Understanding Human Development: Approaches and Theories

Characteristics of Lifespan Human Development

• Development is Multidimensional: It involves the complex interaction of various domains that change throughout an individual's life:

  • Physical development: Changes in body size, proportions, appearance, and the functioning of body systems.
  • Cognitive development: Changes in intellectual abilities, including attention, memory, academic and everyday knowledge, problem-solving, imagination, creativity, and language.
  • Socioemotional development: Changes in emotional communication, self-understanding, knowledge about other people, interpersonal skills, friendships, intimate relationships, and moral reasoning and behavior.

• Development is Multidirectional: Development is not a simple linear progression of improvement; it involves both growth and decline throughout the lifespan:

  • Gains and losses in development: At every period, individuals experience both improvements and declines in various abilities.
  • Developmental plasticity: The capacity for change and the ability to be molded by experience; this capacity exists throughout the lifespan but can vary in degree.
  • Developmental resilience: The ability to adapt effectively in the face of threats to development or adverse conditions.

• Development is Influenced by Multiple Contexts: Individuals develop within a complex system of surrounding environments.

  • Sociohistorical Context:
    • Age-graded influences: Events or influences that are strongly related to age and therefore fairly predictable in when they occur and how long they last (e.g., starting school, puberty, or retirement).
    • History-graded influences: Forces unique to a particular historical era that explain why people born around the same time (cohorts) tend to be alike in ways that set them apart from people born at other times (e.g., pandemics, wars, or technological revolutions).
    • Cohort definition: A group of people born at around the same time in the same place who move through life together.
    • Non-formative influences: Irregular, unpredictable events that happen to just one person or a few people and do not follow a predictable timeline.

• Cultural Context:

  • Culture definition: The system of shared beliefs, values, customs, behaviors, and artifacts that the members of society use to cope with their world and with one another.
  • Cross-cultural research: Comparing individuals from different cultural groups to identify universal versus culture-specific developmental patterns.
  • Cultural research: Studying development within the specific context of a culture to understand how cultural practices shape individual lives.

• Developmental Science is Multidisciplinary: Understanding development requires contributions from many interrelated fields, including psychology, sociology, anthropology, biology, and neuroscience.

  • Cognitive development example: Research in this area often requires insights from neuroscience (brain structure), psychology (behavior), and education.

Basic Issues in Lifespan Human Development

• Continuous and Discontinuous Change:

  • Continuous change: A process of gradually augmenting the same types of skills that were there to begin with; development is viewed as a smooth, cumulative process.
  • Discontinuous change: A process in which new ways of understanding and responding to the world emerge at specific times; development is viewed as occurring in distinct stages or abrupt shifts.

• Individuals Are Active in Development: Modern developmental science emphasizes that individuals are not merely passive recipients of environmental influence; they actively play a role in their own development by interacting with and changing their environments.

• Nature and Nurture Influence Development:

  • Nature–nurture debate: The historical controversy over whether genetic inheritance (nature) or environmental factors (nurture) are more important as determinants of development.
  • Combined effects: Modern researchers recognize that nature and nurture are inextricably linked and work together to shape development; it is no longer about which one is responsible, but how they interact.

Theoretical Perspectives: Psychoanalytic and Behavioral Theories

• Psychoanalytic Theories: Freud’s Psychosexual Theory:

  • Sigmund Freud is considered the father of the psychoanalytic perspective.
  • He proposed a progression through psychosexual stages (oral, anal, phallic, latency, genital), where children move through a series of stages in which they confront conflicts between biological drives and social expectations.
  • He placed heavy emphasis on the permanent impact of early family experiences.
  • Freud's theory is currently considered unpopular or less influential in modern empirical science because it overemphasized sexuality and was difficult to test.

• Psychoanalytic Theories: Erikson’s Psychosocial Theory:

  • Erik Erikson built upon Freud's work but placed less emphasis on unconscious motivators and sexual drives.
  • He proposed a progression through eight psychosocial stages, each characterized by a unique developmental task or crisis.
  • Development is driven by biological maturation and social demands.
  • Unlike Freud, Erikson’s theory has implications throughout the entire life, extending into late adulthood.

• Behaviorist and Social Learning Theories: Classical Conditioning:

  • Classical conditioning definition: A learning process that occurs when two stimuli are repeatedly paired; a response which is at first elicited by the second stimulus is eventually elicited by the first stimulus alone.
  • Ivan Pavlov’s experiments: Demonstrated classical conditioning through physiological responses (e.g., dogs salivating at the sound of a bell).
  • Classical conditioning in newborns: Foundations of learning can be seen in infants' reflex-like responses to environmental cues.

• Behaviorist and Social Learning Theories: Operant Conditioning:

  • Operant conditioning definition: A method of learning that occurs through rewards and punishments for behavior.
  • Reinforcement: Any consequence that increases the likelihood of a behavior being repeated (can be positive or negative).
  • Punishment: Any consequence that decreases the likelihood of a behavior being repeated.

• Behaviorist and Social Learning Theories: Social Learning Theory:

  • Social learning theory definition: Albert Bandura's theory that emphasizes the importance of observing and modeling the behaviors, attitudes, and emotional reactions of others.
  • Observational learning: Learning that occurs by watching others without direct experience.
  • Reciprocal determinism: The concept that development results from an ongoing, bidirectional interaction between an individual's behavior, their internal characteristics (personal factors), and the environment.

