Can You Increase Your IQ Score? The Scientific Consensus

The Uncomfortable Truth About "Getting Smarter"

I have lost count of how many times someone has asked me whether they should invest in brain training apps, nootropic stacks, or intensive memory programs. The question comes from a reasonable place. If you can train your body to run faster, why not train your brain to think faster?

The analogy breaks down in an important way. When you train for a marathon, you are optimizing specific muscle fibers, cardiovascular capacity, and running economy. These improvements transfer directly to race day. But when you train on Lumosity games, you are optimizing for Lumosity games. Whether those gains transfer to actual cognitive tasks in your life is the million-dollar question, and decades of research keeps answering: probably not.

When you train on Lumosity games, you are optimizing for Lumosity games. Whether those gains transfer to actual cognitive tasks is the million-dollar question.

This matters because people spend real money and real time chasing interventions that do not work. Meanwhile, the one intervention with strong evidence, formal education, is often dismissed as "just credentials." The research says otherwise.

Let me walk you through what we actually know, starting with the intervention that works and then moving through the interventions that do not.

Education: The One Thing That Actually Works

In 2018, Stuart Ritchie and Elliot Tucker-Drob published a meta-analysis in Psychological Science that analyzed 42 studies with over 600,000 participants. Their finding was unambiguous:

This is the strongest evidence in the entire IQ improvement literature. Not because the effect is huge (1-5 points per year is meaningful but not transformative), but because the study designs were rigorous enough to establish causation, not just correlation.

The researchers used natural experiments: situations where some children received more education than similar children due to policy changes rather than personal choice. When a country raises its mandatory schooling age, for example, you can compare children just above and below the cutoff. They have similar backgrounds and similar starting points, but different amounts of schooling. The children who received more education scored higher on IQ tests years later.

What does this mean practically? If you are in your 20s or early 30s and considering whether to pursue additional education, the cognitive benefits are real. They add to credential benefits and network benefits. An MBA, a graduate degree, or even structured continuing education courses provide measurable cognitive gains, particularly in crystallized intelligence.

For a deeper understanding of how education affects different types of intelligence, see our guide on Fluid vs. Crystallized Intelligence: A Career-Stage Strategy Guide, which explains why these gains are mostly in crystallized measures and what that means for your career.

The Practice Effect: Real but Misunderstood

Here is something the testing industry does not always emphasize: taking an IQ test multiple times will raise your score, sometimes by 3-10 points.

This "practice effect" is real, but it reflects test-taking skill rather than cognitive improvement. You become familiar with question formats. Your anxiety decreases. Your time management improves. You recognize similar pattern types from previous exposures.

Is this "cheating"? Not really. Think of it this way: if test anxiety causes you to underperform by 8 points relative to your actual ability, then removing that anxiety through familiarity brings your score closer to your true level. You are not inflating your intelligence; you are removing a measurement artifact.

Practical application: If you are preparing for a cognitive assessment for employment (like pre-employment screening or graduate school admissions), taking practice tests is strategic. Our Quick IQ Test can serve this purpose while giving you useful baseline data. You are demonstrating your true potential by removing anxiety-based performance degradation.

The key distinction: test familiarity improves your ability to demonstrate existing intelligence. It does not create new intelligence.

What Does Not Work: The Evidence Against Brain Training

Now we arrive at the interventions people actually spend money on. The evidence here is not ambiguous. It is negative.

Commercial Brain Training Games

In 2014, seventy leading cognitive scientists from Stanford, MIT, and the Max Planck Institute signed a consensus statement. The language was unusually direct for academic scientists:

The pattern across studies is consistent. People who play Lumosity get better at Lumosity. People who play Elevate get better at Elevate. What they do not get better at is general cognitive function. The games are too narrow, and the skills do not transfer.

Why does this happen? IQ tests measure your ability to solve novel problems, patterns you have never seen before. When you train on a specific game, you are building expertise in that game's patterns. That expertise does not generalize because the whole point of IQ measurement is to test you on things you have not practiced.

