Does brain training actually work?

We build a working-memory game, so you would expect us to tell you that brain training makes you smarter. We are not going to, because the evidence does not support it — and we would rather be the people who told you straight.

Here is what the research actually says, and what we think is a defensible reason to play anyway.

The claim that started it

In 2008, Susanne Jaeggi and colleagues published a study in PNAS reporting something remarkable: people who trained on the dual n-back task improved not just at the task, but on tests of fluid intelligence — the ability to reason through genuinely new problems. More training produced bigger gains. The effect size was substantial.

That single paper launched an industry. If a free memory game could raise your general intelligence, who wouldn’t play?

What happened when people checked

Other laboratories repeated the work with tighter designs — crucially, with active control groups who practised some other demanding task, so expectation and test-practice affected both groups equally.

The picture got much soberer. Redick and colleagues (2013) found no convincing evidence of an intelligence gain. Two large meta-analytic reviews — Melby-Lervåg and Hulme (2013) and Melby-Lervåg, Redick and Hulme (2016) — pooled the literature and reached a consistent verdict:

• Working-memory training reliably improves the trained ability. That part is real.
• Those gains do not generalise to intelligence, reading, arithmetic, or attention.
• The gains often fade within weeks of stopping.

A competing meta-analysis by Au and colleagues (2015) did find a small positive effect on fluid intelligence — so the debate is not formally closed. But the honest summary is: the strong version of the claim did not survive scrutiny.

The distinction that matters

Researchers separate two things, and almost every misleading advert blurs them:

You will absolutely get better at n-back. You will get better at holding several things in mind at once while doing n-back. What you should not expect is for that to make you a better negotiator, coder, or student.

The industry got fined for this

This is not merely an academic quarrel. In 2016 the US Federal Trade Commission fined Lumosity’s maker $2 million and required it to notify subscribers, finding the company had “preyed on consumers’ fears” with unsupported claims that its games improved performance at work and school and staved off cognitive decline. The regulator’s conclusion was blunt: the science was not there.

So why play at all?

Because “it doesn’t raise your IQ” is not the same as “it is worthless.” A good reason to play an n-back game is the same reason to play chess or do a crossword:

• It is genuinely, satisfyingly hard — a rare kind of focused difficulty that most of your day does not offer.
• You measurably improve at a real skill: holding and updating information under time pressure.
• It takes a few minutes, costs nothing, and beats doomscrolling.

That is an honest pitch, and it is the one we make. Our N-Back is built to be a beautiful, focused workout you actually want to return to — not a promise about your intelligence.

The rule of thumb

If a brain-training product tells you it will make you smarter, be sceptical — that claim has repeatedly failed careful testing, and one company paid $2 million for making it. If it tells you it will make you better at itself, and it is enjoyable enough that you’ll come back, that is a claim that holds up.

Want the deeper dive on the task itself? Read what dual n-back is and what the science says.