Developmental Psychology Flashcards
What is developmental psychology?
Developmental psychology is the scientific study of growth, change, and consistency through the lifespan.
What is human development?
In the context of life, human development is the scientific study of the changes that occur in people as they age, from conception until death.
What factors are taken into consideration in human development?
It can cover numerous different topics such as personality, cognition, biological processes, and social interactions.
What is longitudinal design study?
Most research in age-related changes are in a longitudinal design, in which a group of participants are studied over a long period of time.
What is a cross-sectional design study?
Several different age groups are studied at one time.
What is a cross-sequential design study?
Participants are first studied by means of a cross-sectional design but are then followed and assessed longitudinally.
What changes do longitudinal designs typically study?
Mainly examines age-related changes.
What changes do cross-sectional designs typically study?
Mainly examines age-related differences.
What is a cohort effect?
Cohort effect is where there is an impact on development occurring when a group of people share a common time period or common life experience.
In which design is cohort effect likely to occur?
Cross-Sectional Design & Cross-Sequential Design
What changes do cross-sequential designs typically study?
Examines both age-related differences & age-related changes.
What is ‘nature’ in terms of development?
Nature refers to heredity, the influence of inherited characteristics on personality, physical growth, intellectual growth, and social interactions.
What is ‘nurture’ in terms of development?
Nurture refers to the influence of the environment on the same things and includes parenting styles, physical surroundings, economic factors and other possible external factors.
According to scientific research, which affects human development more? ‘Nature’ or ‘nurture’?
After numerous years of scientific research, most developmental psychologists agree that all that people are and all people become is the product of an interaction between nature and nurture.
What is behavioural genetics?
Behavioural genetics is a field of study in which researchers try to determine how much of behaviour is a result of genetic inheritance and how much is due to a person’s experiences.
What are family studies?
Family studies typically measure many individuals from a large number of families on a particular behavioural trait of interest.
Researchers would then correlate the scores on the trait between family members (i.e. parents, siblings, grandparents, aunts/uncles, cousins).
What are adoption studies?
Tracks the presence or absence of traits in adopted children, among adoptive parents and biological parents.
What can be the conclusion if an adopted child shares a more similar trait or if there is a higher correlation between themselves and their adoptive parents?
It shows that environmental factors plays a greater contribution in that trait rather than genetic factors.
What can be concluded if the adopted child shares a more similar trait or there is a higher correlation between themselves and their biological parents?
It shows that genetic factors plays a greater contribution in that trait rather than environmental factors.
What are twin studies?
Compares the frequency of traits in identical twins (or monozygotic twins) who share 100% of genes and frequency of traits in fraternal twins (or dizygotic twins) who share approximately 50% of genes.
In twin studies for developmental psychology, their traits are being measured, but in what form?
They are being measured by the concordance rate, which is the percentage of twins in the study that share a particular trait.
In twin studies for developmental psychology, if there is a higher concordance rate in traits between the twins. Can it be concluded that the trait is definitively influenced by genetic factors?
Having a higher concordance rate does not equal to more evidence that the trait is more influenced by genetic factors, as external factors such as living environment also play a part.
What is genetics?
Genetics is the science of heredity or the science of inherited traits.
What is DNA?
DNA (Deoxyribonucleic acid) is a special molecule that contains the genetic material of the organism.
What is DNA comprised of?
Comprised of two sugar-phosphate strands, linked by amines or bases arranged in a particular pattern.
What are amines in DNA?
Amines are organic structures containing genetic codes for building proteins that make up organic life (i.e. hair colouring, muscle, skin).
What does each section of DNA contain?
An ordering of amines, called a gene.
What are chromosomes?
Tightly wound strand of genetic material or DNA.
Where are chromosomes located?
Found in the nucleus of a cell.
How many pairs of chromosomes do humans have typically?
23 pairs, for a total of 46 chromosomes.
What determines the sex of a person?
The last 23rd pair of chromosomes, also known as the sex chromosomes.
2 X-shaped chromosomes indicate a female
1 X-shaped & 1 Y-shaped chromosome indicate a male.
What are dominant genes?
Genes that are more active in influencing a trait are called dominant.
What are recessive genes?
Genes that only influence a trait when paired with an identical gene are called recessive.
What is fertilisation?
When an egg (or ovum) and a sperm unite, resulting single in a cell that will have a total of 46 chromosomes called a zygote.
How does the single cell of the zygote eventually become a baby?
The zygote would start to divide into multiple cells, each new cell also containing these 46 chromosomes, as the DNA molecules produce duplicates of themselves before each division (this process is called mitosis). The zygote eventually becomes a mass of cells, becoming a foetus/baby.
What happens when the zygote splits completely?
It will result in two foetuses being formed; these two foetuses are referred to as monozygotic twins, where they possess the exact same set of 46 chromosomes.
What occurs when two different eggs are fertilised by two different sperm?
Two separate foetuses form, however, they only share about 50% of the chromosomes.
What are the three stages of prenatal development?
The germinal period, embryonic period, and foetal period.
What occurs in the germinal period of prenatal development?
During the 2 weeks, the zygote begins dividing and moving down to the uterus, eventually attaching to the wall of the uterus.
Cells begin to differentiate or develop into specialised cells, in preparation for becoming various kinds of cells of the human body (i.e. skin cells, organs).
What occurs in the embryonic period of prenatal development?
Cells continue to specialise and become various organs and structures.
The mass of cells, now called the embryo, also begins to receive nourishment from the mother through the placenta.
What are critical periods in prenatal development?
A critical period is where environmental influences can have an impact on the development of the infant.
Teratogens may cause severe harm towards the infant.
What are teratogens?
Teratogens are any substances such as a drug, chemical, virus or other factor that can cause a birth defect.
A common teratogen is alcohol, which when consumed during a critical period, can lead to foetal alcohol spectrum disorders.
What occurs in the foetal period of prenatal development?
The foetus size increases by about 20 times. Organs continue to develop and eventually become functional.
At 38 weeks, the foetus is considered full term, most babies are born between 38 and 40 weeks.
When does the germinal period occur in prenatal development and how long does it last?
From conception until about 2 weeks after birth.
When does the embryonic period occur in prenatal development and how long does it last?
From 2 weeks after conception to about 8 weeks after conception.
What are teratogens more likely to affect during the foetal period of prenatal development?
The physiology or physical functioning of the organs, rather than their structure.
What are the two common methods of studying infants?
Preferential looking and habituation.
What is preferential looking and how is it used in studying infants?
It assumes that the longer an infant looks at the stimulus, the more the infant prefers that stimulus over others.
What is habituation and how is it used in studying infants?
Habituation is the tendency for infants to stop paying attention to an unchanging stimulus.
Habituation is commonly used as a tool to demonstrate the cognitive abilities such as categorization, object representation and memory, in infants.
What are infancy reflexes?
Infants have a set of innate (existing from birth), involuntary behaviour patterns called reflexes.
Paediatricians use these innate reflexes to determine whether a newborn’s nervous system is working properly.
What are the 6 common infancy reflexes?
Sucking, rooting, grasping, stepping, moro (startle), babinski.
What are some motor milestones in infancy motor development?
(1) Raising head and chest—2 to 4 months
(2) Rolling over—2 to 5 months
(3) Sitting up with support—4 to 6 months
(4) Sitting up without support—6 to 7 months
(5) Crawling—7 to 8 months
(6) Walking—8 to 18 months.
How does an infant’s brain develop?
The growth of new dendrites, axon terminals, and increasing numbers of synaptic connections.