Human Growth and Development: Lifespan Perspective and Theories

Chapter 1: Lifespan Perspective

Life-Span Development

Life-span development refers to the continuous pattern of movement or change that begins at conception and continues throughout the entire life span. This perspective emphasizes the dynamic nature of human growth and the factors that influence it.

• Pattern of movement or change: Begins at conception and continues throughout life.

Characteristics of the Lifespan Perspective

• Development is Lifelong: Humans are constantly developing from birth to death.

• Development is Multidimensional: Involves biological, cognitive, and socioemotional dimensions.

• Development is Multidirectional: Individuals experience gains and losses in different domains (e.g., skills, knowledge, physical abilities, social connections).

• Development is Plastic: Refers to the capacity for change. Plasticity decreases with age.

• Development is Contextual: Influenced by historical, economic, social, and cultural factors. Example: The impact of community and displacement in the Story of Africville.

• Development Involves Growth, Maintenance, and Regulation: Integration of knowledge and methods to address complex issues.

• Development is a Co-Construction: Biology, culture, and the individual interact to shape development.

Normative and Non-Normative Influences

• Normative Age-Graded Influences: Similar for people in a similar age group.

• Normative History-Graded Influences: Common to people of a particular generation.

• Non-Normative Life Events: Unanticipated events that affect development.

Life Expectancy and Median Age

• Life Expectancy: The average age a child born in a given year can expect to live. Influenced by contextual factors such as housing, food, water, health care, and economic standing.

• Median Age by Gender: Middle age: Half of the population is older, and half is younger.

Developmental Processes and Periods

Types of Developmental Processes

• Biological: Changes in physical nature.

• Cognitive: Changes in thought, intelligence, and language.

• Socio-emotional: Changes in relationships, emotions, and personality.

The Concept of Age

• Chronological Age: Years since birth.

• Biological Age: Biological health and the functional capacity of vital organs.

• Mental Age: Ability to solve problems compared to others (standardized testing).

• Psychological Age: Adaptive capacities in the same chronological age.

• Social Age: Behavioural, cultural, or psychological traits presumed for one's sex.

Issues in Life-Span Development

Nature and Nurture

• Is development primarily influenced by biological inheritance (nature) or environmental influences and experiences (nurture)?

Continuity and Discontinuity

• Does development involve gradual, cumulative change (continuity) or distinct stages (discontinuity)?

Stability-Change Issues

• Debate about the degree to which early traits and characteristics persist through life or change.

Factors Influencing Development

• Culture: Behavior patterns and products of a group passed from one generation to the next.

• Ethnicity: Cultural heritage including nationality, race, religion, and language.

• Socioeconomic Status (SES): Grouping by occupation, education, and economic characteristics.

• Gender: Traits presumed for one's sex.

Evaluating Developmental Issues

Research Designs

• Roles of nature and nurture, stability and change, and continuity and discontinuity are determined through carefully controlled research designs.

Methods of Collecting Data

• Observation:

  • Systematic: Know who, when, and where to observe; how results will be recorded.

  • Laboratory: Controlled setting for research.

  • Naturalistic: Observing behaviors in real-world settings.

• Survey and Interview: Asking questions to collect information.

• Standardized Test: Uniform procedures for administration and scoring.

• Case Study: In-depth examination of an individual.

• Psychological Measures: Study of development at different points in the lifespan (e.g., neuroimaging, cortisol, heart rate).

Quantitative Research Designs

• Correlational Research: Examines the strength of the relationship between two or more events/characteristics.

• Experimental Designs: Used to determine causality.

Experimental Research

• Manipulate one or more variables and observe effects on behavior; other variables held constant.

• Independent Variable: Variable that is manipulated.

• Dependent Variable: Variable that changes in response to the independent variable.

• Experimental & Control Groups: Experimental group receives the treatment; control group does not.

• Random Assignment (RCT): Strongest research design.

The Time of Research

• Cross-Sectional Approach: Individuals of different ages are compared at one time.

• Longitudinal Approach: The same individuals are studied over a period.

• Sequential Approach: Combines cross-sectional and longitudinal designs.

• Cohort Effects: Due to a person's time of birth or generation, not actual age.

Theories of Development

Psychoanalytic Theory

Sigmund Freud (1856-1939) emphasized the unconscious processes in development. Early experiences and emotions play a significant role in shaping behavior.

• Development is primarily unconscious.

• Emotions heavily influence development.

• Early experiences with parents shape development.

• Symbolic meanings of behavior are analyzed.

• Stages of development are known as psychosexual stages.

Erikson's Psychosocial Theory

Erik Erikson (1902-1994) proposed that the primary motivation for behavior is social. Developmental change occurs throughout the lifespan.

• Eight stages of psychosocial development, each with a unique challenge.

• Successful resolution leads to healthy development.

Erikson's Stage	Developmental Period	Key Challenge
Trust vs. Mistrust	Infancy (first year)	Trust in caregivers
Autonomy vs. Shame/Doubt	Toddlerhood (1-3 years)	Independence
Initiative vs. Guilt	Early childhood (3-5 years)	Initiative in activities
Industry vs. Inferiority	Middle/late childhood (6-puberty)	Mastery of knowledge and skills
Identity vs. Role Confusion	Adolescence (10-20 years)	Sense of self
Intimacy vs. Isolation	Early adulthood (20s, 30s)	Forming intimate relationships
Generativity vs. Stagnation	Middle adulthood (40s, 50s)	Helping next generation
Integrity vs. Despair	Late adulthood (60s+)	Reflection on life

Other Theories of Development

• Cognitive Theory

• Behavioural & Social Cognitive Theories

• Ethological Theory

• Humanist Approach

• Bronfenbrenner's Bioecological Theory

• Contemporary Theories and Approaches

Summary

• Contextual factors play a fundamental role in growth and development.

• Development occurs across the lifespan and is influenced by age, culture, SES, education, gender, and other factors.

• Research designs help us understand the roles of nature vs. nurture, continuity vs. discontinuity, and stability vs. change.

• Major theories of development provide frameworks for understanding human growth.