Cognitive & Thinking Style
Personality & Traits
Physical Body Correlates
Lifestyle Patterns
Key SectionThe paradox in plain language: Higher-IQ individuals are more likely to drink alcohol at all, but when they drink, they drink less problematically. Lower-IQ individuals who drink are more likely to binge. The U-shaped relationship means very high and very low IQ groups drink the most total alcohol — for opposite reasons (exploration vs. coping).
Mendelian randomization studies support genuine causality here: genetically proxied intelligence reduces smoking likelihood and increases cessation. Brothers who smoke score lower IQ than their non-smoking brothers — controlling for family environment.
Sleep & Chronotype
Health, Longevity & Mental Health
Environmental & Causal Factors
Causal EvidenceLead Exposure — Most Preventable IQ Suppressor
Effect size: Blood lead from 2.4→10 μg/dL: −3.9 IQ points. From 10→20: −1.9 pts. The dose-response curve is steepest at low doses — there is no safe threshold.
Mechanism: Lead crosses the blood-brain barrier, damages hippocampal neurons, disrupts synaptic function. Children absorb 4–5× more lead than adults from the same source.
Policy relevance: Removal of leaded gasoline correlated with measurable IQ gains and crime rate reductions in subsequent generations. Lead remains in soil near major roads and in older housing paint. Disproportionately affects low-income and minority neighborhoods.
Iodine — Largest Single Modifiable IQ Factor Globally
Effect size: Severe deficiency: up to −15 IQ points. Mild maternal deficiency: reduced reading ability and IQ at age 6.
Mechanism: Iodine → thyroid hormones → brain development. First trimester is most critical. The fetal brain is entirely dependent on maternal thyroid hormone supply during early development.
Historical experiment: US iodization of salt in the 1920s caused measurable IQ gains in previously-deficient regions; iodine-sufficient regions showed no change — a clean natural experiment for causality.
Modern risk: Sea salt, artisanal salt, and reduced table salt use have quietly reduced iodine intake in developed countries. ~50% of women of childbearing age may be mildly deficient.
Nutrition & Micronutrients
Hobbies & Interests
Music Preferences
The key variable is vocal vs. instrumental, not genre complexity. Preference for instrumental music (classical, jazz, ambient, film scores, smooth jazz) predicts higher IQ. Liking vocal music has no IQ association — many high-IQ people enjoy vocal music too. The signal is in the preference for purely instrumental pieces.
The Kanazawa/Savanna Theory explanation: instrumental music is evolutionarily novel — all ancestral music was vocal. Preferring a non-vocal form requires overriding evolved defaults, which high-IQ individuals do more readily across many domains.
Higher-IQ individuals also use music differently — as cognitive background rather than emotional regulation. Neurotic and non-conscientious individuals use music primarily for emotional self-regulation regardless of IQ.
Opera (cognitively complex, vocal) shows no IQ correlation — undermining the "complexity" theory. This confirms the vocal/instrumental split, not complexity, is the operative variable. Progressive metal, jazz-fusion, math-rock show positive associations in anecdotal data. Individual variation is massive — IQ is a poor predictor of any specific person's music taste.
Politics, Beliefs & Values
Qualitative Observations & Anecdotal Clusters
AnecdotalHigh-IQ individuals consistently report that simple decisions — what to eat, whether to reply to a message — become cognitively expensive. The more options you can model, the harder it is to commit. This is option paralysis applied to everyday life. The cost-benefit analysis never terminates cleanly.
Teachers, therapists, and managers consistently observe that high-IQ individuals process content faster than emotional tempo. They resolve the intellectual puzzle before the person has finished wanting to be heard. The effect looks like coldness or dismissiveness but is actually processing speed mismatch.
Very high-IQ individuals describe boredom not as mild irritation but as physically aversive — almost painful. A nervous system tuned for high cognitive throughput experiences low-stimulus environments as genuine deprivation. Consistent with the Dabrowskian overexcitability framework.
High-IQ individuals often have excellent semantic memory (facts, patterns, arguments) but weaker autobiographical memory (when things happened, what people said). Processing at high abstraction extracts principles rather than encoding episodes. They remember the insight but not the conversation that produced it.
Teachers of gifted children consistently report questions that seem random or off-topic — but are actually 3–5 logical steps ahead of where the lesson is. The child has processed the intermediate steps internally and is asking from a different position. Often misread as inattention.
High-IQ individuals update well from evidence but poorly from social pressure. This is sometimes adaptive (intellectual independence) and sometimes catastrophic (being correct while making collaboration impossible). The failure mode is holding a correct position in a way that destroys the relationship.
Charlton (2009) documented the tendency of highly intelligent people to remain in a state of perpetual novelty-seeking adolescence — declining to settle into conventional adult roles, conventional values, or conventional thinking. A form of sustained openness that can look like arrested development.
Longitudinal observers note that children identified as gifted often feel their adult lives don't match the implicit promise. The gifted label creates an expectation of exceptional contribution that most lives — even successful ones — don't fulfill. This specific dissatisfaction has been called "bright line depression."
Gifted children commonly show advanced reasoning in one moment and emotional responses appropriate to their calendar age (not mental age) in the next. Parents and teachers who expect cognitive age to predict emotional age consistently misread these children. The two tracks develop at different rates.
Financial fraud investigators and con artists consistently note that high-IQ, high-income individuals are disproportionately targeted — and caught. They engage with complex pitches that low-IQ individuals simply ignore, and their confidence in their own analytical ability creates a blind spot for emotional manipulation.
One of the most consistent self-reports among very high-IQ adults: the specific loneliness of rarely meeting people who can match their processing pace. It's not that they dislike ordinary people — it's that conversation at a different cognitive register is chronically unsatisfying in the way that running at half speed is physically unsatisfying.
High-IQ individuals often bury themselves in work — not because of external pressure but because work is one of the few socially acceptable venues for sustained cognitive engagement. Japan (high average IQ) has among the highest annual work hours globally. The work fills the bandwidth that other environments can't.
Taboo, Contested & Fringe Findings
SensitiveGiftedness — The Label Problem
What is real: The upper tail of cognitive ability exists, is measurable, and produces genuine developmental consequences. Children at the extreme upper end process information faster, form more complex abstractions, and experience conventional educational environments as genuinely under-stimulating — not as a preference but as a functional mismatch.
What is constructed: The category boundary (IQ 130, top 2%) is entirely arbitrary. There is no discontinuity in the distribution at that point. A child at 128 and one at 132 are cognitively nearly identical. The cut-off is a policy decision masquerading as a biological fact.
