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Developmental Science
A field of study devoted to understanding constancy and change throughout the lifespan
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Theory
An orderly, integrated set of statements that describes, explains, and predicts behavior
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What do theories provide
They provide organizing frameworks for our observations of people
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What does a theory's continued existence depend on?
Scientific verification
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Continuous Development
A process of gradually augmenting the same types of skills that were there to begin with
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Discontinuous Development
A process in which new ways of understanding and responding to the world emerge at specific times
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Stages in discontinuous development
Qualitative changes in thinking, feeling, and behaving that characterize specific periods of development
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Contexts
Unique combinations of personal and environmental circumstances that can result in different paths of change
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What do different circumstances foster?
Different intellectual capacities, social skills, and feelings about the self and others
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What is the nature-nurture controversy?
Are genetic or environmental factors more important
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Plasticity
Open to change in response to influential experiences
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Dynamic System
A perpetually ongoing process, extending from conception to death, that is molded by a complex network of biological, psychological, and social influences
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Lifespan Perspective
Development is lifelong, multidimensional and multidirectional, highly plastic, and affected by multiple, interacting forces
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What perspective believes that no single age period is supreme in its impact on the life course?
Lifespan Perspective
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What are the major periods of human development?
- Prenatal- conception to birth
- Infancy and toddlerhood- birth to 2 years
- Early childhood- 2 to 6 years
- Middle childhood- 6 to 11 years
- Adolescence- 11 to 18 years
- Early adulthood- 18 to 40 years
- Middle adulthood- 40 to 65 years
- Late adulthood- 65 to death
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What can people of all ages improve?
Current skills and develop new ones, including skills that compensate for reduced functioning
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Resilience
The ability to adapt effectively in the face of threats to development
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Age-graded Influences
Events that are strongly related to age and therefore fairly predictable in when they occur and how long they last
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History-graded Influences
Explain why people born around the same time-called a cohort-tend to be alike in ways that set them apart from people born at other times
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Nonnormative Influences
Events that are irregular: They happen to just one person or a few people and do not follow a predictable timetable
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G. Stanley Hall
Founder of the child study movement
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Maturational Process
A genetically determined series of events that unfold automatically, much like a flower
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Normative Approach
Measures of behavior are taken on large numbers of individuals, and age-related averages are computed to represent typical development
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Who was the first to make to make knowledge about child development meaningful to parents by informing them of what to expect at each age?
Gesell
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Who constructed the first successful intelligence test?
Simon and Binet
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Psychoanalytic Theory
People move through a series of stages in which they confront conflicts between biological drives and social expectations How these conflicts are resolved determines the person's ability to learn, to get along with others, and to cope with anxiety
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Psychosexual Theory
Emphasizes how parents manage their child's sexual and aggressive drives in the first few years is crucial for healthy personality development
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What did Freud believe the relations established among the id, ego, and superego during the preschool years determine?
The individual's basic personality
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Who's theory was the first to stress the influence of the early child-parent relationship on development?
Freud
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What was wrong with Freud's theory?
It overemphasized the influence of sexual feelings in development, it was based on the problems of sexually, repressed, well-to-do adults in nineteenth-century Viennese society, didn't apply to other cultures, and he didn't study children directly
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Psychosocial Theory
Erikson emphasized that in addition to mediating between id impulses and superego demands, the ego makes a positive contribution development, acquiring attitudes and skills that make the individual an active, contributing member of society
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What are Freud's stages?
- Oral: Birth-1 year
- Anal: 1-3 years
- Phallic: 3-6 years
- Latency: 6-11 years
- Genital: Adolescence
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What are Erikson's stages?
- Basic trust verses mistrust: birth to 1 year
- Autonomy verses shame and doubt: 1-3 years
- Initiative verses guilt: 3-6 years
- Industry verses inferiority: 6-11 years
- Identity verses role confusion: Adolescence
- Intimacy verses isolation: early adulthood
- Generativity verses stagnation: middle adulthood
- Integrity verses despair: old age
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Behaviorism
Directly observable events--stimuli and responses--are the appropriate focus of study
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Who discovered classical conditioning?
