Lifespan Development

Overview of Lifespan Development

Lifespan development is the scientific study of how humans grow, change, and remain stable throughout their lives, from conception to death. It encompasses physical, cognitive, and social-emotional changes.

• Lifespan development: Studies change and stability across the entire human life, from conception to death.

• Domains of development: Physical, cognitive, and personality/social aspects of human growth.

Domains of Development

Physical, Cognitive, and Social/Personality Development

• Physical development: Involves body, brain, and health.

• Cognitive development: Involves thinking, memory, learning, and language.

• Personality/social development: Involves emotions, relationships, and identity.

Influences on Development

Types of Developmental Influences

• Cohorts: Groups of individuals who experience the same historical or social events.

• Age-graded influences: Developmental changes linked to age, such as puberty and menopause.

• History-graded influences: Changes linked to historical events (e.g., wars, pandemics).

• Sociocultural/ethnic influences: Changes linked to cultural values and customs.

• Non-normative influences: Unique life events that impact development (e.g., winning the lottery, losing a parent).

Theoretical Perspectives in Developmental Psychology

Major Perspectives

• Psychodynamic perspective: Focuses on unconscious forces in human behavior (Freud, Erikson).

• Behavioral perspective: Focuses on observable behaviors and learning (Pavlov, Watson, Skinner).

• Cognitive perspective: Focuses on mental processes such as thinking and memory (Piaget, information-processing theory).

• Humanistic perspective: Emphasizes personal growth and self-actualization (Rogers, Maslow).

• Contextual perspective: Focuses on the relationship between individuals and their environments (Bronfenbrenner, Vygotsky).

• Evolutionary perspective: Focuses on the role of evolution and natural selection in human development (Darwin).

Research Methods in Developmental Psychology

Common Research Designs

• Longitudinal studies: Study the same individuals over a long period.

• Cross-sectional studies: Compare individuals of different ages at one time.

• Sequential studies: Combine longitudinal and cross-sectional designs.

• Other methods: Experiments, case studies, naturalistic observation.

Genetics and Prenatal Development

Genetic Foundations

• Genetics: DNA, chromosomes, and genes determine traits.

• Genotype vs. phenotype: Genotype is genetic makeup; phenotype is observable traits.

• Polygenic inheritance: Traits influenced by multiple genes.

Prenatal Stages and Influences

• Prenatal stages: Germinal (0-2 weeks), embryonic (2-8 weeks), fetal (8 weeks-birth).

• Teratogens: Environmental agents that can harm prenatal development (e.g., drugs, alcohol).

• Fetal Alcohol Spectrum Disorder (FASD): Range of effects caused by maternal alcohol consumption during pregnancy.

Assessment and Birth

Newborn Assessment Tools

• Apgar Scale: Assesses newborn health at 1 and 5 minutes post-birth.

• NBAS (Brazelton Neonatal Behavioral Assessment Scale): Neurological and behavioral assessment tool.

Birth and Postnatal Issues

• Preterm infants: Born before 38 weeks.

• Low birthweight infants: Weigh less than 5.5 lbs.

• Postpartum depression: Affects 10-20% of mothers after childbirth.

Principles of Physical Development

Growth Principles

• Cephalocaudal principle: Development proceeds from head to toe.

• Proximodistal principle: Development proceeds from the center of the body outward.

• Hierarchical integration: Simple skills develop separately and integrate into complex ones.

• Independence of systems: Different body systems grow at different rates.

Brain Development

• Synaptic pruning: Elimination of weaker synaptic connections while strengthening others.

• Myelination: Formation of a fatty sheath around axons to improve signal transmission.

• Plasticity: The brain's ability to change and adapt as a result of experience.

Infant Health and Nutrition

Common Conditions

• SIDS (Sudden Infant Death Syndrome): Unexplained death of an otherwise healthy infant.

• Kwashiorkor: Malnutrition caused by inadequate protein intake.

• Marasmus: Severe malnutrition characterized by energy deficiency.

Developmental Change: Patterns and Periods

Types of Change

• Continuous change: Gradual and cumulative development.

• Discontinuous change: Occurs in distinct steps or stages.

• Critical period: Specific time when certain environmental influences have the greatest impact.

• Sensitive period: Time when an individual is especially responsive to certain experiences, but later learning is still possible.

Learning and Conditioning

Major Learning Theories

• Classical conditioning: Learning through association (Pavlov).

• Operant conditioning: Learning through reinforcement and punishment (Skinner).

• Social-cognitive learning theory: Learning by observing and imitating others (Bandura).

Cognitive Development and Information Processing

Key Theories and Concepts

• Information-processing approach: Development as continuous, involving encoding, storage, and retrieval of information.

• Cognitive neuroscience approaches: Study of brain structures and activity linked to thinking and behavior.

• Piaget's sensorimotor stage: First stage (0-2 years), knowledge built through motor activity and senses.

• Object permanence: Understanding that objects exist even when not seen (8-12 months).

• Deferred imitation: Imitation after a delay, requiring memory (18-24 months).

• Assimilation: Fitting new information into existing mental structures.

• Accommodation: Changing mental structures in response to new information.

• Schema: Organized patterns of thought or behavior.

Memory Types

• Encoding: Process of taking in information.

• Storage: Maintaining information over time.

• Retrieval: Bringing stored information into awareness.

• Implicit memory: Unconscious memory (skills, habits).

• Explicit memory: Conscious recall of facts/events.

• Infantile amnesia: Inability to remember events before ~3 years.

Language Development

Stages and Features

• Language development stages: Crying, cooing (2 months), babbling (6 months), first words (~1 year), telegraphic speech (~2 years).

• Holophrase: Single word used to represent a whole phrase/idea.

• Telegraphic speech: Short, simple combinations of words ("want cookie").

• Infant-directed speech: Slower, higher-pitched, exaggerated speech adults use with babies.

Genetic Disorders and Testing

Common Genetic Disorders

• Down syndrome: Extra chromosome on the 21st pair causing intellectual disability.

• Sickle-cell anemia: Blood disorder producing misshaped red blood cells.

• Tay-Sachs disease: Genetic disorder leading to progressive destruction of the nervous system.

• Fragile X syndrome: Damaged X chromosome leading to cognitive impairment.

• Klinefelter's syndrome: Extra X chromosome in males (XXY), causing underdeveloped genitals and infertility.

Genetic Testing and Counseling

• Genetic counseling: Helping people deal with genetic problems.

• Ultrasound sonography: Imaging technique using sound waves to see the fetus.

• Chorionic villus sampling (CVS): Prenatal test using tissue from the placenta to test for genetic disorders.

• Amniocentesis: Prenatal test sampling amniotic fluid.

Twins and Inheritance

Types of Twins and Inheritance Patterns

• Monozygotic twins: Identical twins from one zygote.

• Dizygotic twins: Fraternal twins from two fertilized eggs.

• Polygenic inheritance: Traits influenced by multiple genes.

Tables

Key Developmental Concepts Table

Additional info:

• Some definitions and examples have been expanded for clarity and completeness.

• Where original notes were fragmented or unclear, standard academic definitions and context have been provided.