Intelligence Research & Cognitive Science Blog

Research shows test anxiety can reduce IQ scores by 5-12 points through working memory interference and attentional hijacking. Discover the science behind Hembree's landmark meta-analysis, Eysenck's attentional control theory, and evidence-based coping strategies with proven effect sizes.

Research shows that the ideal IQ for leadership is 115-130 -- about one standard deviation above average. Too far above that, and leader effectiveness actually declines. Discover how transformational and transactional leadership styles depend on different intelligence profiles.

IQ explains about 25% of job performance variance -- so what accounts for the other 75%? Research identifies five non-cognitive predictors that rival or exceed IQ: conscientiousness, grit, emotional intelligence, social skills, and growth mindset.

The g-factor is the single most replicated finding in all of psychology. Discover why someone who scores high on vocabulary also tends to excel at math, spatial reasoning, and memory -- and what Spearman's 1904 discovery means for IQ testing today.

Discover the four evidence-based study strategies that high-IQ learners rely on -- retrieval practice, spaced repetition, interleaving, and the Feynman technique -- and how cognitive science proves they boost long-term retention by up to 150%.

A practical checklist of 12 red flags that expose junk IQ tests and 8 markers of legitimate assessments. Learn how to evaluate any online IQ test using psychometric standards before trusting the results.

A scientific examination of online IQ test trustworthiness using peer-reviewed psychometric standards. Learn the reliability benchmarks, validity criteria, and expert frameworks that determine whether a digital cognitive assessment deserves your confidence.

TalentSmart data shows EQ accounts for 58% of job performance across all roles. Explore the salary premiums, promotion rates, and leadership outcomes tied to emotional intelligence -- plus actionable strategies to develop your EQ for career advancement.

Research shows well-designed online IQ tests correlate r = 0.70-0.85 with clinical assessments. This data-driven analysis examines the validation evidence, statistical benchmarks, and reliability metrics that separate accurate tests from entertainment quizzes.

Lumosity paid $2 million to settle false advertising claims about brain training. But does that mean all brain games are useless? Review the evidence on Dual N-Back, Lumosity, Peak, and other popular programs to find out what actually works.

Your IQ score depends on when the test was normed. Learn how normative samples are built, why the WAIS and Stanford-Binet must be updated regularly, and how score drift from the Flynn effect can inflate results by 5-10 points.

IQ measures reasoning ability, but common sense drives everyday decisions. Explore Sternberg's triarchic theory, practical intelligence research, and real-world evidence for which type of smarts actually predicts life success.