HDF-111 Lifespan Human Development Vocabulary

Vocabulary key terms and definitions covering key concepts from Units 1 through 4 of HDF-111.

HDFS

The interdisciplinary study of processes of change and stability across the lifespan, aiming to describe, explain, predict, and intervene when necessary.

Physical Domain

A domain of human development that encompasses the brain, body, physical growth, motor skills, and health.

Cognitive Domain

A domain of human development that encompasses learning, attention, memory, language, reasoning, and creativity.

Psychosocial Domain

A domain of human development that encompasses emotions, personality, and social relations.

Nuclear Family

A household unit consisting of parents and children, which is normative for Western societies.

Extended Family

A multigenerational household structure that is normative for families with Asian and African American lineage.

Socioeconomic Status (SES)

A combination of family income, education levels, and occupation that indirectly affects development through access to resources.

Individualistic Culture

A cultural orientation that prioritizes personal goals and views members as distinct individuals.

Collectivistic Culture

A cultural orientation that prioritizes collective goals and views members in relation to other group members.

Ethnicity

A group identity based on shared culture, ancestry, and national origin.

Race

Socially constructed groupings of people based on physical characteristics or phenotype.

Normative Influences

Biological or environmental experiences that affect people in a given population in similar ways.

Non-Normative Influences

Unusual or uncommon events that disturb the typical sequence of human development.

Critical Period

A specific time during development when the occurrence or absence of an event has a specific impact.

Sensitive Period

A developmental phase during which an individual is especially responsive to certain external experiences.

Plasticity

The capacity of an individual or organ system to adapt and change across the lifespan.

Zone of Proximal Development (ZPD)

In Vygotsky's theory, the gap between what a child can accomplish independently and what they can achieve with guidance.

Scaffolding

Temporary supportive assistance provided by a teacher or peer to help a child master a task.

Microsystem

In Bronfenbrenner's theory, the immediate everyday environment of an individual.

Mesosystem

In Bronfenbrenner's theory, the system of interactions between an individual's distinct microsystems.

Exosystem

In Bronfenbrenner's theory, the interactions between microsystems and broader external institutions.

Macrosystem

In Bronfenbrenner's theory, the overarching cultural values, beliefs, and societal structures.

Chronosystem

In Bronfenbrenner's theory, the dimension of time as it relates to changes in an individual's environment.

Garcia-Coll’s Integrative Model

A developmental model for minority children placing social position factors and social stratification mechanisms at the center of development.

Random Sampling

A selection process where every individual in a population has an equal chance of being chosen to ensure representativeness.

Convenience Sampling

A sampling method selecting participants who are readily available, which saves time but reduces generalizability.

Naturalistic Observation

A research method where participants are observed in real-world settings without researcher intervention.

Case Study

An in-depth research design focusing on a single individual to obtain extensive developmental detail.

Ethnographic Study

An in-depth study of a culture or subculture designed to test the universality of developmental concepts.

Correlational Study

A research design that identifies statistical relationships between variables to enable prediction without establishing causality.

Experiment

A controlled research procedure where an independent variable is manipulated to determine its direct causal effect on a dependent variable.

Cross-Sectional Study

A design where data is collected from individuals of different ages at the exact same point in time.

Longitudinal Study

A design where data is collected from the same individual or cohort repeatedly over an extended period.

Sequential Study

A research strategy combining cross-sectional and longitudinal designs by tracking people of different ages over time.

Fertilization

The biological process by which a sperm and ovum combine to form a single zygote.

Ovulation

The release of an ovum from the ovary, traveling down the fallopian tubes toward the uterus.

In Vitro Fertilization (IVF)

An assisted reproductive technology where ova are surgically removed, fertilized in a laboratory, and implanted into the uterus.

Dizygotic Twins

Fraternal twins resulting from the fertilization of two separate ova by two separate sperm cells.

Monozygotic Twins

Identical twins resulting from a single fertilized egg splitting into two distinct embryos.

