Erikson, Piaget & Psychology Theories & Concepts Explained

Zone of Proximal Development: What It Is and Why It Changes How Teaching Works

A toddler can stack two blocks alone but builds a five-block tower the moment a parent steadies the base. A student stares blankly at a word problem, then solves it in under a minute once a teacher rephrases the question. Neither child got smarter in that instant. They were both already standing in what Lev Vygotsky called the zone of...

Instinct Theory of Motivation: McDougall’s Instinct Theory, William James & How Biology Drives Behavior

By the 1920s, psychologists had proposed over 6,000 separate human instincts. An instinct for gregariousness, an instinct for stamp collecting, an instinct for avoiding apples grown in your own orchard. The list grew so absurd that the idea it was trying to explain, the instinct theory of motivation, collapsed under its own weight within a decade.

Social Comparison Theory: Upward vs. Downward Social Comparison, Festinger & Social Media

Picture two students walking out of the same calculus exam. One glances at a classmate who clearly aced it and feels a jolt of motivation. The other glances at a classmate who bombed it worse than they did and feels a flicker of relief. Same exam, same room, completely different emotional outcome, and the only variable is who they happened...

Kurt Lewin’s Field Theory: The Equation Psych Students Get Wrong

You’ve probably seen the equation B = f(P,E) in a psych textbook and moved on without a second thought. But Kurt Lewin’s field theory was actually addressing a question that trait psychologists and behaviorists both got wrong for decades: does personality or the situation drive behavior. Lewin’s answer, developed in the 1930s and 1940s, was that neither one works alone.

More Knowledgeable Other: Why Vygotsky’s MKO Still Matters

A five-year-old cannot tie her shoes alone, then one afternoon her older brother sits beside her, wraps his hands loosely around hers, and talks her through the loop and pull three times. By the fourth try, she does it without him. Nothing about her brain changed in that hour. What changed was who was next to her. Lev Vygotsky built...

Kohlberg’s Stages of Moral Development: All 6 Stages Explained with Examples

Kohlberg’s stages of moral development offer one of psychology’s most detailed maps of how people reason about right and wrong. Lawrence Kohlberg identified three levels of moral reasoning — each split into two stages, totaling six — and argued that what separates people isn’t what they decide is right, but why they think it’s right. That distinction changed how psychologists,...