-help leaves out. The book names three limits.

• It is slow. The thirty-day reframe and the twenty-one-day habit are, in the book’s words, ‘marketing, not neuroscience.’ Change in deeply encoded patterns takes months and often years, with backslides along the way. If the old pattern is still firing strongly six weeks in, you have not failed – you are roughly where the research would predict.
• It is not unlimited. Patterns laid down very early, or reinforced by trauma, are often more resistant to standard reframing and may need trauma-specific approaches. If a pattern refuses to soften despite earnest work, the book calls that information, not weakness. If this is you, please consider working with a qualified therapist; our safeguarding page lists places to start.
• One belief is not a whole identity. Rewiring one belief is a real victory, and a small one. Most people describe this work not as transformation but as steady, incremental refinement.

The book adds that the brain does not change in isolation. A new pathway lives inside a body, a household, a workplace and a culture, and when those pull towards the old pattern, they often win. ‘This is not a failure of practice.’ It is why the later chapters take the work outward.

What growth mindset doesn’t mean

Chapter 12 turns to Carol Dweck’s research at Stanford, which found that whether people believe ability can grow shapes how they meet difficulty – whether they persist or give up – and, over time, how they perform. The book applies this to readiness: ‘I’m not ready yet’ and ‘I’m just not good at this’ are the same sentence, and the sentence that replaces both is ‘I have not done it yet.’

Then comes the honesty. Growth mindset, the book says, has been ‘oversold almost everywhere it appears.’ When researchers tested the interventions properly – large, pre-registered studies run by people with no stake in the answer – the effects were much smaller than the popular version promised. Telling someone their intelligence can grow changes what they say they believe; it does not, on its own, reliably change what they achieve. The effect is real but modest, and it concentrates among people who are struggling or arrived without advantages.

So the book makes a narrower claim: the belief that you cannot change is doing harm now, and you are entitled to examine it. What you build afterwards is still work.

When you don’t have a net

Advice to ‘fail forward’ assumes failure costs only a bruised ego. Chapter 12 recognises that for many people – whose visa depends on their job, who are first in their family in the room, who support others – that assumption does not hold. Caution in those conditions, the book says, ‘is not a fixed mindset. It is an accurate reading of your actual conditions.’

Its adaptation: ‘If you cannot afford to fail large, you must learn to fail small.’ Size each experiment to what you can survive, and where the net is truly missing, build it first.

Where to go deeper

• Chapter 6 and Workbook Tool 6 – The Bridging Belief. Write a bridge your sceptical self will not reject, keep it visible, and track how believable it feels across four weeks.
• Chapter 12 and Workbook Tool 12 – The Learning Lens. Catch the moments you treat a difficulty as a verdict on your character, reframe them, and re-read an old failure for what it taught you.

If your limiting belief often arrives as a harsh inner voice, try The Critic, a free game for arguing back, or browse the games page. To find which belief pattern is most active in your life, take the free Freedom Assessment, or read Chapter 1 free.

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