Studies correlating IQ to genius are mostly bad science

Original Article ↗ Hacker News Discussion ↗

What IQ Measures (and Doesn’t)

  • Repeated emphasis that IQ is at best a rough proxy for certain cognitive skills, especially around the average range.
  • Many argue “intelligence” is multidimensional (verbal, numerical, spatial, memory, metacognition, executive function, etc.), so forcing it into a single scalar (IQ) is misleading.
  • Several posters stress that high IQ ≠ genius, accomplishment, or even competence; it mainly reflects how well you do on IQ‑like tasks.

Scale, Linearity, and Distribution

  • Debate over “linearity”: some note IQ is ordinal, not a linear or ratio scale (100 isn’t “twice” 50), and shouldn’t be treated like height.
  • Others counter that you can still rank people on a line of IQ scores, and both IQ and height are roughly normally distributed.
  • Disagreement about “by definition IQ is normal”: some say test norms enforce an approximate normal distribution; others point out real tests are calibrated episodically and can deviate, especially at the tails.
  • Consensus that measurements become unreliable above ~120 and at very low scores due to sparse calibration data. Claims of 160+ or 170+ are widely treated as noise or outright bogus.

Practice vs. Innate Ability

  • Many anecdotes about specific cognitive talents (visualizing equations, perfect pitch, remembering names or conversations, spatial navigation).
  • One camp stresses practice, enjoyment, and training can build impressive abilities; another highlights “hardware” differences (e.g., prosopagnosia vs. super recognizers) that practice can’t fully overcome.
  • Discussion that fMRI and brain-structure findings are hard to interpret because training itself reshapes the brain.

Clinical and Practical Uses

  • Strong support for IQ batteries as diagnostic tools for learning disabilities, ADHD, and atypical profiles (large subtest gaps).
  • Stories of people with mixed strengths/weaknesses whose IQ testing led to useful diagnoses and coping strategies.

Correlation with Life Outcomes

  • Some argue IQ strongly tracks education, income, learning speed, and even athletic performance.
  • Others respond that socioeconomic context (zip code, parental income) and non-IQ traits (motivation, organization, mental health) often dominate outcomes.

Cultural and Social Critiques

  • IQ obsession and boasting are mocked; Mensa is described as a poor filter for wisdom or character.
  • Several note Goodhart’s law: once IQ is treated as a status metric, its meaning degrades.