Carroll’s Three-Stratum Theory of Intelligence
By the late twentieth century, intelligence research had accumulated an awkward abundance of results. Spearman had identified general covariance.
How Are Executive Functions and Intelligence Related?
Executive functions and intelligence overlap because demanding reasoning requires cognitive control. But executive functions are not one thing, and their relationships with intelligence are unequal.
Cattell-Horn Theory: What Are Fluid and Crystallized Intelligence?
Knowing that intelligence contains broad abilities creates a new question: **what kind of abilities are they, and why do they develop differently?
How Are Attention and Intelligence Related?
Attention and intelligence are related because reasoning
Thurstone’s Primary Mental Abilities: Is Intelligence Made of Several Abilities?
Once psychologists began taking general intelligence seriously, another problem became harder to ignore.
How Are Memory and Intelligence Related?
Intelligence depends on memory, but there is no single
Spearman’s Two-Factor Theory of Intelligence: What Are g and s?
At the beginning of the twentieth century, psychologists faced an intriguing pattern. Measures that seemed to test quite different mental abilities tended to correlate.
What Is Reaction Time and What Does It Tell Us?
A light appears. You press a button. The interval can be measured to the millisecond. That apparent simplicity has made reaction time one of the oldest and most powerful tools in experimental psychology.
What Is the Positive Manifold — and Why Do Intelligence Tests Correlate?
Give a large group of people a sufficiently varied set of cognitive tests: reasoning, vocabulary, memory, spatial problems, processing speed.
What Is Retrieval Fluency?
Name as many animals as you can in one minute. At first, examples may arrive easily: dog, cat, horse, elephant. Then retrieval slows. You may switch to a category—birds, sea animals, farm animals—to generate more.