Human Development

Learning Objective: Describe major developmental theories and stages

Your Stage Right Now

You are 15, 16, or 17 years old -- right in the middle of one of the most fascinating and challenging stages of human development: adolescence. Your brain is rewiring itself, your identity is forming, and you are starting to think about abstract ideas like justice, love, and your future in ways you could not as a child. Understanding developmental psychology helps you make sense of what you are going through.

What is Human Development?

Human development in psychology refers to the physical, cognitive, emotional, and social changes that occur throughout a person's lifespan -- from conception to death. Developmental psychologists study how and why people change over time.

Development follows general patterns but is influenced by both biological maturation (nature) and environmental experiences (nurture). Two of the most influential developmental theorists are Jean Piaget and Erik Erikson.

Piaget's Theory of Cognitive Development

Swiss psychologist Jean Piaget (1896--1980) proposed that children's thinking develops through four distinct stages:

1. Sensorimotor Stage (birth to 2 years) -- Infants learn about the world through their senses and actions. A key milestone is object permanence -- understanding that objects continue to exist even when hidden. Before this develops, a baby believes a toy that is covered no longer exists.

2. Preoperational Stage (2--7 years) -- Children develop language and imagination but struggle with logic. They are egocentric -- unable to see things from others' perspectives. They also lack conservation -- they may think a tall, thin glass holds more water than a short, wide one, even when both contain the same amount.

3. Concrete Operational Stage (7--11 years) -- Children develop logical thinking about concrete (physical) objects. They master conservation and can classify objects. However, they struggle with abstract or hypothetical thinking.

4. Formal Operational Stage (12 years and up) -- Adolescents develop the ability to think abstractly, hypothetically, and systematically. You can now consider "what if" scenarios, think about philosophical questions, and plan for the future. This is the stage most of you are in right now -- which is why you can engage with complex subjects like political theory and literary analysis.

Erikson's Psychosocial Development

German-American psychologist Erik Erikson (1902--1994) proposed that personality develops through eight stages across the lifespan, each involving a psychosocial crisis that must be resolved:

| Stage | Age | Crisis | Description | |-------|-----|--------|-------------| | 1 | 0--1 | Trust vs. Mistrust | Infants learn to trust (or mistrust) caregivers | | 2 | 1--3 | Autonomy vs. Shame | Toddlers develop independence | | 3 | 3--6 | Initiative vs. Guilt | Children begin to assert control | | 4 | 6--12 | Industry vs. Inferiority | Children master skills and competence | | 5 | 12--18 | Identity vs. Role Confusion | Adolescents explore identity | | 6 | 18--40 | Intimacy vs. Isolation | Young adults form deep relationships | | 7 | 40--65 | Generativity vs. Stagnation | Adults contribute to society | | 8 | 65+ | Integrity vs. Despair | Elders reflect on life |

Stage 5 -- Identity vs. Role Confusion is where you are right now. Erikson argued that the central task of adolescence is answering the question: "Who am I?" You are experimenting with different roles, values, beliefs, and friendships to form a coherent identity. Successfully navigating this stage leads to a strong sense of self; failure leads to confusion about one's place in the world.

Adolescent Psychology

Adolescence is marked by rapid changes:

• Brain development -- the prefrontal cortex (responsible for planning, decision-making, and impulse control) is still developing until around age 25. This explains why adolescents may take more risks and act on impulse.
• Identity formation -- exploring personal values, career interests, political beliefs, and social identity
• Peer influence -- friends become increasingly important, sometimes more influential than parents
• Emotional intensity -- hormonal changes and brain development make emotions feel more intense

In Nepal, adolescence is shaped by specific cultural factors: expectations around academic performance (especially SEE results), family obligations, early discussions about marriage in some communities, and the pressure of choosing a career path at a young age.

Think Critically

Erikson says adolescents are forming their identity by trying different roles. How does the pressure of the Nepali education system -- choosing a stream right after SEE -- affect this process of identity exploration?

Summary

• Human development spans the entire lifespan, involving physical, cognitive, emotional, and social changes.
• Piaget identified four stages of cognitive development: sensorimotor, preoperational, concrete operational, and formal operational (your current stage).
• Erikson proposed eight psychosocial stages; adolescents face the Identity vs. Role Confusion crisis.
• Adolescent brain development is ongoing, with the prefrontal cortex not fully maturing until around age 25.