The Lumosity fine: The FTC ordered Lumosity to pay $2 million in 2016 for "deceiving consumers with unfounded claims that Lumosity games can help users perform better at work and in school, and reduce or delay cognitive impairment associated with age and other serious health conditions."

That is a regulatory agency saying, in official language, that the marketing was not supported by evidence.

The Exception That Proves the Rule: Dual N-Back

One brain training intervention has shown some positive results: Dual N-Back training, a working memory exercise where you simultaneously track visual and auditory sequences.

A 2015 meta-analysis by Au and colleagues found approximately 3-4 IQ points of improvement. A 2017 analysis found "real training effects beyond placebo."

What makes Dual N-Back different? It directly targets working memory, which is a component of fluid intelligence. Other brain games target more peripheral skills.

My honest assessment: if you are going to try any brain training, Dual N-Back is the only type with scientific credibility. But set realistic expectations. We are talking about maybe 3-4 points if the positive studies are correct, with uncertain transfer to real-world cognitive tasks. That is not nothing, but it is far from the transformative claims you see in brain training marketing.

For our detailed analysis, see Dual N-Back Training: The Only Game That Might Actually Work.

Nootropics and "Smart Drugs"

Silicon Valley has embraced nootropic stacks, racetams, modafinil, and various supplements with supposed cognitive benefits. The research says: save your money.

The promise is seductive: take a pill, boost your brain. But the science consistently fails to support the marketing. Study after study shows these compounds either do nothing for healthy adults or produce effects too small to measure reliably. The gap between supplement claims and clinical evidence remains vast.

The evidence breakdown:

• Racetams (Piracetam, Aniracetam, etc.): No evidence for cognition enhancement in healthy people. Original studies were on elderly patients with dementia.
• Modafinil: Benefits only for sleep-deprived individuals. If you are well-rested, no cognitive benefit. And it is a prescription medication with side effect risks.
• Omega-3 Fatty Acids: Two systematic reviews found no cognition-enhancing effects in the general population.
• Choline supplements: A 2019 review found them "ineffective at improving any measure of cognitive performance" in healthy adults.

Dr. Barry Gordon, director of cognitive neurology at Johns Hopkins Medicine, summarized the field bluntly: "There is no strong evidence that any [memory-boosting] supplement improves memory in healthy people."

In 2019, the FDA and FTC issued warnings specifically about "marketing scams concerning nootropic products." When both the scientific and regulatory establishments agree that an entire product category is oversold, that is worth noting.

For a nuanced analysis of the limited evidence that does exist, see The Nootropic Report: Evidence-Based Supplements for Working Memory.

The Maintenance Strategies: Not Improvement, But Protection

Several interventions do not increase IQ but may protect existing cognitive function. That distinction matters.

Physical Exercise

A 2019 meta-analysis found aerobic exercise benefits cognition, particularly in adults over 50. The mechanism involves Brain-Derived Neurotrophic Factor (BDNF), which supports neuroplasticity.

But "supports cognition" is not the same as "increases IQ." The evidence suggests exercise prevents decline rather than building new capacity. Someone who exercises regularly at 50 maintains cognitive function better than their sedentary self would have, but probably not better than their 25-year-old self.

Practical application: 150 minutes of moderate aerobic exercise per week is the standard recommendation. Frame this as cognitive maintenance, not cognitive enhancement. For demanding careers, see High-IQ Burnout in Middle Management: The Cognitive Overload Crisis.

Sleep Optimization

Sleep deprivation temporarily reduces cognitive performance by 10-15%. Optimizing sleep restores you to baseline. It does not create new cognitive capacity.

This matters for test performance. Taking an IQ test after poor sleep will produce an artificially low score. Ensuring adequate sleep before high-stakes assessments is not "boosting" your IQ; it is removing a measurement artifact that would cause underperformance.

