Psychology Notes HQ Editorial Staff, Author at The Psychology Notes Headquarters

The Sensorimotor Stage: How Babies Build Intelligence One Touch at a Time

An eight-month-old watches her mother slide a toy under a blanket. A month earlier, this would have ended the game entirely, out of sight meant gone for good. Instead, she reaches straight for the blanket and pulls it away. That shift in understanding sits at the center of the sensorimotor stage, the opening chapter of Piaget’s theory of cognitive development....

Conservation in Piaget’s Theory: 5 Tasks, Stages & Why Children Fail

Conservation in psychology is the understanding that quantity stays constant even when the appearance of an object changes. It’s one of six cognitive abilities children develop during Piaget’s concrete operational stage (ages 7–11) — the period when logical thinking first takes hold. Before conservation develops, children are routinely misled by how things look: a taller glass seems to hold more...

Cognitive Dissonance Theory: Festinger’s Model & Reduction Strategies

Why do smokers rationalize their habit despite knowing it causes cancer? Why do we justify expensive purchases we later regret? Why do people invested in failing relationships convince themselves everything is fine? Leon Festinger’s cognitive dissonance theory, introduced in 1957, explains these behaviors through one powerful insight: holding contradictory beliefs, attitudes, or behaviors creates psychological discomfort that we are motivated...

Bronfenbrenner’s Ecological Systems Theory: How Your Environment Shapes Who You Are

Bronfenbrenner’s ecological systems theory proposes that human development is shaped not by a single factor, but by five layers of interconnected environments — from your immediate family and classroom all the way to the broader culture you live in. Developed by Urie Bronfenbrenner in the 1970s, this framework is a cornerstone of developmental psychology and a core topic in AP...

Piaget’s Theory of Cognitive Development: Why Kids Think Differently

A four-year-old insists her glass has more juice after it’s poured into a taller cup, even though she watched the whole thing happen. She isn’t confused, and she isn’t being difficult. She is reasoning exactly the way her brain is built to reason at that age. Piaget’s theory of cognitive development is the reason psychologists can explain, and predict, moments...

Havighurst’s Developmental Tasks: Life Stages & Teachable Moments

Havighurst’s developmental tasks theory identifies specific challenges individuals face throughout life stages, from infancy to late adulthood. Robert Havighurst defined developmental tasks as learning challenges that arise at predictable periods, where successful achievement leads to happiness and success with later tasks, while failure results in unhappiness and difficulty. These tasks stem from three sources: physical maturation (learning to walk, puberty),...

Author: Psychology Notes HQ Editorial Staff