The inflation problem: Giftedness definitions have expanded to include creativity, leadership, emotional sensitivity, and artistic talent — creating a category so broad it no longer carves nature at its joints. In practice, gifted programs systematically over-identify white, affluent children and under-identify poor and minority children with identical ability profiles.
Dabrowski's Overexcitabilities — real but misused: The five OEs (psychomotor, sensual, intellectual, imaginational, emotional) describe real phenomenological patterns but are probably better explained by existing personality dimensions (Openness + neuroticism) than by a separate gifted construct. They're useful descriptively; they're abused as identity markers.
Terman's Lesson: His 1,528 high-IQ children became above-average adults — healthier, wealthier, better-adjusted than average. But they did not produce genius. Two children he rejected as "not gifted enough" won Nobel Prizes. High IQ in childhood predicts a better-than-average life trajectory, not exceptional contribution.
The adult gifted identity: For many adults, "gifted" functions as an explanatory framework for alienation, underachievement, and social failure. This is sometimes accurate and sometimes a sophisticated avoidance of more actionable self-examination. The framework can close off: every difficulty becomes evidence of the burden of giftedness.
Meta-Findings & Structural Notes
IQ explains 20–30% of variance in most life outcomes — the other 70–80% is personality, circumstances, relationships, timing, and luck. It's consequential but not determinative.
System Integrity Hypothesis (Deary): IQ is a proxy for whole-organism biological quality. The correlates with walking speed, grip, lung capacity, longevity, and inflammation all express the same underlying variable: how cleanly the organism's systems operate.
The 2025 job performance bombshell: Steel & Fariborzi showed the classic 0.51–0.65 IQ–job performance correlations were inflated by overcorrection for range restriction. True correlation may be ~0.16. The entire psychometric hiring industry was built on numbers roughly 3× too large.
Gene-environment interplay: IQ is highly heritable AND highly malleable. These are not contradictory. Genes set potentials; environments determine expression. The same child with lead poisoning, iodine deficiency, and poverty versus adequate nutrition and stimulation can differ by 20+ IQ points.
Taleb's critique: In fat-tailed environments (entrepreneurship, creative fields, science), IQ's predictive value collapses. It predicts linear, reliable performance well; it predicts extreme outlier outcomes poorly. The correlation for winning a Nobel Prize is essentially random above ~120 IQ.
Vocational Interests & IQ (RIASEC)
What this means in plain language: Higher IQ individuals are drawn to Investigative environments — science, research, philosophy, analysis — and this is the strongest and most replicated interest-intelligence link. Artistic environments (writing, music, visual arts) show a secondary pull. Conventional environments (structured data processing, clerical work) show a mild negative pull. Social and Enterprising show essentially no IQ correlation — interpersonal skill and leadership appetite are orthogonal to g. Crucially, a 40-year longitudinal study showed that childhood Openness/Intellect predicted adult Investigative and Artistic occupations — and negatively predicted Conventional ones — independent of other personality traits.
The verbal asymmetry (2024): Verbal IQ predicts political orientation, civic engagement, and sociopolitical attitudes at twice the rate of performance IQ. This suggests that the social and ideological dimensions of intelligence are more linguistic than spatial — what you do with words shapes your worldview more than what you do with shapes.
Personality Facets — Below the Big Five
The key insight from Stanek & Ones (2023): Empathetic, happy, engaged, and compassionate people are more likely to be intelligent than their moody, insensitive counterparts — despite the "tortured genius" stereotype. The moody genius is a narrative artifact; the data points in the opposite direction. Agreeableness overall is weakly or uncorrelated with IQ, but its compassion facet is positively correlated and its politeness facet is negatively correlated — meaning intelligent people tend to care more about others' feelings but less about deferring to hierarchy or avoiding confrontation. This is a subtle but empirically robust split.
On Neuroticism: The overall correlation is weak and contested, but the uneven temper and depression facets specifically predict lower cognitive performance — undermining both the "emotional genius" trope and the idea that neuroticism is systematically intelligence-linked. High general neuroticism appears to interfere with optimal cognitive performance via test anxiety and rumination.
Social Impressions — How Others Read Intelligence
High-IQ individuals in group settings are frequently perceived as cold, arrogant, or dismissive — not because they are, but because their faster processing speed creates social asymmetry. They've resolved the problem while others are still framing it. The silence they offer is filled with other people's discomfort. Observers attribute the gap to attitude rather than tempo.
Multiple studies find that perceived intelligence — what people in a room think you are — correlates more with confidence and verbal frequency than with actual measured IQ. The person most likely to be seen as intelligent is the one who speaks first and often, not the one who eventually says the most accurate thing. High-IQ individuals who default to listening are consistently underestimated.
Research found that students labeled as "gifted" reported that the label made friendships with non-gifted peers harder — not because of ability gaps, but because the label itself created social distance. Being tagged as cognitively different activates in-group/out-group dynamics in children immediately and persistently.
High-IQ individuals consistently report discomfort with small talk — not from social anxiety but from mismatch in information density. Surface-level exchanges carry very little data, require significant social performance, and offer no learning. Observers read this avoidance as unfriendliness or social deficiency. It is functionally more like selective bandwidth management.
The social perception literature documents that highly intelligent individuals who become lonely — due to small peer networks and cognitive mismatch — are then further perceived as having social deficits that caused the isolation. The causality is inverted in most observers' minds. The isolation usually preceded the perceived deficiency, caused by environment, not vice versa.
Observers can gauge the real intelligence of men from facial photographs at slightly above-chance accuracy, but this does not replicate for women. The mechanism isn't facial morphology per se — symmetry and averageness correlate with perceived but not actual intelligence — it's something else being read (possibly microexpressions or gaze behavior during photo capture). Entirely absent in women.
Quirks, Habits & Lifestyle Patterns
Philosophical Character & Inner Life
One of the most consistent patterns in clinicians who work with high-IQ adults: they hold opinions as provisional, not permanent. When new information arrives, the update is fast and relatively frictionless — not emotionally painful in the way it is for average-IQ individuals. This can look like inconsistency to observers but is actually a form of epistemic hygiene. The flip side: they are sometimes perceived as untrustworthy or "wishy-washy."
Higher intelligence correlates with grappling with questions of meaning, mortality, and cosmic insignificance — not casually, but persistently and sometimes overwhelmingly. The capacity to hold the full frame of one's situation — the randomness of birth, the certainty of death, the scale of the universe relative to an individual life — produces a form of despair that is structurally different from clinical depression. It's described as a tax on awareness.