For detailed sleep strategies, see Deep Work vs. Brain Fog: Optimizing Your Circadian Rhythm for Focus.

The Heritability Question: How Much Is Actually Possible?

Understanding improvement potential requires confronting an uncomfortable finding: IQ is substantially heritable, and heritability increases with age.

Current scientific consensus on heritability:

• Childhood: 20-40% of IQ variance is genetic
• Adolescence: 40-60% of IQ variance is genetic
• Adulthood: 60-80% of IQ variance is genetic

Why does heritability increase with age? Because environmental differences "wash out" over time. Children have highly variable environments (some get excellent schools, some get poor ones). Adults increasingly select environments that match their genetic predispositions. You gravitate toward work that fits your cognitive profile, friends who think like you, hobbies that play to your strengths.

What this means practically: If your biological family averages around 115, you are unlikely to reach 145 regardless of interventions. Your genetic potential sets a ceiling. The question is whether you are currently performing below that ceiling due to suboptimal conditions (sleep, nutrition, anxiety, test unfamiliarity) or whether you are already near your potential.

This is not defeatism. It is realism that prevents wasted effort on impossible goals. High performers focus on optimizing within their constraints, not pursuing impossible transformations.

The Flynn Effect: Evidence That Environment Matters

If IQ were purely genetic, scores would not change across generations. But they do.

The Flynn Effect refers to the well-documented finding that IQ scores rose approximately 3 points per decade throughout the 20th century. This proves environment matters significantly at the population level.

Proposed explanations: Improved nutrition, reduced exposure to lead and toxins, more years of education, more complex cognitive environments (technology, media), and better test-taking familiarity.

Recent updates: Research suggests the Flynn Effect may be slowing or reversing in some developed nations. The easy environmental gains may have been captured. This reinforces that individual improvement is harder than population-level improvement through public health and education policy.

The Bottom Line: What You Can Actually Control

After reviewing decades of research, here is the honest summary:

The strategic reframe: Stop asking "how do I increase my IQ?" and start asking "how do I optimize within my cognitive profile?" Your underlying intelligence is largely what it is. The question is whether you are currently performing below your potential (addressable through sleep, test familiarity, anxiety management, and education) or at your potential (in which case interventions will not help). Before investing in optimization strategies, check your brain age first to see how your cognitive speed compares to your age group and establish a useful baseline.

For career applications of your cognitive profile, regardless of whether it changes, see our guide on matching your intelligence type to career stage: Fluid vs. Crystallized Intelligence: A Career-Stage Strategy Guide.

Your Next Step: Know Your Baseline

Before optimizing, you need accurate data. Taking a comprehensive IQ assessment gives you the baseline metrics necessary for strategic planning.

Understanding your specific cognitive profile, whether your strengths lie in verbal reasoning, spatial visualization, or processing speed, allows you to stop pursuing generic "brain enhancement" and start using what you already have.

Your brain is your primary career asset. Stop trying to transform it. Start learning what it can already do.

References and Further Reading

• Ritchie, S. J., & Tucker-Drob, E. M. (2018). How Much Does Education Improve Intelligence? A Meta-Analysis. Psychological Science.
• Au, J., Sheehan, E., Tsai, N., Duncan, G. J., Buschkuehl, M., & Jaeggi, S. M. (2015). Improving fluid intelligence with training on working memory: a meta-analysis. Psychonomic Bulletin & Review.
• Stanford Center on Longevity & Max Planck Institute (2014). A Consensus on the Brain Training Industry from the Scientific Community.
• Hausknecht, J. P., Halpert, J. A., Di Paolo, N. T., & Moriarty Gerrard, M. O. (2007). Retesting in Selection: A Meta-Analysis of Coaching and Practice Effects. Journal of Applied Psychology.
• Nature Reviews Neuroscience. (2016). The heritability of intelligence.

Photos by Andrea Piacquadio, Google DeepMind, Tirachard Kumtanom, Foden Nguyen, and Artem Podrez