East Asian IQ Scores: What Does the Research Actually Show?
Headlines often turn East Asia into a single IQ number. The actual studies are more interesting: Japan, South Korea, Taiwan, and China do not produce one uniform score, and the pattern changes depending on the test, age group, and generation.
Recent comparative evidence does not support a simple claim that East Asians share one unusually high IQ. Some East Asian samples perform strongly on particular cognitive measures, especially visual-spatial reasoning and processing-speed tasks. But representative and standardized studies also find overall scores close to Western comparison samples, sizeable differences between cognitive domains, and large shifts between younger and older cohorts.
That is why Cognitive Train's average IQ by country table should be read as a dataset comparison, not as a biological ranking of populations.
A Recent Direct Comparison Finds Profiles, Not One “East Asian IQ”
A useful starting point is a 2024 special series in Archives of Clinical Neuropsychology comparing WAIS-IV performance in Japan, South Korea, Taiwan, India, and Indonesia with U.S. norms. The summary of the five-country series reported a recurring pattern specifically in the three East Asian samples: Japan, South Korea, and Taiwan showed weaker Verbal Comprehension scores and stronger Processing Speed scores than the U.S. comparison, with age moderating the processing-speed advantage. They also tended to perform better on Perceptual Reasoning relative to their own Verbal Comprehension scores.
That is not the same as finding a uniformly higher Full Scale IQ. It means the shape of performance differed across domains.
South Korea: Younger Adults Look Very Different From Older Adults
The South Korean paper from that same 2024 series is especially revealing. In the Korean-U.S. WAIS-IV comparison, the combined Korean sample scored lower on several verbal subtests and on the Verbal Comprehension Index. But younger South Koreans scored higher than their U.S. counterparts on a long list of visual-spatial, working-memory, arithmetic, and processing-speed tasks, and on every composite except Verbal Comprehension.
Older South Korean cohorts showed the opposite pattern on several measures. Education was highly correlated with all subtest and composite scores. A statement such as “South Korean IQ is X” therefore erases one of the study's main findings: age cohort changes the comparison substantially.
Taiwan: Mean Full Scale IQ Was Close to the U.S. Sample
Taiwan gives another useful reality check. A 2024 Taiwanese-U.S. WAIS-IV comparison found that mean Full Scale IQ closely aligned with the U.S. sample rather than sitting dramatically above it.
Again, the profile underneath the total score was more interesting. Younger Taiwanese cohorts performed strongly on Processing Speed, Working Memory, Perceptual Reasoning, and Full Scale IQ, while older cohorts scored lower than their U.S. counterparts in several domains. The differences were strongly related to educational disparities between the Taiwanese and U.S. cohorts.
This is a much more precise result than the familiar claim that Taiwan simply has an average IQ of 106, 108, or 110. Those exact national figures depend on which source is being used.
Japan Shows the Same Problem With a Single Headline Number
The Japanese study in the 2024 series also found a distinctive profile. Japanese WAIS-IV performance was lower than the U.S. comparison on verbal-comprehension tasks but stronger on processing-speed and perceptual-reasoning tasks. Most score differences were associated with differences in educational attainment between Japanese and U.S. age cohorts.
Older research has sometimes produced high Japanese estimates from Raven's Progressive Matrices. But Raven's is primarily a nonverbal matrix-reasoning test. It does not measure the same mix of abilities as a full Wechsler battery. A high Raven result should therefore not be silently relabeled as a full-scale national IQ.
China Shows How Much the Sample Can Matter
China is too large and internally varied for one school or one wealthy region to stand in for the entire country. A 2020 study of 6,970 children and adolescents in eastern China used Raven's Progressive Matrices and found meaningful variation even within that sample. Day students, for example, had an advantage of roughly 2–4 transformed IQ points over boarding students at some ages.
Other work has found much lower cognitive scores in disadvantaged rural Chinese samples. That within-country spread is exactly why a national average should not be treated as though every resident clusters near it.
Scores Also Change Across Generations
A particularly important Chinese finding comes from children tested roughly a quarter-century apart. A study comparing 12-year-olds tested in 1985–1986 with a later cohort tested in 2011–2012 found a 6.19-point increase in Full Scale IQ. Performance IQ rose more than Verbal IQ.
That is a large movement within the same country over a short historical period. It is another reason the question “What is the East Asian IQ?” is poorly formed. The answer depends partly on when people were tested.
What About the Famous 105–110 East Asian IQ Figures?
Those figures usually come from national-IQ compilations that combine results from different studies, tests, years, and samples. Some underlying studies are strong; others are narrow, old, or based mainly on nonverbal matrices. The resulting country number can be useful as a rough comparison, but its apparent precision is misleading.
A 2025 review of the literature concluded that representative East Asian IQ studies are generally much closer to Western population scores than the popular stereotype suggests. It noted that especially high estimates for Japan and Taiwan often came from Raven-based or less representative samples, while later or broader evidence produced smaller differences.
This also explains why different sources disagree about which country has the highest average IQ. The ranking changes when the evidence base changes.
PISA Is Relevant, but It Is Not an IQ Score
Japan, South Korea, Taiwan, Hong Kong, and parts of China have also produced very high results on international academic assessments. Those scores matter when studying cognitive performance, but PISA measures mathematics, reading, and science proficiency after years of schooling. It should not be converted directly into “IQ.”
The distinction is important enough that the separate article on why country IQ averages differ treats education, culture, sampling, and test design as different influences rather than one explanation.
What Does the Research Support?
Some East Asian samples do show high performance, but there is no single fixed East Asian IQ score. Recent Wechsler comparisons show strong processing-speed and perceptual-reasoning performance in several East Asian cohorts, alongside weaker verbal-comprehension performance. Taiwan's overall Full Scale IQ was close to the U.S. comparison. South Korean and Taiwanese results changed sharply by age cohort. Chinese scores vary within the country and have shifted substantially across generations.
That is also why the cause cannot be inferred from the score alone. Cognitive Train's guide to cultural bias in IQ tests explains cross-cultural measurement issues, while Is IQ Genetic or Learned? covers the much broader genetics-and-environment question.
Check Your Own Approximate IQ
A regional average cannot predict one person's result. If you want to sample your own verbal, logical, numerical, and visual-spatial reasoning, Cognitive Train's free IQ-Style Test gives a non-clinical, approximate estimate based on your performance on the test itself.
For narrower measures of reasoning, memory, attention, and processing speed, browse Cognitive Train's brain tests and cognitive assessments.
The Bottom Line
East Asian cognitive-test performance is a real research topic, but the evidence is badly summarized by one number. Japan, South Korea, Taiwan, and China differ from one another; different abilities show different patterns; and scores shift across age groups, samples, and generations.
The safest interpretation is therefore specific: name the country, the test, the sample, and the year. For the wider context, see what an average IQ score means, browse the Intelligence & IQ collection, or explore Cognitive Train's brain training and cognitive training tools.