Theoretical Perspectives: Cognitive, Contextual, and Evolutionary

• Cognitive Theories:

  • Piaget’s Cognitive-Developmental Theory: Proposed that children actively construct knowledge as they manipulate and explore their world.
  • Cognitive schemas: Managed mental structures used to organize and interpret information.
  • Information processing theory: Views the human mind as a symbol-manipulating system through which information flows.
  • This theory suggests an innate ability to process information that improves with age and experience.

• Contextual Theories:

  • Vygotsky’s sociocultural theory: Focuses on how culture—the values, beliefs, customs, and skills of a social group—is transmitted to the next generation through social interaction.
  • Bronfenbrenner’s bioecological systems theory: Views the person as developing within a complex system of relationships affected by multiple levels of the surrounding environment (microsystem, mesosystem, exosystem, macrosystem, and chronosystem).
  • Dynamic systems theory: Views development as a web of fibers that are constantly reorganizing; the child's mind, body, and physical and social worlds form an integrated system that guides mastery of new skills.

• Ethology and Evolutionary Developmental Theory:

  • Ethology definition: The study of human behavior and social organization from a biological and evolutionary perspective.
  • Biologically preprogrammed behaviors: Suggests that some behaviors are innate and have been selected for because they promote survival.
  • Evolutionary developmental theory: Seeks to understand the adaptive value of species-wide cognitive, emotional, and social competencies as those competencies change with age.
  • It acknowledges the influence of contextual factors on how evolutionary traits are expressed.

Research in Human Development

• The Scientific Method:

  1. Hypothesize: Formulate a testable prediction based on theory or prior research.
  2. Gather information: Conduct the research according to specific methods.
  3. Analyze results: Use statistical methods to determine the significance of the data.
  4. Interpret results: Relate the findings back to the original hypothesis and theory.

• Methods of Data Collection: Observational Measures:

  • Naturalistic observation: Recording behavior in natural settings without intervention.
  • Structured observation: Recording behavior in a controlled laboratory setting where the researcher sets up a situation to evoke the behavior of interest.

• Methods of Data Collection: Self-Report Measures:

  • Open-ended interview: A conversation where researchers ask questions in a flexible way to understand the participant's unique perspective.
  • Structured interview: Each participant is asked the same set of questions in the same way.
  • Questionnaires: Written sets of questions used to gather data from large numbers of people efficiently.

• Methods of Data Collection: Physiological Measures: Examining the relationship between biological processes and behavior using advanced technology:

  • Electroencephalography (EEG).
  • Computerized tomography (CT).
  • Positron emission tomography (PET).
  • Functional magnetic resonance imaging (fMRI).
  • Diffusion tensor imaging (DTI).

Research Designs

• Case Study:

  • An in-depth examination of a single individual or a small group.
  • Gathers information from many sources (e.g., records, interviews, observations).
  • Often serves as a source of hypotheses for future larger-scale studies.

• Correlational Research:

  • Examines relations among measured characteristics.
  • Does not determine causes; correlation does not imply causation.

• Experimental Research:

  • Tests causal hypotheses by manipulating variables in a controlled environment.
  • Dependent variables ($DV$): The behavior or outcome that is measured and expected to change.
  • Independent variables ($IV$): The factor that is manipulated by the researcher.
  • Random assignment: Used to ensure participants have an equal chance of being assigned to any group, reducing bias.

• Developmental Research Designs:

  • Cross-sectional research design: Comparing groups of people of different ages at one point in time.
  • Longitudinal research design: Following the same group of participants over an extended period to measure change over time.
  • Sequential research design: A combination of cross-sectional and longitudinal designs, following several cohorts over several years.

Research Ethics, Applied Science, and Intersectionality

• Principles of Research Ethics:

  • Do good and avoid harm (Beneficence and Non-maleficence).
  • Responsibility: Adherence to professional and scientific standards.
  • Integrity: Accuracy, honesty, and truthfulness in research.
  • Justice: Fairness in distribution and access to the benefits of research.
  • Respect for autonomy: Protecting the rights and dignity of participants.

• Ethical Issues in Studying Lifespan Development:

  • Informed consent: Participants must be aware of the research purpose and risks.
  • Passive consent: Sometimes used in schools where a parent must sign only if they do NOT want their child to participate (though this is controversial).
  • Confidentiality: Protecting the identity and data of participants.
  • Balancing conflicting obligations: Negotiating the needs of the science versus the rights of the individual.

• Applied Developmental Science:

  • Definition: The application of developmental research and theory to real-world issues.
  • Purpose: Promoting healthy development across the lifespan.
  • Addresses systemic disparities in opportunities that affect developmental outcomes.

• Intersectionality and Development:

  • Intersectionality definition: A framework for understanding how various social and political identities (e.g., race, class, gender, sexuality) overlap.
  • Multiple converging identities: Individuals are shaped by the combination of their various demographic markers.
  • Dimensions of power or oppression: Some identities provide privilege while others lead to systemic disadvantage.
  • Sociocultural contextual influences: These overlapping identities create unique contexts for development.