Category: the-science-of-cognitive-testing

The Flynn Effect: Why Average IQ Scores Have Risen Over Time If you compared raw IQ test performance from the early 20th century to today without adjusting for anything, you’d find something striking: average scores have risen substantially over the decades. This phenomenon, named after researcher James Flynn who extensively documented it, is known as […]

What the Bell Curve Really Tells You About IQ The “bell curve” is one of the most recognizable images associated with IQ testing — a smooth, symmetrical hump showing most people clustered near the middle, with progressively fewer people toward each extreme. Understanding what this shape actually represents clears up a lot of common confusion […]

Why IQ Tests Use Timed Questions If you’ve ever felt rushed during an IQ test and wondered why time pressure is part of the format at all, you’re touching on a deliberate design choice rooted in what psychologists consider a genuine, separate component of cognitive ability: processing speed. This design choice also explains a common […]

The Different Types of Intelligence Tests Explained “IQ test” is often treated as a single, generic thing, but there are actually several distinct types of intelligence assessments in use, each with a different design philosophy and purpose. Knowing the differences helps you understand what any specific score is actually telling you. Understanding this landscape also […]

How IQ Tests Are Designed and Standardized An IQ test isn’t just a set of clever puzzles thrown together. Building a psychometrically sound test involves years of statistical validation, large-scale norming, and careful item design — a process most test-takers never see, and understanding it gives real insight into why some tests deserve more trust […]