Pavlov
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What did Watson conclude about environment due to the Albert experiment?
Environment is the supreme force in development and that adults can mold children's behavior by carefully controlling stimulus-response associations
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How did Watson view development?
As a continuous process--a gradual increase with age in the number and strength of these associations
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Operant conditioning theory
Skinner believed that the frequency of a behavior can be increased by following it with a wide variety of reinforcers or decreased through punishments
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Social learning theory
The most influential, Albert Bandura, emphasizing modeling, also known as imitation or observational learning, as a powerful source of development
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Behavior modification
Consists of procedures that combine conditioning and modeling to eliminate undesirable behaviors and increase desirable responses
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Cognitive-developmental theory
Children actively construct knowledge as they manipulate and explore their world
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What are Piaget's stages?
- Sensorimotor: birth to 2 years
- Preoperational: 2-7 years
- Concrete operation: 7-11 years
- Formal operation: 11 years on
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Information processing theory
The human mind might also be viewed as a symbol-manipulating system through which information flows
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How does information processing theory view development?
Continuous
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Developmental cognitive neuroscience
Brings together researchers from psychology, biology, neuroscience, and medicine to study the relationship between changes in the brain and the developing person's cognitive processing and behavior patterns
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Ethology
Concerned with the adaptive, or survival, value of behavior and its evolutionary history
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Critical period
A limited time span during which the individual is biologically prepared to acquire certain adaptive behaviors but need the support of an appropriately stimulating environment
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Sensitive period
A time that is optimal for certain capacities to emerge in which the individual is especially responsive to environmental influences. It's boundaries are less well-defined than those of a critical period. Development can occur later, but it is harder to induce
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Who applied ethological theory to the understanding of the human infant-caregiver relationship?
John Bowlby
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Evolutionary developmental psychology
Seeks to understand the adaptive value of specieswide cognitive, emotional, and social competencies as those competencies change with age
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What does evolutionary development aim to understand?
The person-environment system throughout the lifespan
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Sociocultural Theory
Focuses on how culture--the values, beliefs, customs, and skills of a social group--is transmitted to the next generation
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What did Vygotsky's believe?
That as adults and more expert peers help children master culturally meaningful activities, the communication between them becomes part of children's thinking
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Ecological systems theory
Views the person as developing within a complex system of relationships affected by multiple levels of the surrounding environment
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Microsystem
Innermost level of the environment and consists of activities and interaction patterns in the person's immediate surroundings
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Mesosystem
The second level of Brofenbrenner's model that encompasses connections between microsystems
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Exosystem
Consists of social settings that do not contain the developing person but nevertheless affect experiences in immediate settings
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Macrosystem
The outermost level and consists of cultural values, laws, customs, and resources
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Ecological transitions
The shifts in contexts--ecological transitions--are often important turning points in development
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Chronosystem
The temporal dimension of Brofenbrenner's model
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What do psychoanalytic perspective and ethology emphasize?
Emotional and social development
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What theories stress changes in thinking?