A consistent frustration across gifted adults: the gap between the richness of their inner engagement and the flatness of most institutional environments. Jobs, meetings, social gatherings, administrative tasks — designed for median engagement — feel not just boring but slightly insulting. The boredom is experienced as wasted capacity, which produces a specific kind of irritability distinct from simple displeasure.
High-IQ individuals often report a compulsion to qualify their own statements mid-sentence — to insert caveats, acknowledge exceptions, and undermine their own confident delivery before the listener even has a chance to challenge it. This is related to the "ideas facet" correlation with verbal intelligence: they see the flaws in their own reasoning faster than others do. Socially, this can come across as wishy-washy or neurotic. Epistemically, it's accurate modeling.
Many high-IQ adults describe their intellectual curiosity as the stable core of their identity — more fundamental than their career, their relationships, or their opinions. The drive to understand something new is experienced as intrinsically rewarding rather than instrumentally useful. This produces the "rabbit hole" pattern of deep, often economically irrelevant investigation. The value is the understanding, not the application.
One of the most widely reported subjective experiences of gifted adults: the gap between cognitive age and emotional/social age. They understood Kant at 14 but couldn't manage a rejection without catastrophizing until 30. The intelligence is precocious; the emotional equipment is not. This creates specific forms of suffering that don't fit neatly into either the "successful person" or "struggling person" categories — and that therapists and coaches who don't specialize in high-IQ profiles often completely misread.
The same cognitive machinery that allows high-IQ individuals to see connections across disparate domains also produces false positives — perceived patterns in noise, causal stories from correlations, narrative coherence imposed on random events. The very feature that makes them effective at finding real structure also makes them prone to finding structure where none exists. This is the mechanism behind the "intelligent conspiracy theorist" and the high-IQ investor who sees market patterns that don't exist.
Rather than spreading attention evenly across many interests, high-IQ individuals tend toward deep, sequential obsessions — intensely engaged in one domain for months or years, then switching. The switches can look inexplicable from outside. Inside, they're driven by the feeling that a problem has been "solved enough" — that the most interesting layer has been accessed and the remaining depth doesn't justify continued investment. The characteristic left in the wake is a library of half-explored domains, each of which most people would consider a lifetime's specialization.
Clinicians consistently describe high-IQ adults oscillating between two poles: the private certainty that their perspective is correct (even when they won't say so), and a crippling sense that they are frauds who have fooled everyone into thinking they're competent. The Dunning-Kruger effect partially explains this — the more you know, the more clearly you see the enormous territory you don't know. But it also reflects the mismatch between internal experience (constant doubt, processing cost) and external perception (effortless competence).
A recurring observation: very high-IQ individuals often resist demonstrating intelligence socially, not from modesty but from finding the performance exhausting and the social dynamics it creates unpleasant. Being the "smart one" creates social distance, invites testing behaviors, and attracts the wrong kind of attention. The performance of intelligence is not the same as the exercise of it, and many prefer the latter privately to the former publicly.
Higher IQ correlates with stronger justice sensitivity — a heightened emotional response to unfairness, not just to rules violations but to principle violations. This drives the activism, the moral argumentation, the inability to let injustice go unaddressed in a group setting. It also produces significant interpersonal friction, since the intensity of the moral response is calibrated to the principle, not to the social cost of expressing it.
Perhaps the most consistent phenomenological report from high-IQ adults across cultures: the inability to turn off the processing when they want to. Problems continue running in background. Solutions arrive mid-shower, mid-conversation, 2 AM while trying to sleep. This is not celebrated as genius — it's experienced as an intrusion. The brain's capacity to continue processing without permission is described as both their greatest asset and their most reliable source of suffering.
Rationality & Cognitive Biases
StanovichThe Core Paradox
High-IQ individuals are better at most reasoning tasks — they commit fewer logical errors, update more readily from evidence, and detect others' biases more accurately. But on myside bias specifically — the tendency to evaluate evidence in favor of your existing position — intelligence provides essentially zero protection. The correlation is near zero across multiple paradigms.
Worse: because high-IQ people are better arguers, they are better at constructing sophisticated justifications for positions they already hold. Intelligence becomes a tool for defending priors rather than correcting them. Stanovich calls this the "sophisticated arguer" effect. The practical implication: being smart does not make you fair-minded. It makes you a more effective advocate for whatever you already believe.
Financial & Economic Behavior
The Finnish military dataset (Grinblatt, Keloharju & Linnainmaa, 2011) is the gold standard here: ~160,000 males with IQ tested at military induction, matched to complete tax and investment records. Stock market participation increases monotonically with IQ — a 20+ percentage point gap between highest and lowest IQ stanines, persisting even among the top 10% wealthiest. High-IQ investors hold more diversified portfolios, pay lower fees, earn higher risk-adjusted returns, and showed better market timing around the dot-com bubble. The effect is not driven by income or wealth — IQ independently predicts financial behavior even among the affluent.
Cooperation & Strategic Interaction
Proto, Rustichini & Sofianos (2019, 2022) — Intelligence and Cooperation
In one of the cleanest experimental demonstrations in behavioral economics, Proto et al. separated participants into IQ-based groups and had them play repeated prisoner's dilemma games. Initial cooperation rates were similar across groups. But over time, high-IQ groups converged toward near-total cooperation, while low-IQ groups declined toward mutual defection.
The mechanism: higher-IQ players made fewer "trembling hand" implementation errors and had better working memory for tracking partner behavior. They adopted conditionally cooperative strategies (cooperate if partner cooperated last round) and stuck to them. Low-IQ players made more execution errors, causing reciprocal punishment spirals. When mixed together, high-IQ players became less lenient — correctly adjusting for the higher error rate of their partners. This has been replicated (2025 replication at 99% power confirmed all findings).
Biomarkers & Physiology
The pupil size controversy: Tsukahara, Harrison & Engle (2016) found that larger baseline pupil size correlates with higher fluid intelligence (r≈.30–.39 in extreme groups), proposed to reflect locus coeruleus-norepinephrine system regulation. However, multiple independent replication attempts have failed (Robison & Brewer, 2022; Unsworth et al., 2019). The original authors argue failures stem from methodological issues (lighting conditions compressing pupil variability). Status: genuinely contested, with the original team and critics both publishing spirited responses. Tag accordingly.
Language & Communication
Crime, Legal & Risk
Aging & Cognitive Reserve
The cognitive reserve paradox: Higher childhood IQ delays the visible onset of dementia by years — the brain has more functional capacity to lose before impairment becomes noticeable. But it does not protect against the underlying Alzheimer's pathology (same amyloid plaques, same tau tangles). The result: high-IQ individuals appear fine for longer, then sometimes decline more steeply once the reserve is exhausted. The clinical implication is that by the time a high-IQ person fails a cognitive screening test, their brain pathology may be more advanced than in a lower-IQ person who failed the same test earlier.
