Key Theoretical Perspectives in Developmental Psychology

Section I: Introduction to Developmental Psychology

Overview

Developmental psychology is the scientific study of how and why human beings change over the course of their life. This field examines physical, cognitive, social, and emotional development from infancy through old age.

• Key Focus: Understanding the processes and stages of human growth and development.

• Applications: Education, parenting, mental health, and social policy.

Chapter 2: Theoretical Perspectives

Introduction

This chapter explores major theories that explain how development occurs, including psychodynamic, behavioral, cognitive, and ecological perspectives. Each theory provides a framework for understanding different aspects of human growth.

Freud's Stages of Psychosexual Development

Sigmund Freud proposed that personality develops through a series of childhood stages in which the pleasure-seeking energies of the id become focused on certain erogenous areas. This psychosexual energy, or libido, was described as the driving force behind behavior.

Approximate Age	Focus of Libido	Developmental Task Associated with This Stage
0–12 months	Mouth	Feeding: moving from breast and other forms of milk to solid foods.
12–36 months	Anus	Toilet training: learning to control bodily functions and toilet habits.
36 months–6 years	Genitals	Gender awareness, resolving anxiety by identifying with same-sex parent.
6–12 years	No focus	Period of calm; resolution of previous stages.
12 years onwards	Genitals	Sexual maturity and formation of intimate relationships.

• Key Terms: Libido (psychic energy), psychosexual stages

• Example: A child in the anal stage may become fixated on orderliness or messiness depending on toilet training experiences.

Comparison of Freud and Erikson's Stage Theories

Erik Erikson expanded Freud's theory by emphasizing psychosocial development across the lifespan, focusing on social and cultural influences. Each stage involves a psychosocial crisis that must be resolved for healthy development.

Age of Child	Erikson	Personal Characteristic
Infancy to 12 months	Trust vs mistrust	Hope
12 months to 3 years	Autonomy vs shame	Will
3 to 6 years	Initiative vs guilt	Purpose
6 years to puberty	Industry vs inferiority	Competence
Adolescence	Identity vs role confusion	Fidelity
Young adulthood	Intimacy vs isolation	Love
Middle adulthood	Generativity vs stagnation	Care
Older adulthood	Ego integrity vs despair	Wisdom

• Key Difference: Freud focused on psychosexual stages, while Erikson emphasized psychosocial crises and continued development into adulthood.

• Example: Adolescents face the challenge of developing a sense of identity (Erikson), while Freud's theory would focus on resolving earlier psychosexual conflicts.

Classical Conditioning (Behavioral Perspective)

Classical conditioning is a learning process first described by Ivan Pavlov, in which a neutral stimulus becomes associated with a meaningful stimulus and acquires the capacity to elicit a similar response.

• Unconditioned Stimulus (US): Naturally elicits a response (e.g., food causes salivation).

• Unconditioned Response (UR): Natural reaction to the US (e.g., salivation).

• Conditioned Stimulus (CS): Previously neutral, becomes associated with the US (e.g., bell).

• Conditioned Response (CR): Learned response to the CS (e.g., salivation to bell).

Example: Pavlov's dogs learned to salivate at the sound of a bell after repeated pairings with food.

Equation:

$\text{CS} + \text{US} \rightarrow \text{UR}$ $\text{CS} \rightarrow \text{CR}$

Piaget's Three Mountains Study (Cognitive Perspective)

Jean Piaget's three mountains task assesses egocentrism in children's thinking. Children are asked to describe what a doll sees from a different perspective, testing their ability to understand viewpoints other than their own.

• Egocentrism: Difficulty in seeing the world from another's perspective, typical in the preoperational stage (ages 2–7).

• Key Finding: Young children often describe the scene only from their own viewpoint, not the doll's.

• Application: Demonstrates cognitive development and the gradual decline of egocentrism with age.

Concrete Operations Stage: Main Abilities Learned

During the concrete operational stage (ages 7–11), children develop logical thinking but are still limited to concrete, tangible concepts. They gain abilities such as conservation, classification, and reversibility.

Logical Task	Child is able to convert this...	To this...
Seriation	ACDEFB	ABCDEF
Classification	ABBAABABABA	(AAAAA) (BBBBB)
Reversibility	5 + 5 = 10	Therefore, 10 – 5 = 5

• Seriation: Ability to arrange objects in order (e.g., by size).

• Classification: Ability to group objects by shared properties.

• Reversibility: Understanding that actions can be reversed (e.g., addition and subtraction).

Bronfenbrenner’s Bioecological Theory

Urie Bronfenbrenner’s bioecological model explains development as a result of interactions between individuals and their environmental systems. The model is structured as nested layers, each influencing the individual.

• Microsystem: Immediate environment (family, school, peers).

• Mesosystem: Interconnections between microsystems (e.g., parent-teacher relationships).

• Exosystem: Indirect environments (e.g., parents' workplaces, community services).

• Macrosystem: Broader cultural context (beliefs, values, laws).

• Chronosystem: Changes over time (life transitions, historical events). Additional info: Chronosystem is often included as a temporal dimension in the model.

Example: A child's development is influenced by family relationships, school environment, community resources, and cultural values.