Erikson, Piaget & Psychology Theories & Concepts Explained

Concrete Operational Stage: Examples, Characteristics & Key Skills (Ages 7–11)

The concrete operational stage is the third of Jean Piaget’s four stages of cognitive development, spanning roughly ages 7 to 11. It marks one of the most significant transitions in childhood cognition: children move from intuitive, appearance-driven thinking to genuinely logical reasoning. The catch is that this logic is tethered to the physical world. Children reason well about things they...

Inner Speech: Vygotsky’s Theory of Thought and Language Development

Inner speech is the silent, internal dialogue that runs through your mind as you plan, reason, and regulate your emotions — and according to Lev Vygotsky, it doesn’t emerge spontaneously. It develops through a systematic process rooted in social interaction, gradually moving inward through childhood. In his landmark work on lev vygotsky thought and language, Vygotsky argued that language doesn’t...

Harlow’s Monkey Experiment: Why Baby Monkeys Chose Touch Over Food

Harlow’s monkey experiment was a landmark series of studies conducted by psychologist Harry Harlow in the 1950s that proved infant attachment is driven by contact comfort—the need for physical touch—not by feeding. Baby rhesus monkeys given a choice between a wire surrogate that provided milk and a soft cloth surrogate that provided none spent up to 18 hours a day...

Prosocial Behavior and Altruism: Definition, Examples & Key Theories

Prosocial behavior is any voluntary action intended to benefit another person or group — whether that means sharing lecture notes with a classmate, donating to a disaster relief fund, or pulling a stranger out of harm’s way. It sits at the center of how psychology understands cooperation, empathy, and moral motivation. While it’s tempting to assume people are naturally inclined...

What Is Gender Socialization? How Society Shapes Gender Roles

Gender socialization is the ongoing process through which people learn their culture’s expectations about gender — what behaviors, emotions, and interests are considered appropriate for boys versus girls, men versus women. It starts before birth, with color-coded nurseries and carefully selected toys, and continues across the entire lifespan. The gender roles we perform aren’t hardwired into us — they’re taught,...

Superego Development: Freud’s Conscience, Guilt, and the Ego Ideal

Superego development is the process by which children internalize moral standards from their environment and build a genuine internal conscience — transforming rules once enforced by others into a moral voice that regulates behavior from within. Freud argued this process begins between ages 3 and 6 through the resolution of Oedipal conflict and identification with the same-sex parent, the defining...