Highly Sensitive Person and IQ: Are HSPs More Intelligent?

Being a highly sensitive person is not linked to higher intelligence: in a representative sample of 405 German adults, scores on the Highly Sensitive Person Scale correlated only about r = .07 to .08 with tests of reasoning and knowledge, roughly one IQ point per standard deviation of sensitivity, and the correlations were not statistically significant. The evidence is thin, since that is the only representative-sample result I could find and it was presented at a scientific conference instead of being published as a full paper, but nothing in the wider research on sensitivity and giftedness points the other way.

This article explains what researchers mean by a highly sensitive person, what the studies of sensitivity and intelligence show, how the trait overlaps with personality, where the idea of the sensitive genius comes from and what sensitivity does seem to predict.

"Highly sensitive person" (HSP) is the popular name for a research trait called "sensory processing sensitivity." Psychologists Elaine Aron and Arthur Aron introduced it in 1997 in a series of seven studies, describing people who process experiences deeply and become overwhelmed more easily in busy or intense settings. They built the 27-item Highly Sensitive Person Scale and showed that sensitivity is partly independent of social introversion and "emotionality" (a tendency toward negative emotions), the traits it had usually been lumped in with. How it differs from being an introvert is covered in our article on introversion and IQ.

Sensitivity is not a diagnosis, and it is continuously distributed like height. Statistical analyses do suggest that people fall into rough groups along it:

• Adults: Francesca Lionetti and colleagues analysed HSP Scale answers from 906 adults and found three groups, a highly sensitive group (31%), a medium group (40%) and a low-sensitive group (29%).

• Children: Michael Pluess and colleagues developed a 12-item Highly Sensitive Child Scale across samples totalling 3,581 children and adolescents aged 8 to 19 and found a similar split, with about 20% to 35% in the high group.

• Heritability: in a study of 2,868 adolescent twins, Elham Assary and colleagues estimated that genes explain about 47% of the differences between people in sensitivity.

The most direct test comes from Tanja Gabriele Baudson and colleagues, who presented their results at the 2017 meeting of the International Society for Intelligence Research. Their 405 adults, aged 18 to 70, completed a German version of the HSP Scale, a speeded reasoning test (the mini-q) and a test of general knowledge, a measure of "crystallized intelligence" (knowledge and skills built up through learning). The correlations were r = .079 with reasoning and r = .068 with knowledge, both non-significant. Squaring them shows that sensitivity accounted for less than 1% of the differences in scores. Multiplying by 15, the standard deviation of IQ, gives about 1 point.

The authors suggested that the belief in a connection may come from selective samples, such as gifted people who seek counselling. That fits a 2026 systematic review by Gabrielle Pouilloux and colleagues. Out of 739 articles screened, only 5 studies met their standards for examining sensory processing in people with high intellectual ability, and the review concluded that the literature does not support the idea that highly intelligent people show extreme sensory processing.

A 2018 study by Anne Rinn and colleagues gave the HSP Scale to 188 high-ability adults. It showed that the scale measures something coherent in that group, which is a different question from whether high-ability people score higher on it.

A good way to predict how sensitivity should relate to IQ is to look at the personality traits it overlaps with. In a meta-analysis of 8 papers with 6,790 participants, Lionetti and colleagues found that in adults, sensitivity correlated r = .40 with "neuroticism," the tendency to experience negative emotions, and r = .14 with "openness to experience," an interest in ideas and new experiences. In a second analysis of 19 papers, it correlated r = .34 with negative mood in adults. In children, the link with neuroticism was similar (r = .42) and the link with openness was absent.

Those two traits pull in opposite directions on intelligence. A meta-analysis of 162,636 people by Jeromy Anglim and colleagues found that openness was the strongest positive personality correlate of intelligence (about .20) and neuroticism a weak negative one (about -.09). A trait that carries a dose of each would be expected to land close to zero, which is what the 2017 data found.

The overlap with neuroticism also matters for sensory complaints. Being bothered by loud noises and bright lights is part of the scale's "low sensory threshold" subscale, and the research on noise sensitivity and intelligence is covered in our article on noise and IQ.

The belief that bright people are unusually sensitive is old. The Baudson abstract traces it back to Francis Galton in 1883, and it was revived in gifted education through the Polish psychiatrist Kazimierz Dabrowski's idea of "overexcitabilities," intense responses in five areas: psychomotor, sensual, imaginational, intellectual and emotional.

The best test of that idea is a meta-analysis by Paula Olszewski-Kubilius and colleagues, published in Gifted Child Quarterly, which pooled 230 effects from 20 studies. Gifted groups did score higher on overexcitability overall, mostly on the intellectual type and least on the sensual and emotional types. The result depended heavily on how giftedness was defined:

• Previously identified as gifted: the difference was largest when "gifted" meant people already identified as gifted.

• Measured intelligence: the difference disappeared when giftedness was defined by scores on tests of general intelligence or cognitive ability.

The authors also found signs of publication bias, with small studies over-represented, and advised against using overexcitabilities to identify gifted students. That pattern is what you would expect if the link runs through how people come to be labelled gifted, which often involves more than a test score, and through the samples clinicians see. Intellectual overexcitability questionnaires also ask about a love of ideas, which sounds close to openness. Popular books on high sensitivity reach a large audience that finds the description flattering, and flattering claims travel well.

