Do Eye Color, Height, Blood Type, Music, or Gaming Affect IQ?

Is height related to IQ?

Research often finds a small positive population-level association between height and general cognitive ability, but height does not determine an individual’s IQ. Longitudinal Scottish data found modest correlations between childhood height and later cognitive ability. A twin MRI study reported a height–general cognitive ability association mediated partly by cortical size. These are observational results, not evidence that becoming taller raises IQ.

Height reflects many early-life influences, including nutrition, illness, prenatal conditions, social environment, and genetics. Those influences can also affect brain development and access to learning. The association is therefore compatible with shared developmental causes and selection, rather than a direct “tall people are smarter” mechanism.

Never use height to screen, stereotype, or set expectations for a child. Developmental history and a properly administered assessment are much more informative.

Does blood type affect intelligence?

No blood type has a scientifically established “highest IQ.” ABO blood groups are inherited antigens, not cognitive test scores. Earlier reports of links between blood group and intelligence were vulnerable to small samples and population stratification. A modern cross-sectional study of 200 participants found no significant relationship between ABO group and IQ level, although small studies cannot settle every biological question.

Some research has examined blood group and later cognitive impairment or vascular risk, which is a different outcome from general intelligence in healthy people. A large Scandinavian record-linkage study found no association between ABO group and Alzheimer’s disease, vascular dementia, or unspecified dementia overall. A US cohort reported an association between AB group and incident cognitive impairment, but that result concerns disease risk, not an IQ ranking, and requires careful clinical interpretation.

Does listening to music or learning an instrument raise IQ?

Music and cognition overlap, but music lessons do not guarantee a general IQ increase. Musical aptitude tests measure pitch, rhythm, melody, or auditory pattern processing; IQ tests use a wider set of normed tasks. People who choose sustained music training may differ beforehand in family support, motivation, attention, or prior achievement.

A multilevel meta-analysis of music training in children found a small overall effect, but effects were near zero in studies using active controls or random assignment. A separate review of far transfer concluded that improvements tend to remain close to the trained skill. Music education can still be valuable for enjoyment, cultural participation, auditory expertise, persistence, collaboration, and identity without promising a fixed number of IQ points.

The fair claim is task-specific development is plausible; automatic general-intelligence transfer is not established. If a child enjoys music, choose instruction for musical and personal goals, not as a guaranteed IQ intervention.

Related

Average Musical IQ: What Musical Intelligence Does—and Does Not—Measure

There is no single musical IQ score. Musical aptitude, music perception, and general intelligence overlap modestly but measure different abilities, and training does not guarantee a higher IQ.

Does playing video games affect IQ?

Video-game play can relate to cognitive performance, but the effect depends on the game, the task, the player, and the study design. A 2023 meta-analysis of 63 video-game training studies (118 investigations, 2,079 participants) found a moderate overall training effect after analysis, while also detecting publication bias and substantial heterogeneity. The authors found that gameplay features—not broad genre labels alone—helped explain which outcomes changed.

This does not mean that any game raises a person’s full-scale IQ. Training may improve attention, visual search, spatial processing, or a practiced strategy. Transfer to unrelated reasoning, school achievement, or everyday judgment is less certain. Observational comparisons of “gamers” and “non-gamers” are especially difficult because age, sleep, personality, prior ability, social context, and the amount and type of play differ.

Use games as recreation or as a targeted training tool with realistic expectations. A good study reports an active control group, preregistered outcomes, follow-up testing, and the exact cognitive measure. A viral claim that “gamers have higher IQ” does not supply that evidence.

Why do these traits appear in IQ rankings?

They are easy to observe and easy to sort into categories. That makes them attractive for online quizzes, but it also creates several statistical traps:

1. Selection bias: People who volunteer for an IQ or gaming survey are not a random population sample.
2. Confounding: Education, health, income, language, nutrition, age, and access to technology affect both the trait and the test result.
3. Multiple comparisons: If dozens of traits are tested, one may appear significant by chance.
4. Measurement mismatch: A reaction-time task, a school grade, and a full-scale IQ are not interchangeable outcomes.
5. Publication bias: Positive findings are more likely to be published or shared than null results.
6. Ecological fallacy: A group average cannot predict where a particular individual will score.

The remedy is not to ignore research. It is to ask which people were studied, what was measured, how large the effect was, and whether the finding was replicated with controls.

What should you use to understand your own IQ?

If you want an estimate of cognitive ability, use an age-appropriate, properly normed assessment administered under standardized conditions. Review the instrument, confidence interval, index scores, language, accommodations, and reason for testing. An online quiz can be entertainment, but it should not be used for diagnosis, educational placement, or life-changing decisions.

Physical traits and hobbies can be part of a person’s story without being cognitive labels. Height is not destiny, blood type is not aptitude, eye color is not a test, music is not a second IQ scale, and gaming is not a guaranteed intelligence supplement. Skills grow through learning, practice, health, opportunity, and support—none of which can be reduced to a color or category.

Q: Which eye color has the highest average IQ?

A: None has a scientifically established highest average IQ. Eye color is not a validated proxy for reasoning, memory, or processing speed, and online rankings do not provide adequate controls or representative samples.

Q: Are taller people smarter?

A: Height and cognitive ability show a modest association in some cohorts, but the distributions overlap extensively. Shared early-life, genetic, and social factors can contribute; height cannot predict an individual IQ score.

Q: Which blood type has the highest IQ?

A: No ABO blood type has a reliable highest-IQ ranking. Blood group studies of health outcomes are not the same as a validated measure of general intelligence.

Q: Does listening to classical music raise IQ?

A: Listening alone is not a proven way to raise general IQ. Music can support enjoyment and auditory skills, while controlled training studies show small or near-zero far-transfer effects depending on design.

Q: Do gamers have higher IQs?

A: Some game training can improve selected cognitive tasks, but gamers do not share one IQ level. Game type, practice, prior ability, age, sleep, and study design all matter, and transfer to full-scale IQ is not guaranteed.

References

• Brain structure mediates the association between height and cognitive ability
• Associations among height, body mass index and intelligence from age 11 to age 78 years
• ABO Blood Group and Dementia Risk: A Scandinavian Record-Linkage Study
• Cognitive and academic benefits of music training with children: a multilevel meta-analysis
• A game-factors approach to cognitive benefits from video-game training: a meta-analysis

Last updated: July 19, 2026