Erikson, Piaget & Psychology Theories & Concepts Explained

The Bystander Effect: Why More Witnesses Mean Less Help

A stranger collapses on a busy sidewalk. Dozens of people walk past, yet no one stops to help. This is the bystander effect: a well-documented pattern in which the presence of other people actually lowers the odds that any single person will step in during an emergency. The more witnesses there are, the less personal responsibility each one feels, a...

How Freud Explained Morality Through the Superego

Freud moral development centers on the superego, an internalized authority that runs on guilt and pride instead of reasoning. Freud never proposed a formal theory of morality, but his account of the superego offers a distinctive explanation for how conscience takes shape. While Kohlberg and Piaget explained morality as something children figure out through logic, Freud argued something very different:...

Cialdini’s Principles of Persuasion: The 6 Triggers Behind Every Yes

Cialdini’s principles of persuasion are six psychological triggers that explain why people comply with requests, change their minds, or make purchases they hadn’t planned on. Identified by social psychologist Robert Cialdini in his landmark 1984 book Influence, these principles of persuasion are grounded in universal human tendencies — cognitive shortcuts that make everyday decision-making faster but also surprisingly predictable. Whether...

Albert Bandura’s Self-Efficacy: 4 Sources That Shape What You Believe You Can Do

Albert Bandura didn’t just study what people do — he studied what people believe they can do, and why that belief matters so much. In the 1970s, he introduced Bandura’s self-efficacy theory: the conviction that you are capable of carrying out the actions needed to reach a specific goal. It sounds simple, but this idea turned out to be one...

Emerging Adulthood: Arnett’s Theory of the In-Between Stage After Adolescence

Emerging adulthood is a distinct developmental stage spanning roughly ages 18 to 25, first proposed by psychologist Jeffrey Jensen Arnett in 2000. It sits between the end of adolescence and the full responsibilities of adult life — and according to Arnett, it is not simply a transition period but a stage with its own defining features, psychological tasks, and inner...

The Cannon-Bard Theory of Emotion: How It Works, Key Concepts & Real-Life Examples

The cannon bard model of emotion, developed by physiologist Walter Cannon and his student Philip Bard in the late 1920s, proposes that emotional experiences and physiological responses happen simultaneously — triggered by the same brain signal, neither one causing the other. When you spot a threat, the fear and the pounding heart arrive at the same moment. This brain-first model...