Intelligence & Cognition
Clear, science-based guides to IQ, memory, processing speed, cognitive bias, and how the mind actually learns and thinks.
What Is IQ? A Plain-English Guide to Intelligence Testing
IQ is one of the most cited and most misunderstood numbers in psychology. Here is what it measures, what it predicts, and what it leaves out.
Fluid vs Crystallized Intelligence: The Two Kinds of Smart
Psychologists split intelligence into the ability to reason on the spot and the store of knowledge you have built. Here is how the two differ and age.
Is IQ Fixed? What Science Says About Changing Intelligence
Many people assume intelligence is set for life. The evidence is more hopeful and more nuanced than either side of the debate suggests.
Does Brain Training Work? Separating Hype from Evidence
Brain-training games promise a sharper mind, but the science is more modest. Here is what transfers, what does not, and what to do instead.
What Is Working Memory? The Mind's Scratchpad, Explained
Working memory is the small, busy space where you hold and manipulate information right now. Here is how it works and why it shapes daily life.
What Is Processing Speed? The Pace of Thought, Explained
Processing speed is how quickly your brain handles familiar information. Here is why it matters, how it changes with age, and what you can do about it.
Types of Memory: Sensory, Short-Term, Working, and Long-Term
Memory is not one system but several, each with its own job and timescale. Here is how the main types differ and work together.
Emotional vs Cognitive Intelligence: Different Tools for Different Jobs
IQ-style reasoning and emotional intelligence are often framed as rivals. They are actually separate capacities that predict different kinds of success.
What Is Cognitive Bias? Why Good Minds Make Bad Judgments
Cognitive biases are predictable mental shortcuts that distort judgment in everyone. Here is why they exist and how to defend against the costly ones.
Does Multitasking Work? The Hidden Cost of Doing It All at Once
Multitasking feels productive but usually means rapid task-switching with a measurable toll. Here is what the evidence shows and how to work with attention.