Technology & Digital Behavior
Environmental Miscellany & Wild Cards
Childhood & Developmental Milestones
Key nuance: Language milestones are the strongest childhood predictor of later IQ — much stronger than motor milestones (Flensborg-Madsen, 2018; N=821, followed to age 20–34). Walking early has a weak association that largely disappears once language and social interaction are controlled for. The strongest childhood signals: early sentence formation, early social interaction, and spontaneous reading. However, some profoundly gifted children are late talkers (Einstein famously didn't speak until age 4). Early milestones at 4–12 months predict almost nothing; milestones at 24 months predict substantially more (~20% of IQ variance at age 5–6).
Academic & University Performance
Sports, Athletics & Competitive Gaming
The chess meta-analysis (Burgoyne et al., 2016) found an overall correlation of r≈.24 between cognitive ability and chess skill across all samples. The strongest link is with fluid reasoning (Gf), not crystallized knowledge. Critically, the IQ-chess correlation is stronger in young and amateur players and weakens in elite samples — supporting the idea that IQ provides an initial advantage but practice and deliberate training dominate at expert levels. For esports, a study across 12 competitive games (chess, Go, poker, Scrabble, LoL, Dota 2, CS:GO, etc.) found that national IQ predicted top-player representation at r=.79. Physical sports show essentially zero IQ-performance correlation — the Wonderlic test predicts less than 1% of NFL quarterback career performance.
Occupational Sorting & Career Patterns
Fertility, Reproduction & Dysgenics
SensitiveThe paradox: Higher IQ reliably predicts having fewer children. This is one of the most politically toxic findings in the field. The mechanism is not biology — it's that higher IQ delays education, delays marriage, and delays reproduction, compressing the fertility window (especially for women). Polygenic score studies confirm the pattern has a genetic component: alleles associated with higher cognitive ability are becoming less frequent. The Flynn Effect (rising phenotypic IQ from environmental improvements) historically masked this, but the Flynn Effect has now reversed in several countries. Whether this represents a genuine long-term problem depends on contested assumptions about the relative contributions of genetic vs. environmental factors to population-level intelligence.
Assortative Mating & Relationships
Humor — Expanded
The production/appreciation split matters. Creating original humor correlates much more strongly with intelligence than simply appreciating it. Greengross & Miller (2011) tested comedians against college students: comedians scored higher on both humor production and verbal IQ. The IQ link is strongest for verbally complex forms — sarcasm, irony, satire, wordplay — and essentially absent for slapstick or physical comedy. Sarcasm comprehension requires cognitive effort to decode the contradiction between literal and intended meaning (Gino, Harvard). Gifted children are consistently identified by teachers as having "advanced humor" — Holt (1995) confirmed gifted students recognize and produce more incongruity-based and wordplay jokes. Humor also functions as a "fitness indicator" in mate selection: both sexes rate funny people as more attractive and more intelligent.
Happiness, Life Satisfaction & Wellbeing
Creativity & Divergent Thinking
Income vs. Wealth: The Zagorsky Paradox
Zagorsky (2007) — "Your IQ Has No Relationship to Your Wealth"
Using 7,403 participants from the NLSY79 tracked for 25 years: IQ predicts income ($234–616 per IQ point annually, surviving all controls). But IQ→wealth is statistically indistinguishable from zero. People with IQ 105 have higher average net worth than those with IQ 110. Even IQ 125+ individuals report maxing credit cards (6%), missing payments (11%), and filing bankruptcy at non-trivial rates. Smart people earn more but don't keep more.
"If you look at university parking lots, you don't see Rolls Royces. You see old, low-value vehicles." — Jay Zagorsky, Ohio State. The skills that generate income (reasoning, verbal ability) are not the skills that generate wealth (frugality, patience, impulse control).
Temporal Discounting & Future Orientation
The genetic evidence is striking: Sanchez-Roige et al. (2018) found via GWAS that the genetic signature of temporal discounting overlaps with childhood IQ at rg=−.63 and with college attainment at rg=−.93. This means the genes that make you impatient with future rewards substantially overlap with the genes that lower cognitive ability. The IQ-discounting correlation exceeds the correlation of discounting with any personality trait. The marshmallow test's predictive power, once thought to reflect pure self-control, is now understood as partly an IQ test in disguise — children who wait longer tend to be smarter, and the cognitive ability partly drives both the waiting and the later life outcomes.
Impostor Syndrome & Self-Perception
The impostor-IQ link is indirect but powerful: Impostor syndrome is not caused by high IQ per se, but it concentrates in high-achieving populations where IQ tends to be elevated. The core mechanism: high standards (from genuine competence) + maladaptive perfectionism + attribution of success to luck rather than ability = chronic self-doubt despite objective evidence of capability. Clance & Imes (1978) first described this in high-achieving women. It intensifies during transitions (starting university, new job, promotion) — precisely when high-ability people first encounter cognitive peers and lose the "smartest in the room" identity formed in childhood. The over-preparation/procrastination split maps onto two coping responses: working obsessively to prevent exposure, or delaying to have an excuse for imperfection.
Morality, Fairness & Prosocial Behavior
College Majors & Fields of Study
The SAT/GRE-to-IQ conversion caveat: These estimates are derived from standardized test scores (GRE, SAT) converted to IQ equivalents using established correlations (SAT↔IQ r≈.80; GRE↔IQ r≈.70). The key finding is that Physics students are uniquely dominant — they score highest on both verbal and quantitative sections, not just math. Philosophy students rank near the top on verbal (often #1 or #2) and above average on quantitative, making them the strongest "verbal intelligence" field. The ~16-point IQ gap between Education and Math/Statistics majors (Wai & Kanaya, 2024) is striking and has implications for whether societies draw teachers from their highest-ability pools. The Olson analysis found that the apparent "IQ" ranking of majors is driven almost entirely by quantitative SAT scores (R²=.74), not verbal, which means these rankings partly reflect preference for quantitative work rather than overall cognitive ability.
Lucid Dreaming, Metacognition & Insight
EmergingThe link is metacognition, not IQ directly. Filevich et al. (2015, Max Planck) found that frequent lucid dreamers have larger anterior prefrontal cortex volume and show higher prefrontal activation during metacognitive tasks while awake. Bourke & Shaw found lucid dreamers solve 25% more insight problems. The connection to intelligence is indirect but structurally grounded: the same brain region (BA9/10) supports both lucid dreaming and metacognitive monitoring, and metacognition correlates with fluid intelligence. No study has found a direct IQ↔lucid dreaming frequency correlation, but the shared neural substrate suggests intelligence, lucid dreaming, and metacognition share common biological infrastructure.
