You’ve received an IQ test report — perhaps for yourself, your child, or a client. It’s filled with numbers, percentiles, confidence intervals, and subtest scores. What does it all mean? This guide walks you through interpreting a cognitive ability report the way a psychometrician would, helping you understand not just …
WAIS-IV vs. WAIS-V: What Changed and Why It Matters for Your IQ Score
The Wechsler Adult Intelligence Scale is the most widely used IQ test in the world. When Pearson released the WAIS-V in 2024 — the first major revision since the WAIS-IV appeared in 2008 — it introduced significant structural changes that affect how cognitive ability is measured, scored, and interpreted. Whether …
Do IQ Tests Measure What They Claim? Common Criticisms Answered
IQ tests are among the most scrutinized instruments in all of psychology. Critics argue they are culturally biased, too narrow to capture real intelligence, and used to justify inequality. Defenders argue they are the most rigorously validated psychological measures in existence. Both camps have valid points — and understanding where …
IQ Test Accuracy: How Reliable Are Online IQ Tests vs. Professional Assessments?
A quick search for “IQ test” returns dozens of websites promising to measure your intelligence in 10 minutes. Meanwhile, a professional cognitive assessment takes 2–3 hours, costs hundreds of dollars, and requires a trained psychologist. Are the free online versions worth anything, or are they little more than entertainment? The …
Psychometrics: The Science of Psychological Measurement
Psychometrics, a specialized branch within psychology, is dedicated to the theory and methodology of psychological measurement. This discipline encompasses the development and refinement of testing instruments, measurement techniques, and assessment procedures aimed at quantifying latent psychological constructs—attributes not directly observable but inferable through systematic analysis. Such constructs include intelligence, personality …
Tellegen & Briggs Formula 4 Calculator at Cogn-IQ.org
The Tellegen & Briggs Formula 4 Calculator, available at Cogn-IQ.org, is a specialized tool designed to help professionals recalibrate and interpret scores from psychological assessments. It provides an efficient way to calculate the Tellegen-Briggs Index (TBI), which is particularly useful when standardization data is unavailable or limited. Background The Tellegen-Briggs …
The Complex Journey of the WAIS: Insights and Transformations
The Wechsler Adult Intelligence Scale (WAIS), developed in 1955 by David Wechsler, introduced a broader and more dynamic approach to assessing cognitive abilities. Over the years, it has been refined through several editions, becoming one of the most widely used tools in psychological and neurocognitive evaluations. This post reviews its …
Overclaiming: Insights from 40,000 Teens
Overclaiming, where individuals assert knowledge of concepts they do not actually understand, offers a fascinating glimpse into confidence and self-perception. In their 2023 study, Jerrim, Parker, and Shure examine this phenomenon through an analysis of PISA data from over 40,000 teenagers across nine Anglophone countries. This investigation reveals significant patterns …
Explore the validity and reliability of the JCTI, and its strong correlations with SAT Math and RIST scores.
The Jouve–Cerebrals Test of Induction (JCTI) is a nonverbal measure of inductive reasoning. Using data from N = 2,306 examinees, this study assessed score reliability and concurrent validity against external benchmarks. Findings indicate stable internal consistency and strong convergence with quantitative and nonverbal indicators, supporting use in educational and vocational …
Assessing the Reliability of JCCES in Measuring Crystallized Cognitive Skills
The Jouve-Cerebrals Crystallized Educational Scale (JCCES) has been thoroughly evaluated for its reliability and consistency. This large-scale study, involving 1,079 examinees, utilized both Classical Test Theory (CTT) and Item Response Theory (IRT) methods to analyze the scale’s performance and internal structure. Background The JCCES was developed to measure crystallized cognitive …