What Is Behavioral Activation
Behavioral activation treats depression by reversing the withdrawal cycle through structured activity. Learn Lewinsohn's model, Jacobson's findings, and the evidence base.
January 2025
Stereotype Threat: When Fear of Confirming Becomes Real
In 1995, Claude Steele and Joshua Aronson gave Black and white Stanford students a difficult verbal test.
Deep Learning: Unraveling AI's Layered Learning Process
Deep learning uses neural networks with many layers to learn complex patterns from data, powering breakthroughs in image recognition, language,...
Understanding Social Loafing in Group Dynamics
In 1913, Max Ringelmann had men pull a rope alone and in groups. Alone, each man pulled with about 63 kg of force.
Social Identity Theory: Favoring Our In-Group
In 1970, Henri Tajfel told Bristol schoolboys they preferred either Klee or Kandinsky paintings — a distinction Tajfel invented on the spot.
The Norm of Reciprocity: Gifts, Debts, and Obligations
In 1971, Dennis Regan had a confederate give subjects a Coke during a break in an experiment.
Operant Conditioning: Consequences and Their Limits
In 1930, B.F. Skinner placed a rat in a box with a lever. When the rat pressed the lever, a food pellet dropped. The rat pressed more.
The Implicit Association Test: Measuring Hidden Bias
Anthony Greenwald, Debbie McGhee, and Jordan Schwartz's 1998 paper introduced a test that could measure racial bias in milliseconds.
Growth Mindset: The Belief That Changes What Failure Means
In the 1980s, Carol Dweck watched children in her Columbia lab respond to difficult problems.
Cognitive Behavioral Therapy: The Science of How CBT Works
In the 1960s, Aaron Beck was treating depressed patients using psychoanalysis — free association, dream interpretation, uncovering unconscious...
Attachment Theory and Its Impact on Relationships
In 1957, Harry Harlow placed infant rhesus monkeys with two wire surrogates — one that provided milk, one wrapped in terrycloth that provided...
Terror Management Theory: The Role of Death in Life
In 1989, municipal court judges were reminded of their own mortality and then asked to set bail for a prostitution case.
System Justification Theory and Its Social Implications
Women rate male job candidates more favorably than identical female candidates. Working-class voters oppose redistribution more strongly than the...
Understanding Self-Determination Theory and Motivation
In 1971, Edward Deci paid students to solve Soma puzzles they previously enjoyed — and found they spent less time on the puzzles during free time...
Artificial Intelligence: Understanding Its Core Functions
Artificial intelligence is technology that enables machines to perform tasks that normally require human intelligence, from recognizing images to...
Regulatory Focus Theory: Promotion vs. Prevention Mindsets
E. Tory Higgins showed children a cartoon animal that was either cheerful when it found its favorite food or sad when it didn't.
Moral Foundations Theory: Why Liberals and Conservatives Differ
Jonathan Haidt asked subjects to evaluate a scenario: a family eats their dog after it dies in a car accident. No one is harmed. Everyone consents.
Groupthink: How Cohesion Leads to Poor Decision-Making
After the Bay of Pigs disaster, John F. Kennedy asked his advisors: 'How could I have been so stupid?' The plan was transparently flawed.
Flow State: The Psychology Behind Optimal Experience
Mihaly Csikszentmihalyi interviewed chess players, rock climbers, surgeons, and composers and found they described their best experiences in nearly...
Deindividuation: The Impact of Anonymity on Behavior
In 1969, Philip Zimbardo had NYU students administer electric shocks to another person. Half wore their normal clothes and name tags.
Construal Level Theory: The Effects of Distance
Nira Liberman and Yaacov Trope asked students to describe activities — taking a trip, eating breakfast, reading — either for tomorrow or for next...
Prospect Theory: Why Framing Changes How Outcomes Feel
Tversky and Kahneman's 1981 Asian Disease Problem: 72% of subjects chose certain survival of 200 people over a gamble for all 600.
Obedience to Authority: The Dangers of Compliance
Stanley Milgram asked psychiatrists to predict how many Yale subjects would administer the maximum 450-volt shock to another person if ordered to...
Mental Accounting: Why a Dollar Is Not Always a Dollar
You have two $100 bills in your wallet: one earmarked for rent, one for entertainment. You spend the entertainment $100 on dinner.
Learned Helplessness: Why People Stop Trying to Escape
Martin Seligman and Steven Maier gave dogs inescapable electric shocks in 1967. When later placed in a box where escape was easy, the dogs did not...
Inattentional Blindness: Missing What We Don't Notice
In 1999, Daniel Simons and Christopher Chabris asked subjects to count basketball passes in a video.
What Is a Neural Network: How AI Learns From Data
A neural network is an AI system inspired by the brain, built from layers of connected nodes that learn patterns from data to make predictions.
Implicit Bias: Exploring Unconscious Prejudices
In 1998, Anthony Greenwald, Debbie McGhee, and Jordan Schwartz published the Implicit Association Test — a measure of automatic mental associations...
Elaboration Likelihood Model: How Persuasion Actually Works
In 1984, Richard Petty and John Cacioppo told some students that a proposed exam policy would take effect at their university next year (high...
Cognitive Dissonance Reduction Strategies
A smoker who knows smoking causes cancer has a problem: the belief 'I smoke' conflicts with the belief 'smoking kills.' The discomfort of that...
Anchoring and Adjustment: Influence of Initial Numbers
Tversky and Kahneman spun a rigged wheel that landed on either 10 or 65, then asked subjects how many African countries are in the United Nations.