Romance, Dating & Mate Selection
The cross-trait mating finding: Physically attractive women tend to marry more intelligent men, but physically attractive men do NOT marry more intelligent women. This asymmetry reflects sexual strategies theory — women can "trade" attractiveness for male intelligence/resources, but the reverse trade is weaker. Both sexes use a "likes-attract" rule (prefer similar IQ), but reject less intelligent mates more strongly than they prefer more intelligent ones. Intelligence above your own level is not more attractive — it just needs to be "enough." Speed-dating research (PNAS, 2007) showed that people's stated preferences barely predict their actual choices — men chose on looks regardless of what they said; women were more selective overall but chose on "total package" rather than any single trait.
Economics, Sociology & Public Policy
Games, Hobbies & Leisure — Expanded
Military, Armed Forces & Combat
The Military as the World's Largest IQ Dataset
The U.S. military has tested more people's cognitive ability than any other institution in history — 1.5 million in WWI, 12 million in WWII, and roughly 1 million per year today via the ASVAB. The ASVAB correlates .80–.90 with standard IQ tests and predicts hands-on job proficiency at ρ=.44–.55 (Cucina et al., 2024) — notably higher than the civilian job performance estimates currently under debate (ρ=.22–.51). The military finding is stronger because the criterion (actually performing job tasks under observation) is more objective than civilian supervisory ratings.
Policy implication: U.S. law (10 U.S.C. §520) prohibits enlistment of individuals scoring below the 10th percentile on the AFQT (~IQ 83). This is one of the few public policies worldwide that explicitly uses cognitive ability as a legal threshold. The 1991 Gulf War demonstrated that units with higher average AFQT scores performed measurably better in combat effectiveness metrics.
Consumer Behavior, Marketing & Persuasion
The IQ vs EQ debate in business, resolved: Both matter, but for different things. Adam Grant's study of sales performance found cognitive ability was 5× more predictive than emotional intelligence — higher-ability salespeople generated $195K annual revenue vs $109K for lower-ability ones, and EQ added nothing after controlling for cognitive ability. But Goleman's framework holds for management: once you're above the ~115 IQ threshold needed to enter a profession, emotional intelligence, social skills, and drive determine who rises. The "three-factor model" (cognitive ability + social skills + drive) is "fundamentally compensatory" — exceptional social skills can partially offset average IQ. The military data confirms this: officer promotion beyond lieutenant depends more on leadership and political skill than raw cognitive ability.
Specific Policy Views & Moral Attitudes
Drink & Food Preferences
Social Dynamics, Hierarchy & Group Behavior
Emotional Intelligence, Affect & Inner Life
Crowd-Sourced, Novel & Contested Findings
Harvard Grant Study & Longitudinal Life Outcomes
Public Intellectuals & Commentary on IQ
References & Key Sources
Lynn, R., Harvey, J., & Nyborg, H. (2009). Average intelligence predicts atheism rates across 137 nations. Intelligence, 37(1), 11–15. [r≈−.20-.24 religiosity/IQ]
Souza, G.H.S., & Cribari-Neto, F. (2015). Intelligence, religiosity and homosexuality non-acceptance: Empirical evidence. Intelligence, 52, 63–70. [National IQ ↔ acceptance, r=−.58]
Kemmelmeier, M. (2008). Is there a relationship between political orientation and cognitive ability? A test of three hypotheses in two studies. Personality and Individual Differences, 45(8), 767–772.
Stankov, L. (2009). Conservatism and cognitive ability. Intelligence, 37(3), 294–304.
Flynn, J.R. (2007). What Is Intelligence?: Beyond the Flynn Effect. Cambridge University Press.
Bratsberg, B., & Rogeberg, O. (2018). Flynn effect and its reversal are both environmentally caused. PNAS, 115(26), 6674–6678. [Norwegian reversal]
Schmidt, F.L., & Hunter, J.E. (1998). The validity and utility of selection methods in personnel psychology. Psychological Bulletin, 124(2), 262–274. [Classic r=.51 job performance estimate]
Steel, P., & Fariborzi, H. (2025). Strong decrease in predictive validity of IQ tests for work performance. Discussed in Progress Focused (July 2024). [Revised to r≈.16; Steel & Fariborzi, 2025 — note: prelim, confirm publication details]
Strenze, T. (2007). Intelligence and socioeconomic success: A meta-analytic review of longitudinal research. Intelligence, 35(5), 401–426. [IQ → income, r≈.30-.40]
Bouchard, T.J. Jr. (2013). The Wilson Effect: The increase in heritability of IQ with age. Twin Research and Human Genetics, 16(5), 923–930. [Adult heritability ≈ .80]
Deary, I.J. (2012). Intelligence. Annual Review of Psychology, 63, 453–482. [System integrity hypothesis]
Stanovich, K.E., West, R.F., & Toplak, M.E. (2013). Myside bias, rational thinking, and intelligence. Current Directions in Psychological Science, 22(4), 259–264. [Myside bias r≈.00 with IQ]
Stanovich, K.E. (2009). What Intelligence Tests Miss: The Psychology of Rational Thought. Yale University Press.
Stanovich, K.E. (2021). The Bias That Divides Us: The Science and Politics of Myside Thinking. MIT Press.
Frederick, S. (2005). Cognitive reflection and decision making. Journal of Economic Perspectives, 19(4), 25–42. [CRT; r≈.40-.50 with IQ]
West, R.F., Meserve, R.J., & Stanovich, K.E. (2012). Cognitive sophistication does not attenuate the bias blind spot. Journal of Personality and Social Psychology, 103(3), 506–519.
Grinblatt, M., Keloharju, M., & Linnainmaa, J.T. (2011). IQ and stock market participation. Journal of Finance, 66(6), 2121–2164. [N≈160,000 Finnish males; 20% participation gap]
Grinblatt, M., Keloharju, M., & Linnainmaa, J.T. (2012). IQ, trading behavior, and performance. Journal of Financial Economics, 104(2), 339–362. [High-IQ: less disposition effect, better Sharpe ratios]
Agarwal, S., & Mazumder, B. (2013). Cognitive abilities and household financial decision making. American Economic Journal: Applied Economics, 5(1), 193–207.