Cognitive-developmental theory, information processing, and sociocultural theory
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Research methods
The specific activities of participants
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Research designs
Overall plans of research studies that permit the best possible test of the investigator's hypothesis
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Structured Observations
The investigator sets up a laboratory situation that evokes the behavior of interest so that every participant has equal opportunity to display the response
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Naturalistic Observation
Go into the field, or natural environment, and record the behavior of interest
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Clinical Interview
Researchers use a flexible, conversational style to probe for the participant's point of view
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Structured Interviews
Each participant is asked the same set of questions in the same way
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Clinical, or case study, method
Brings together a wide range of information on one person, including interviews, observations, and test scores
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Ethnography
Like the clinical method, ethnographic research is a descriptive, qualitative technique. But instead at aiming to understand a single individual, it is directed toward understanding a culture or a distinct social group through participant observation
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Correlational Design
Researchers gather information on individuals, generally in natural life circumstances, without altering their experiences. Then they look at relationships between participants' characteristics and their behavior or development
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Correlation coefficient
A number that describes how two measures, or variables, are associated with each other
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Experimental design
Permits inferences about cause and effect because researchers use an evenhanded procedure to assign people to two or more treatment conditions
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Independent variable
The one the investigator expects to cause change in another variable
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Dependent variable
The one the investigator expects to be influenced by the independent variable
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Random assignment
An unbiased procedure, such as drawing numbers out of a hat or flipping a coin, investigators increase the chances that participants' characteristics will be equally distributed across treatment groups
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Field experiments
Investigators capitalize on opportunities to assign participants randomly to treatment conditions in natural settings
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Longitudinal design
Participants are studied repeatedly, and changes are noted as they get older
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Cohort effects
Individuals born in the same time period are influenced by a particular set of historical and cultural conditions. Results based on one cohort may not apply to people developing at other times
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Cross-sectional design
Groups of people differing in age are studied at the same point in time
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Sequential designs
They conduct several similar cross-sectional or longitudinal studies
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What are the participants' rights?
Protection from harm, informed consent, privacy, knowledge of results, beneficial treatments
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Institutional review boards (IRB)
Weigh the costs of the research to participants in terms of inconvenience and possible psychological or physical injury against the study's value for advancing knowledge and improving conditions of life
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Debriefing
The investigator provides a full account and justification of the activities once the research session is over
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Chromosomes
Rodlike structures which store and transmit genetic information
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Deoxyribonucleic acid (DNA)
The chemical that chromosomes are made up of
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Gene
A segment of DNA along the length of the chromosome
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Mitosis
A unique feature of DNA is that it can duplicate itself
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Gamates
Sex cells, and sperm and ovum
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Meiosis
A cell division process in which gametes are formed. It halves the number of chromosomes normally present in body cells.
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Zygote
When sperm and ovum unite at conception result in a cell called Zygote
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How many sperm and ovum are there after meiosis?
4 sperm, 1 ovum
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Autosomes
22 out of 23 chromosomes are matching pairs
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Sex chromosomes
The 23 third pair
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Dizygotic twins
Fraternal, the most common type of multiple offspring, resulting from the release and fertilization of two ova
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Monozygotic twins
Identical, a zygote that has started to duplicate separates into two clusters of cells that develop into two individuals. They have the same genetic makeup
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Allele
Two forms of each gene occur at the same place on the chromosomes, one inherited from the mother and one from the father
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Homozygous
If the alleles from both parents are alike they will display the inherited trait
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Heterozygous
If the alleles differ the relationships between the alleles determine the phenotype
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Dominant-recessive inheritance
Only one allele affects the child's characteristics. It is called dominant; the second allele, which has no effect, is called recessive
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Carriers
Heterozygous individuals with just one recessive allele can pass that trait to their children
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Incomplete dominance
A pattern of inheritance in which both alleles are expressed in the phenotype, resulting in a combined trait, or one that is intermediate between the two
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X-linked inheritance
When a harmful allele is carried on the x chromosome
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Genomic imprinting
