Lifespan Development and Theoretical Foundations

1.1 Psychology and Human Development
Learning Objectives

  • Describe differentiations between psychology, lifespan development, and human development.

  • Identify significant research questions in lifespan development.

  • Differentiate various domains within lifespan development.

Case Study: Hosea and Landon

  • Overview: Landon, an 18-year-old facing college decisions.

  • Concerns:

    • Transitioning roles for Landon (father-son dynamic).

    • Worries about college culture and academic pressure.

    • Struggles with identity and peer support systems.

  • Key Themes of Lifespan Development:

    • Psychological processes of transitions.

    • Sample concerns common across toddlers to adults.

    • Variability of experiences in development based on socio-economic status.

Defining the Fields

  • Psychology:

    • Scientific study of the mind and behavior.

    • Recognizes the mind’s central role in human functioning.

  • Lifespan Development:

    • Study of growth, stability, and change from conception to death.

    • Focus on both biological maturation and psychological growth.

  • Human Development:

    • Multidisciplinary approach incorporating various academic disciplines such as sociology, biology, and education.

  • Key Domains of Development:

    • Physical: Changes in body size, proportions, appearance, and motor capacities.

    • Cognitive: Changes in intellectual abilities, including attention, memory, and language.

    • Psychosocial: Changes in emotional communication, self-understanding, and interpersonal relationships.

History of Lifespan Development

  • Child Study Movement:

    • Early 1900s focus on child development interconnecting education, social work, and public policy.

    • Led by figures like G. Stanley Hall, who viewed development as a genetically determined process.

1.2 Themes of Development
Continuous vs. Discontinuous Development

  • Continuous Development:

    • A process of gradually augmenting the same types of skills that were there to begin with.

    • Example: A child adding new words to their vocabulary daily.

  • Discontinuous Development:

    • A process in which new ways of understanding and responding to the world emerge at specific times (stages).

    • Example: The transition from being unable to perform abstract logic to being able to do so during adolescence.

Nature and Nurture Debate

  • Nature: Hereditary information received from parents at the moment of conception.

  • Nurture: Complex forces of the physical and social world that influence our biological makeup and psychological experiences.

  • Stability vs. Plasticity:

    • Stability: Individuals high or low in a characteristic remain so at later ages.

    • Plasticity: Development is open to change in response to influential experiences.

Timing and Periods

  • Critical Periods: Limited time spans during which the individual is biologically prepared to acquire certain adaptive behaviors but needs the support of an appropriately stimulating environment.

  • Sensitive Periods: A time that is optimal for certain capacities to emerge and in which the individual is especially responsive to environmental influences.

1.3 Major Theories and Theorists
Erik Erikson: Psychosocial Development

  • Emphasized that at each stage, the individual faces a Psychosocial Crisis that must be resolved:

    • Trust vs. Mistrust (Birth–1 year)

    • Autonomy vs. Shame and Doubt (1–3 years)

    • Initiative vs. Guilt (3–6 years)

    • Industry vs. Inferiority (6–11 years)

    • Identity vs. Role Confusion (Adolescence)

    • Intimacy vs. Isolation (Early Adulthood)

    • Generativity vs. Stagnation (Middle Adulthood)

    • Integrity vs. Despair (Late Adulthood)

Jean Piaget: Cognitive Development

  • Stage Theory:

    • Sensorimotor: Infants ‘think’ by acting on the world with their eyes, ears, and hands.

    • Preoperational: Preschoolers use symbols to represent their earlier sensorimotor discoveries.

    • Concrete Operational: Reasoning becomes logical and better organized.

    • Formal Operational: Capacity for abstract, systematic thinking enables adolescents to solve problems.

Lev Vygotsky: Sociocultural Theory

  • Focused on how culture—the values, beliefs, customs, and skills of a social group—is transmitted to the next generation.

  • Scaffolding: Guidance provided by a more skilled person to help a child perform a task within their ZPD.

1.4 Contexts and Settings of Development
Ecological Systems Model (Bronfenbrenner)

  • Microsystem: Activities and interaction patterns in the individual's immediate surroundings.

  • Mesosystem: Connections between microsystems (e.g., how home life affects school performance).

  • Exosystem: Social settings that do not contain the developing person but affect experiences in immediate settings (e.g., workplace policies).

  • Macrosystem: Cultural values, laws, customs, and resources.

  • Chronosystem: The element of time; historical changes that influence the other systems.

Cohort Effects

  • Effects due to a person’s time of birth, era, or generation rather than actual age.

  • Example: Technological proficiency differences between Baby Boomers and Gen Z.

1.5 Lifespan Development as a Science: Research Methods
Developmental Research Designs

  • Longitudinal Design: Participants are studied repeatedly, and changes are noted as they get older.

  • Cross-Sectional Design: Groups of people differing in age are studied at the same point in time.

  • Sequential Design: Conducts several similar cross-sectional or longitudinal studies (sequences) at varying times.

Ethical Considerations

  • Informed Consent: Participants must understand the risks and benefits.

  • Privacy: Protecting the identity of participants.

  • Protection from Harm: Ensuring no physical or psychological damage occurs during the study.