Proto, E., Rustichini, A., & Sofianos, A. (2019). Intelligence, personality, and gains from cooperation in repeated interactions. Journal of Political Economy, 127(3), 1351–1390.
Proto, E., Rustichini, A., & Sofianos, A. (2022). Intelligence, errors and strategic choices in the repeated prisoners' dilemma. Review of Economic Studies. [High-IQ groups converge to full cooperation; replicated 2025]
Jones, G. (2008). Are smarter groups more cooperative? Evidence from prisoner's dilemma experiments, 1959–2003. Journal of Economic Behavior & Organization, 68(3-4), 489–497.
Antonakis, J., House, R.J., & Simonton, D.K. (2017). Can super smart leaders suffer from too much of a good thing? The curvilinear effect of intelligence on perceived leadership behavior. Journal of Applied Psychology, 102(7), 1003–1021. [Optimal leader IQ ≈ 1.2 SD above group]
Tsukahara, J.S., Harrison, T.L., & Engle, R.W. (2016). The relationship between baseline pupil size and intelligence. Cognitive Psychology, 91, 109–123. [r≈.30-.39 extreme groups; locus coeruleus hypothesis]
Tsukahara, J.S., & Engle, R.W. (2021). Is baseline pupil size related to cognitive ability? Yes (under proper lighting conditions). Cognition, 211, 104643.
Unsworth, N., Miller, A.L., & Robison, M.K. (2023). Baseline pupil diameter does not correlate with fluid intelligence. Psychonomic Bulletin & Review. [Replication failure; methodological debate]
Kokkinakis, A.V., et al. (2017). Exploring the relationship between video game expertise and fluid intelligence. PLOS ONE, 12(11), e0186621. [MOBA skill ↔ Gf, r≈.30-.40]
Stansfeld, S.A., et al. (2005). Aircraft and road traffic noise and children's cognition and health. Lancet, 365(9475), 1942–1949. [Chronic noise → lower reading/IQ]
Flensborg-Madsen, T., & Mortensen, E.L. (2018). Associations of early developmental milestones with adult intelligence. Child Development, 89(2), 638–648. [N=821; language milestones β=−.17; 20% variance at 24m]
Deary, I.J., Strand, S., Smith, P., & Fernandes, C. (2007). Intelligence and educational achievement. Intelligence, 35(1), 13–21. [N=70,000; r=.81 IQ ↔ GCSE scores at 16]
Lubinski, D., & Benbow, C.P. (2006). Study of Mathematically Precocious Youth after 35 years. Perspectives on Psychological Science, 1(4), 316–345. [Top 0.01%: 50% doctorates; linear benefit within gifted]
Coyle, T.R., & Pillow, D.R. (2008). SAT and ACT predict college GPA after removing g. Intelligence, 36(6), 719–729.
Burgoyne, A.P., et al. (2016). The relationship between cognitive ability and chess skill: A comprehensive meta-analysis. Intelligence, 59, 72–83. [Overall r≈.24; strongest with Gf; weaker in experts]
Kokkinakis, A.V., et al. (2017). Exploring the relationship between video game expertise and fluid intelligence. PLOS ONE, 12(11), e0186621. [MOBA rank ↔ Gf]
Kirkegaard, E.O.W. (2019). Is national mental sport ability a sign of intelligence? Mankind Quarterly, 59(3). [12 games; r=.79 national IQ ↔ top player representation]
Hauser, R.M. (2002). Meritocracy, cognitive ability, and the sources of occupational success. CDE Working Paper No. 98-07 (revised).
Wai, J., & Kanaya, T. (2024). Meta-analysis: On average, undergraduate students' intelligence is merely average. ScienceOpen Preprints. [Average undergrad IQ ≈ 102; −0.2 pts/year decline]
Ruf, D. (2005). Losing Our Minds: Gifted Children Left Behind. Great Potential Press. [Five levels of giftedness; milestone timetables]
Retherford, R.D., & Sewell, W.H. (1988). Intelligence and family size reconsidered. Social Biology, 35(1-2), 1–40. [N=9,000; decline of .81 IQ pts/generation; .57 after heritability correction]
Lynn, R., & Van Court, M. (2004). New evidence of dysgenic fertility for intelligence in the United States. Intelligence, 32(2), 193–201. [Consistently negative 1900–1979 cohorts; .90 pts/gen]
Kanazawa, S. (2014). Intelligence and childlessness. Social Science Research, 48, 157–170. [+15 IQ pts → 21–25% lower odds of parenthood in women]
Lynn, R. (2011). Dysgenics: Genetic Deterioration in Modern Populations. 2nd ed. Ulster Institute for Social Research.
Kong, A., et al. (2017). Selection against variants in the genome associated with educational attainment. PNAS, 114(5), E727–E732. [Polygenic scores for g declining across generations in Iceland]
Mascie-Taylor, C.G.N. (1989). Spouse similarity for IQ and personality and convergence. Behavior Genetics, 19(2), 223–227. [r≈.40–.45 spousal IQ; no convergence; initial assortment only]
Jensen, A.R. (1998). The g Factor: The Science of Mental Ability. Praeger. [Spousal IQ r≈.45 across 43 studies; 15–20% variance from assortative mating]
Gignac, G.E., et al. (2019). People tend to overestimate their romantic partner's intelligence even more than their own. Intelligence, 73, 41–51. [218 couples; +30 pts self, +36–38 pts partner]
Greengross, G., & Miller, G. (2011). Humor ability reveals intelligence, predicts mating success, and is higher in males. Intelligence, 39(4), 188–192. [Comedians > students on verbal IQ and humor production]
Holt, D. (1995). The relationship between humor and giftedness. [Gifted students: more incongruity-based and wordplay jokes]
Gino, F., & Galinsky, A. (2015). Sarcasm, creativity, and the brain. Harvard Business School Working Paper. [Sarcasm requires overcoming literal/intended contradiction → activates creative thinking]
Ali, A., et al. (2013). The relationship between happiness and intelligent quotient: The contribution of socio-economic and clinical factors. Psychological Medicine, 43(6), 1303–1312. [N=6,870; IQ 70–99 lowest happiness; mediators reduce link 50%]
Li, N.P., & Kanazawa, S. (2016). Country roads, take me home… to my friends: How intelligence, population density, and friendship affect modern happiness. British Journal of Psychology, 107(4), 675–697. [High IQ + socializing = lower satisfaction]