Alleles are imprinted, or chemically marked, so that one pair member (either the mother's or the father's) is activated, regardless of its makeup
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Mutuation
A sudden but permanent change in a segment of DNA
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Polygenic inheritance
Many genes influence the characteristic in question
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Genetic counseling
A communication process designed to help couples assess their chances of giving birth to a baby with a hereditary disorder and choose the best course of action in view of risks and family goals
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Donar insemination
Injection of sperm from an anonymous man into a woman
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In vitro fertilization
A woman is given hormones that stimulate the ripening of several ova. These are removed surgically and placed in a dish of nutrients, to which sperm is added. Once ovum is fertilized and begins to duplicate into several cells, it is injected into the mother's uterus
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Surrogate motherhood
In vitro fertilization may be used to impregnate a woman with a couple's fertilized ovum
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Prenatal diagnostic methods
Medical procedures that permit detection of developmental problems before birth
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Gene therapy
Correcting genetic abnormalities by delivering DNA carrying a functioning gene to the cells
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Proteomics
Scientists modify gene-specified proteins involved in biological aging and disease
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Coparenting
Mutually supporting each other's parenting behaviors
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Socioeconomic status
Researchers assess a family's standing by looking at years of education, prestige of one's job and the skills it requires, and income
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Subcultures
Groups of people with beliefs and customs that differ from those of the larger culture
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Extended-family households
Three or more generations live together
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Collectivist societies
People define themselves as part of a group and stress group goals over individual goals
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Individualistic societies
People think of themselves as separate entities and are largely concerned with their own personal needs
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Public policies
laws and government programs designed to improve current conditions
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Behavioral genetics
A field devoted to uncovering the contributions of nature and nurture to this diversity in human traits and abilities
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Heritability estimates
measure the extent to which individual differences in complex traits in a specific population are due to genetic factors
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Kinship studies
Compare the characteristics of family members
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Gene-environment interaction
Because of their genetic makeup, individuals differ in their responsiveness to qualities of the environment. People have unique, genetically influenced reactions to particular experiences
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Canalization
The tendency of heredity to restrict the development of some characteristics to just one or a few outcomes
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Gene-environment correlation
Our genes influence the environments to which we are exposed
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Niche-picking
Tendency to actively choose environments that complete our heredity
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Epigenesis
Development resulting from ongoing, bidirectional exchanges between heredity and all levels of the environment
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Ovaries
Two walnut-sized organs located deep inside her abdomen
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Fallopian tubes
Long, thin structures that lead to the hollow, soft-lined uterus
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Corpus luteum
The spot on the ovary from which the egg is released
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Testes
Two glands located in the scrotum, sacs that lie just behind the penis
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Cervix
Opening of the uterus
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Period of the Zygote
Lasts about two weeks from fertilization until the tiny mass of cells drifts down and out of the fallopian tube and attaches itself to the wall of the uterus
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Blastocyst
60-70 cells exist to form a hollow, fluid-filled ball
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Embryonic disk
The cells on the inside that become the new organism
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Trophoblast
The outer ring of cells become the structures that provide protective covering and nourishment
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Implantation
Between the 7th and 9th day the blastocyst burrows deep into the uterine lining
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Amnion
A membrane that encloses the developing organism in amniotic fluid, which helps keep the temperature of the prenatal world constant and provides a cushion against any jolts caused by the woman's movements
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Chorion
Surrounds the amnio. From the chorion, tiny hairlike villi, or blood vessels, emerge
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Placenta
Permits food and oxygen to reach the organism and waste products to be carried away
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Umbilical cord
Contains one large vein that delivers blood loaded with nutrients and two arteries that remove waste products
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Period of the Embryo
Lasts from implantation to the 8th week of pregnancy. The most rapid prenatal changes take place as the groundwork is laid for all body structures and internal organs
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Ectoderm
Will become the nervous system and skin
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Mesoderm
Will develop the muscles, skeleton, circulatory system, and other internal organs
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Endoderm
Will become the digestive system, lungs, urinary tract, and glands
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Neural tube
Primitive spinal cord
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Neurons
Nerve cells that store and transmit information
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Period of the Fetus
9th week to the end of pregnancy is the longest prenatal period
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When does the genitals form?