Meiosis

Cell division for sex cells where a $46$-chromosome cell splits into two cells containing $23$ chromosomes each.

Mitosis

Cell division in non-sex cells where DNA replicates to form new cells with identical $46$-chromosome structures.

Autosomes

The $22$ pairs of human chromosomes that are not directly involved in sexual expression.

Alleles

Alternative forms of a gene that dictate variations of a specific trait.

Phenotype

The observable physical, anatomical, or behavioral characteristics of an individual.

Genotype

The underlying genetic composition that provides instructions for a phenotype.

Epigenetics

The study of biochemical modifications that alter gene expression without changing the underlying DNA sequence.

Cystic Fibrosis

A genetic disorder characterized by an overproduction of mucus in the lungs and digestive tract, most common among European Americans.

Spina Bifida

A birth defect involving an incompletely closed spinal canal and fluid buildup on the brain, most common among Hispanic families.

Sickle Cell Anemia

A blood disorder causing deformed red blood cells that clog vessels, most common among African American and Hispanic families.

Tay-Sachs Disease

A fatal degenerative disease of the brain and nerve cells causing death before age $5$, most common among Ashkenazi Jewish families.

Klinefelter Syndrome

A chromosomal condition in males characterized by an $(XXY)$ pattern, leading to small testes and learning disorders.

Turner Syndrome

A chromosomal condition in females characterized by an $(XO)$ pattern, leading to short stature, webbed neck, and infertility.

Reaction Range

The potential spectrum of phenotypic expression for a hereditary trait depending on environmental conditions.

Canalization

A measure of the degree to which heredity restricts the variance of expression for specific developmental traits.

Gestation

The period of prenatal development between conception and birth, lasting $37$ to $41$ weeks.

Cephalocaudal Principle

The principle stating that physical development proceeds directionally from the head down to the trunk.

Proximodistal Principle

The principle stating that physical growth proceeds from the center axis of the body outward.

Ectoderm

The outer germ layer of an embryo that forms the skin, hair, and nervous system.

Endoderm

The inner germ layer of an embryo that forms the digestive system, respiratory system, and internal organs.

Mesoderm

The middle germ layer of an embryo that forms the skeletal, muscular, and circulatory systems.

Organogenesis

The period of rapid organ and body system development occurring during the embryonic stage.

Teratogens

External environmental agents, such as drugs, radiation, or viruses, that alter normal prenatal development.

Braxton-Hicks Contractions

False uterine contractions occurring before actual labor begins.

Lamaze Method

An unmedicated birthing approach using breathing techniques, mental imagery, and massage.

Epidural

A local anesthetic injected into the spinal cord to block pain signals during delivery.

Neonatal Period

The first $4$ weeks of life following birth.

Fontanels

The soft spaces on a newborn baby's skull where cranial bones have not yet fused together.

Vernix Caseosa

A protective skin coating on a newborn infant that shields against infections inside the womb.

Anoxia

A condition characterized by a reduced oxygen supply to the infant that can cause brain tissue damage.

Meconium

A stringy, greenish-black waste material excreted by a newborn infant.

Neonatal Jaundice

A condition characterized by yellowing of a newborn's skin and eyes due to an immature liver.

Apgar Scale

A standard newborn assessment given at $1$ and $5$ minutes after birth measuring Appearance, Pulse, Grimace, Activity, and Respiration.

Myelination

The process of encasing neural pathways with a fatty sheath to speed up impulse transmission.

Rooting Reflex

An infant reflex where stroking the cheek causes the baby to turn their head and make sucking movements.

Gross Motor Skills

Physical movement skills involving large body muscles, such as rolling over or crawling.

Fine Motor Skills

Physical movement skills involving small muscle groups, such as picking up small objects or cutting with scissors.

Dynamic Systems Theory (DST)

A theory proposing that motor behavior emerges from the continuous interaction between a child's active traits and their environment.