Nikolaev, B., & McGee, J.J. (2016). Relative verbal intelligence and happiness. Intelligence, 59, 1–7. [National IQ ↔ happiness inequality r=−.50]
Zagorsky, J.L. (2007). Do you have to be smart to be rich? The impact of IQ on wealth, income and financial distress. Intelligence, 35(5), 489–501. [N=7,403; IQ→income r≈.30; IQ→wealth ≈0; $234–616/IQ pt/yr]
Hauck, W., & Thomas, J. (1972). The relationship of humor to intelligence, creativity, and intentional and incidental learning. Journal of Experimental Education, 40(4), 52–55. [Children: humor-IQ r=.91; humor-creativity r=.89]
Benedek, M., et al. (2021). The relationship between intelligence and divergent thinking — a meta-analytic update. Journal of Intelligence, 9(2), 23. [849 effects, N=34,610; r=.25 overall; DT originality r≈.31-.37]
Kałowski, P., et al. (2023). Irony use and cognitive correlates. [Irony ↔ creativity, cognitive flexibility, nonverbal IQ, mindfulness]
Robson, D. (2015). The surprising downsides of being clever. BBC Future. [Summary of Terman's longitudinal findings on gifted unhappiness]
Raghunathari, R. (2016). If You're So Smart, Why Aren't You Happy? Portfolio/Penguin. [Autonomy, mastery, relationships as happiness mediators]
Sanchez-Roige, S., et al. (2018). Genome-wide association study of delay discounting in 23,217 adult research participants identifies an association with NCAM1. Nature Neuroscience, 21(1), 16–18. [Genetic overlap: discounting ↔ childhood IQ rg=−.63; ↔ education rg=−.67]
Keidel, K., et al. (2021). Individual differences in intertemporal choice. Frontiers in Psychology, 12, 643670. [Comprehensive review; IQ-discounting effect exceeds personality effects]
Shoda, Y., Mischel, W., & Peake, P.K. (1990). Predicting adolescent cognitive and self-regulatory competencies from preschool delay of gratification. Developmental Psychology, 26(6), 978–986. [Original marshmallow test follow-up]
Clance, P.R., & Imes, S.A. (1978). The impostor phenomenon in high-achieving women: Dynamics and therapeutic intervention. Psychotherapy: Theory, Research & Practice, 15(3), 241–247.
Bravata, D.M., et al. (2020). Prevalence, predictors, and treatment of impostor syndrome: A systematic review. Journal of General Internal Medicine, 35(4), 1252–1275.
Furnham, A. (2001). Self-estimates of intelligence: Culture and gender difference. Personality and Individual Differences, 31(8), 1381–1405. [Men overestimate, women underestimate own IQ]
Kruger, J., & Dunning, D. (1999). Unskilled and unaware of it. Journal of Personality and Social Psychology, 77(6), 1121–1134. [Dunning-Kruger effect]
Educational Testing Service (ETS). GRE scores by intended graduate major field (2017–2020). [Physics & Astronomy highest composite; Education ~1 SD below on both verbal and quantitative]
College Board (2021). SAT scores of college-bound seniors by intended major. [Mathematics/Statistics SAT Total 117.9 IQ equivalent vs Education 101.6]
Frey, M.C., & Detterman, D.K. (2004). Scholastic assessment or g? The relationship between the SAT and general cognitive ability. Psychological Science, 15(6), 373–378. [SAT ↔ g correlation r≈.82]
Olson, R. (2014). Average IQ of students by college major and gender ratio. [Quantitative SAT drives apparent IQ ranking; R²=.74 with gender ratio]
Filevich, E., Dresler, M., Brick, T.R., & Kühn, S. (2015). Metacognitive mechanisms underlying lucid dreaming. Journal of Neuroscience, 35(3), 1082–1088. [Larger aPFC in lucid dreamers; higher metacognitive activation]
Bourke, P., & Shaw, H. (2014). Spontaneous lucid dreaming frequency and waking insight. Dreaming, 24(2), 152–159. [Lucid dreamers solve 25% more insight puzzles]
Lubinski, D., & Benbow, C.P. (2006). Study of Mathematically Precocious Youth. [High V+Q scorers disproportionately enter physics]
ETS (2020). GRE Scores by Intended Graduate Major. Educational Testing Service. [Physics/Astronomy top both Verbal & Quantitative]
College Board (2021). SAT Suite of Assessments Annual Report. [Math/Stats ~118 IQ vs Education ~102 IQ; ~16pt gap]
Olson, R. (2014). Average IQ of students by college major and gender ratio. [Quantitative SAT drives hierarchy R²=.74]
Schulte, M.J., et al. (2004). Emotional intelligence: Not much more than g and personality. Personality and Individual Differences, 37(5), 1059–1068. [EI ↔ g r=.45]
Baker, C.A., et al. (2014). Reading the Mind in the Eyes: A meta-analysis. [RMET ↔ IQ r=.24]
Nguyen, N.N., et al. (2020). A meta-analytic investigation of the relationship between EI and emotional manipulation. SAGE Open.
Heil, C. (2021). Hochbegabte Erwachsene [Gifted Adults]. Psychotherapie Heil. [N=87; IQ 130–144; fast thinking r=.24; logical ability r=.31; 88.9% no school support]
Rost, D.H. (2000). Hochbegabte und hochleistende Jugendliche. Waxmann. [Marburger Hochbegabtenprojekt; g as central variable]
Heller, K.A. (2001). Münchner Hochbegabtenuntersuchung. [Munich Model of Giftedness; multidimensional]
Gross, M.U.M. (2006). Exceptionally gifted children: Long-term outcomes of academic acceleration and nonacceleration. Journal for the Education of the Gifted, 29(4), 404–429. [IQ >160; acceleration → higher life satisfaction]
Metzen, D., Genç, E., et al. (2023). Structural architecture and brain network efficiency links polygenic scores to intelligence. Human Brain Mapping. [Ruhr-Universität Bochum; genes → brain networks → IQ pathway]
ETS (2020). GRE scores by intended graduate major field. Educational Testing Service. [Physics/Astronomy top composite; Education ~1 SD below Math/Stats]
College Board (2021). SAT scores by intended college major. [Nationally representative sample SAT Total = 1010]
Wai, J., & Kanaya, T. (2024). Meta-analysis: On average, undergraduate students’ intelligence is merely average. ScienceOpen Preprints.