12th week
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Trimesters
Prenatal development divided into three equal time periods
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Vernix
A white cheese-like substance protects its skin from chapping during the long months spent bathing in the amniotic fluid
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Lanugo
White downy hair appears over the entire body, helping the vernix stick to the skin
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Glial cells
Support and feed the neurons
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Age of viability
The point at which the baby can first survive is between 22 and 26 weeks
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Cerebral cortex
Seat of human intelligence
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Teratogen
Any environmental agent that causes damage during the prenatal period
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When serious defects are mostly likely to occur during which prenatal stage?
Embryonic period
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Fetal alcohol spectrum disorder (FASD)
Encompasses a range of physical, mental, and behavioral outcomes caused by prenatal alcohol exposure
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Fetal alcohol syndrom (FAS)
Distinguished by slow physical growth, a pattern of three facial abnormalities (short eyelid openings; a thin upper lip; a smooth or flatted philtrum, or indentation running from the bottom of the nose to the center of the upper lip), brain injury evident in a small head and impairment in at least three areas of functioning
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Partial fetal alchohol syndrom (p-FAS)
Two of the three facial abnormalities, brain injury in at least three areas of impaired functioning
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Alcohol-related neurodevelopment disorder (ARND)
At least three areas of mental functioning are impaired, despite typical psychical growth and absence of facial abnormalities
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What does maternal emotional stress during pregnancy predict?
Childhood weakened immune system functioning and increased susceptibility to infectious disease
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Rh factor incompatibly
When the mother is Rh-negative and the father Rh-positive, the baby may inherit the father's Rh-positive blood type. If even a little of the fetus's Rh-positive blood crosses the placenta into the Rh-negative mother's bloodstream, she begins to form antibodies to the foreign Rh protein. If these enter the fetus's system, they destroy red blood cells, reducing the oxygen supply to organs and tissues
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Preeclampsia
Sometimes called toxemia, blood pressure increases sharply and the face, hands, and feet swell in the last half of pregnancy
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Apgar scale
To assess the newborn's physical condition quickly
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Natural, or prepared, childbirth
A group of techniques aimed at reducing pain and medical intervention and making childbirth a rewarding experience
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Anoxia
Inadequate oxygen supply
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Breech position
Turned so that the buttocks or feet would be delivered first
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Fetal monitors
Electronic instruments that track the baby's heart rate during labor
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Analgesics
Drugs used to relieve pain
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Cesarean delivery
A surgical birth where the doctor makes an incision in the mother's abdomen and lifts the baby out of the uterus
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Preterm infants
Born several weeks or more before their due date
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Small-for-date infants
Below their expected weight considering length of the pregnancy
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Infant mortality
The number of deaths in the first year of life per 1,000 live births
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Neonatal mortality
The rate of death within the first month of life
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Reflex
An inborn, automatic response to a particular form of stimulation
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States of arousal
Degrees of sleep and wakefulness
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Rapid-eye-movement (REM) sleep
Irregular sleep where brain-wave activity is remarkably similar to that of the waking state. Heart rate, blood pressure, and breathing are uneven
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Non-rapid-eye movement (NREM) sleep
Regular sleep where the body is almost motionless, and brain-wave activity, heart rate, and breathing are slow and even
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Sudden infant death syndrome (SIDS)
The unexpected death, usually at night, of an infant under 1 year of age that remains unexplained after thorough investigation
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Colic
Persistent crying that is high-pitched and harsh sounding
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When are infants highly sensitive to pain?
At birth
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Endorphins
Painkilling chemicals in the brain
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What is the least developed sense at birth?
Vision
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Retina
Membrane lining the inside of the eye that captures light and transforms it into messages that are sent to the brain
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Lens
Permits us to adjust our visual focus to varying differences
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Visual acuity
Fineness of discrimination
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Neonatal Behavioral Assessment Scale (NBAS)
Evaluates the newborn's reflexes, muscle tone, state changes, responsiveness to physical and social stimuli, and other reactions
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Oxytocin
Mothers begin producing this hormone at the end of pregnancy which stimulates uterine contractions; causes the breasts to "let down" milk; induces a calm relax mood; and promotes responsiveness to the baby
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