Where the research on sensitivity is more interesting is in how people respond to their surroundings. The "orchids and dandelions" idea, part of a theory called "differential susceptibility," holds that sensitive people are more affected by both bad and good environments. A review by Bernadette de Villiers, Lionetti and Pluess describes two school studies. In a programme designed to prevent depression in adolescents, students low in sensitivity showed no improvement while those high in sensitivity showed substantial reductions in depressive symptoms through to the 12-month follow-up. In a randomized trial of an anti-bullying programme with 2,024 children, the benefits were driven by the more sensitive children. These are effects on mood and behaviour, none of these studies measured intelligence, and the findings need more replication.

Highly sensitive people are not a clinical group, but intense sensitivity to sound or touch can also be part of autism or an anxiety disorder. If sensitivity is making daily life hard, a family doctor or a licensed psychologist can help work out what is going on.

Not on average. In the one representative adult study, HSP Scale scores correlated about .07 to .08 with reasoning and knowledge tests, roughly one IQ point per standard deviation, which was not statistically significant.

The evidence is weak. A 2026 systematic review found no consistent sign of extreme sensory processing in people with high intellectual ability, and a meta-analysis found that gifted-nongifted differences in overexcitability vanished when giftedness was defined by intelligence test scores.

No. Aron and Aron found the two only partly overlap, and a later meta-analysis found that in adults sensitivity correlated with neuroticism (about r = .40) but not with extraversion.

Studies using latent group analysis put about 20% to 35% of children and adolescents, and about 31% of adults, in the high-sensitivity group. The trait itself is continuous, so these cut-offs are approximate.

Partly. A twin study of 2,868 adolescents estimated that genes explain about 47% of individual differences in sensitivity, with the rest due to environment and measurement error.

Being a highly sensitive person is a real, measurable personality trait, and there is no good evidence that it marks intelligence. Sensitivity overlaps with neuroticism and a little with openness, and the only representative study of sensitivity and IQ found a correlation close to zero. If you want to know where your reasoning ability stands, rather than inferring it from how strongly you react to the world, try a professionally developed IQ test.

1. Aron, E. N., & Aron, A. (1997). Sensory-processing sensitivity and its relation to introversion and emotionality. Journal of Personality and Social Psychology, 73(2), 345-368. [doi.org/10.1037/0022-3514.73.2.345](. doi.org

2. Lionetti, F., Aron, A., Aron, E. N., Burns, G. L., Jagiellowicz, J., & Pluess, M. (2018). Dandelions, tulips and orchids: Evidence for the existence of low-sensitive, medium-sensitive and high-sensitive individuals. Translational Psychiatry, 8, 24. [doi.org/10.1038/s41398-017-0090-6](. doi.org

3. Pluess, M., Assary, E., Lionetti, F., Lester, K. J., Krapohl, E., Aron, E. N., & Aron, A. (2018). Environmental sensitivity in children: Development of the Highly Sensitive Child Scale and identification of sensitivity groups. Developmental Psychology, 54(1), 51-70. [doi.org/10.1037/dev0000406](. doi.org

4. Assary, E., Zavos, H. M. S., Krapohl, E., Keers, R., & Pluess, M. (2021). Genetic architecture of Environmental Sensitivity reflects multiple heritable components: A twin study with adolescents. Molecular Psychiatry, 26(9), 4896-4904. [doi.org/10.1038/s41380-020-0783-8](. doi.org

5. Baudson, T. G., Kemper, C., Becker, N., Greiff, S., & Spinath, F. M. (2017, July). Intelligence and sensory processing sensitivity: What is the relationship? Paper presented at the 17th Annual Meeting of the International Society for Intelligence Research, Montreal, Canada. [programme.exordo.com/isir2017](. programme.exordo.com

6. Pouilloux, G., Sido, H., Polin, C., & Paquet, A. (2026). Extreme sensory processing in high intellectual potential individuals: A systematic review. BMC Psychology, 14, 1243. [doi.org/10.1186/s40359-026-04958-9](. doi.org

7. Rinn, A. N., Mullet, D. R., Jett, N., & Nyikos, T. (2018). Sensory processing sensitivity among high-ability individuals: A psychometric evaluation of the Highly Sensitive Person Scale. Roeper Review, 40(3), 166-175. [doi.org/10.1080/02783193.2018.1466840](. doi.org

8. Lionetti, F., Pastore, M., Moscardino, U., Nocentini, A., Pluess, K., & Pluess, M. (2019). Sensory processing sensitivity and its association with personality traits and affect: A meta-analysis. Journal of Research in Personality, 81, 138-152. [doi.org/10.1016/j.jrp.2019.05.013](. doi.org

9. Anglim, J., Dunlop, P. D., Wee, S., Horwood, S., Wood, J. K., & Marty, A. (2022). Personality and intelligence: A meta-analysis. Psychological Bulletin, 148(5-6), 301-336. [doi.org/10.1037/bul0000373](. doi.org

10. Olszewski-Kubilius, P., Steenbergen-Hu, S., Calvert, E., Richert Corwith, S., & Bright, S. (2026). A meta-analysis of research on the relationship between overexcitabilities and giftedness. Gifted Child Quarterly, 70(2), 111-138. [doi.org/10.1177/00169862251370377](. doi.org

11. de Villiers, B., Lionetti, F., & Pluess, M. (2018). Vantage sensitivity: A framework for individual differences in response to psychological intervention. Social Psychiatry and Psychiatric Epidemiology, 53(6), 545-554. [doi.org/10.1007/s00127-017-1471-0](. doi.org

Hero image: Mimosa pudica 04215, by Vengolis, CC BY-SA 4.0. Via Wikimedia Commons.