Frey, M.C., & Detterman, D.K. (2004). Scholastic assessment or g? The relationship between the Scholastic Assessment Test and general cognitive ability. Psychological Science, 15(6), 373–378. [SAT ↔ g r≈.82]
Breit, M., et al. (2024). The stability of cognitive abilities: A meta-analytic review of longitudinal studies. Psychological Bulletin, 150(4), 399–439. [r=.67 over 59 years; r=.54 over 79 years]
Sackett, P.R., et al. (2022). Revisiting meta-analytic estimates of validity in personnel selection. Journal of Applied Psychology, 107(11), 2040–2068. [Revised GMA→job to ρ=.31]
Sackett, P.R., et al. (2024). [New meta-analysis ρ=.22]
Berry, C.M., et al. (2024). Insights from an updated personnel selection meta-analytic matrix. Journal of Applied Psychology. [Excluding GMA: little validity loss, large adverse impact reduction]
Hambrick, D.Z., et al. (2024). The validity of general cognitive ability predicting job-specific performance is stable across different levels of job experience. Journal of Applied Psychology, 109(3), 437–455.
Sjöberg, A., & Sjöberg, S. (2025). General cognitive ability and job performance in personnel selection in Sweden: A meta-analysis. [observed r=.19, corrected ρ=.32]
Stanek, K.C., & Ones, D.S. (2023). Meta-analytic relations between personality and cognitive ability. PNAS, 120(23), e2212794120. [60,690 relations; 3,543 meta-analyses; millions of participants]
Horwitz, T.B., et al. (2023). Evidence of correlations between human partners based on systematic reviews and meta-analyses of 22 traits. Nature Human Behaviour, 7, 1169–1183. [~23,000 pairs; cognitive ability among strongest assortment variables]
Zietsch, B.P., et al. (2011). Variation in human mate choice: Simultaneously investigating heritability, parental influence, sexual imprinting, and assortative mating. American Naturalist, 177(5), 605–616. [N>20,000; near-zero genetic influence on mate choice itself]
Todd, P.M., et al. (2007). Different cognitive processes underlie human mate choices and mate preferences. PNAS, 104(38), 15011–15016. [Speed-dating: stated preferences ≠ actual choices]
Gignac, G.E., et al. (2019). People tend to overestimate their romantic partner’s intelligence. Intelligence, 73, 41–51. [218 couples; +36–38 pts partner overestimation]
Lynn, R., & Vanhanen, T. (2002). IQ and the Wealth of Nations. Praeger. [National IQ ↔ GDP r≈.70; contested methodology]
Jones, G., & Schneider, W.J. (2006). Intelligence, human capital, and economic growth: A Bayesian averaging of classical estimates approach. Journal of Economic Growth, 11(1), 71–93. [IQ = “best predictor” across 67+ variables]
Heckman, J.J. (2006). Skill formation and the economics of investing in disadvantaged children. Science, 312(5782), 1900–1902. [Non-cognitive skills compensate for lower IQ; Nobel laureate]
Poropat, A.E. (2009). A meta-analysis of the five-factor model of personality and academic performance. Psychological Bulletin, 135(2), 322–338. [Conscientiousness ↔ GPA nearly = IQ ↔ GPA]
Neubauer, A.C., & Knorr, E. (1998). Three paper-and-pencil tests for speed of information processing. Personality and Individual Differences, 25(3), 521–531. [Reaction time ↔ IQ r≈−.30 to −.40]
Spitzer, M. (2018). Zur Erforschung menschlicher Intelligenz. Nervenheilkunde, 37(9), 617–633. [Norwegian Flynn reversal; school reform +1–5 IQ pts; German-language review]
Kokkinakis, A.V., et al. (2017). Exploring the relationship between video game expertise and fluid intelligence. PLOS ONE, 12(11), e0186621. [MOBA rank ↔ Gf]
Erceg, N., Greenberg, S., & Cobeta, B. (2024). What’s really true about intelligence and IQ? We empirically tested 40 claims. ClearerThinking.org. [N=3,691; 62 tasks; 40 claims tested]
PNAS Nexus (2023). Cognitive ability and ideology join forces in the culture war: A model of opinion formation. [Argument advantage model]
Onraet, E., et al. (2015). The association of cognitive ability with right-wing ideological attitudes and prejudice: A meta-analytic review. European Journal of Personality, 29, 599–621. [67 studies, N>84K]
Edwards, T., et al. (2024). Predicting political beliefs with polygenic scores for cognitive performance and educational attainment. Intelligence. [Within-family design; polygenic scores → social liberalism]
Mortensen, E.L., et al. (2005). Intelligence in relation to later beverage preference and alcohol intake. Addiction, 100(10), 1445–1452. [Danish cohort N=1,800; wine preference OR=2.8]
Rick, S., & Schweitzer, M. (2012). The imbibing idiot bias. Journal of Consumer Psychology, 23(2), 212–219. [Holding alcohol → perceived as less intelligent]
Li, N.P., & Kanazawa, S. (2016). Country roads, take me home… to my friends: How intelligence, population density, and friendship affect modern happiness. British Journal of Psychology, 107(4), 675–697.
Taleb, N.N. (2019/2025). IQ is largely a pseudoscientific swindle. Medium/INCERTO. [Fat tails argument; R² critique]
Richardson, K. (2015). Does IQ really predict job performance? PMC. [Critique of range restriction corrections and supervisor ratings]
Schaefer, J.D., et al. (2016). Early-life intelligence predicts midlife biological age. Journal of Gerontology B, 71(6), 968–977.
Elliott, M.L., et al. (2021). Brain-age in midlife is associated with accelerated biological aging and cognitive decline. Molecular Psychiatry, 26, 3829–3838.
Moffitt, T.E., et al. (2011). A gradient of childhood self-control predicts health, wealth, and public safety. PNAS, 108(7), 2693–2698.
Richmond-Rakerd, L.S., et al. (2021). Childhood self-control forecasts the pace of midlife aging. PNAS, 118(3), e2010211118.
Reuben, A., et al. (2017). Association of childhood blood lead levels with cognitive function and socioeconomic status at age 38. JAMA, 317(12), 1244–1251.
Caspi, A., et al. (2016). Childhood forecasting of a small segment of the population with large economic burden. Nature Human Behaviour, 1, 0005.
Vaillant, G.E. (1977). Adaptation to Life. Harvard University Press. [Grant Study: defense mechanisms > IQ for life outcomes]
Vaillant, G.E. (2002). Aging Well. Little, Brown. [Education predicts healthy aging beyond IQ and SES]
Waldinger, R.J., & Schulz, M.S. (2023). The Good Life: Lessons from the World’s Longest Scientific Study of Happiness. Simon & Schuster. [Warm relationships > IQ for health at 80]
Henderson, R. (2023). Nobody is a prisoner of their IQ. Rob Henderson’s Newsletter. [Social norms compensate for lower IQ; luxury beliefs concept]
Social Behavior & Sexuality