1 DEVELOPMENTAL PSYCHOLOGY - TEXTBOOK Flashcards
What is developmental psychology?
Study of continuity and change across the human life span
What is the nature vs nurture debate?
Naïve distinction about whether development is determined by genetics or environment
Why is the nature vs nurture debate naïve?
Genes that influence development also depend on the environment to determine how they are expressed
What is canalization?
The idea of development as constrained epigenesis
What is Waddington’s epigenetic landscape?
A metaphor for the concept of development as the interaction between genes and environment
What is the epigenetic landscape made up of?
Valleys and troughs at different depths
What happens as the ball rolls down the epigenetic landscape?
Some parts of its journey are well specifed/highly probable due to deep canalization and other paths are less predictable because path is less specified
What is infancy?
The period from birth up to second year of life
When is childhood?
Begins at around 18-24 months and continues until late adolescence
When is adolescence?
Begins with the onset of sexual maturity (around 11-14) and continues until the beginning of adulthood (18-21)
When is the prenatal stage?
Begins with conception, ends with birth
What is a zygote?
A single cell that contains chromosomes from both a sperm and an egg
How many chromosomes do sex cells contain?
23
When is the germinal stage?
Two week period that begins at conception
What happens during the germinal stage?
Zygote begins to divide, migrates down fallopian tube and implants itself in uterus wall
When is the embryonic stage?
Weeks 2-8
What is a blastocyst?
Cluster of embryonic cells
What is an embryonic disk?
Three-layered flattened structure that emerges from blastocyst
What are the three layers of the embryonic disk?
Endoderm, mesoderm and ectoderm
What is the endoderm?
Layer that goes on to form internal organs
What is mesoderm?
Layer that goes on to form skeletal muscles
What is the ectoderm?
Layer that goes on to form skin and nervous system
When is the fetal stage?
Week 9 until birth
When is the embryo known as a fetus?
During fetal stage
What is the neural tube?
The cylindrical structure of the embryonic nervous system
How is the neural tube formed?
A portion of the ectoderm folds over
What emerges from the neural tube?
Forebrain and midbrain at one end and spinal cord at the other
What happens to the neural tube around weeks 3-4?
Cells undergo neurogenesis
What is neurogenesis?
The formation of neural cells
What are teratogens?
Agents/toxins that affect fetal development
Name 4 examples of teratogens.
Lead in water, mercury in fish, tobacco, alcohol
What is fetal alcohol syndrome?
A developmental disorder that stems from heavy alcohol use during pregnancy
What are the possible effects of fetal alcohol syndrome?
Increased risk of birth defects (especially regarding shape/size of head and brain) and impaired cognitive development
What are the possible effects of tobacco use during pregnancy?
Perceptual and attentional problems and low birth weight
In which stage of pregnancy are teratogens the most dangerous?
During the embryonic stage
When does the human brain begin to function?
As it is being built
What can a fetus learn while in the womb?
Mother’s voice
What is prosody?
The rythym of speech
What is the usual gestation period of human babies?
40 weeks
What are generative processes?
Those that lead to the formation of new structures
What are three major generative processes?
Aborization, Synaptogenesis, Myelination
What is arborization?
Process where cell axon lengthens and grows increasing dendritic branches
What is synaptogenesis?
Increase in number of synaptic junctions
What are synaptic junctions?
Areas where cells communicate through activity of neurotransmitters
What is myelination?
Formation of fatty sheath around axons of a brain cell
What is the function of the myelin sheath?
To increase rate of signal transmission along axon
What is synaptic pruning?
Mechanism which eliminates synaptic connections
What is the function of synaptic pruning?
Discarding inactive connections increases efficiency
What is the phrase often attributed to synaptic pruning?
Use it or lose it!
What is plasticity?
The capacity of the brain to be moduled by experience
What are three reasons humans are born with underdeveloped brains?
Evolution of brain, adaptability to born environment, learning from others
What are the two types of plasticity?
Experience-expectant plasticity, experience-dependent plasticity
What is experience-expectant plasticity?
Pre-specified neural organisation that is waiting for input from environment
When does experience-expectant plasticity typically operate?
During sensitive periods of development
What are sensitive periods of development?
Relatively specific times when environmental input is expected
Give an example of experience-expectant plasticity?
Development of visual system during first 6 months of life
What is experience-dependent plasticity?
Non pre-specified neural organisation that depends on input from environment
How does timing of experience affect experience-dependent plasticity?
It doesn’t
What are the two types of developmental change?
Quantitative and qualitative change
What is quantitative change?
Amount or quantity of change
What is qualitative change?
Type or quality of change
Why is qualitative change significant?
Suggests significantly different mechanisms are operating
What is a milestone?
Important demarcating event on path of development
What does demarcate mean?
To define limits of, distinguish
What are stage theories?
Theories that advocate development as a fundamental reoraganisation of underlying mechanisms
What are the five primary developmental functions?
Continuous increasing ability, continuous decreasing ability, step or stage like, inverted u-shaped, upright u-shaped
How do you remember the five developmental functions?
Up, down, on the stairs, going in circles
What are the two typical research designs in developmental psychology?
Longitudinal, cross-sectional
What tool is employed in longitudinal studies?
Repeated measure
What are cross-sectional studies vulnerable to?
Cohort bias
What is cohort bias?
Anomalies predominant in one group that distort comparison between groups
Who is considered to be the father of developmental psychology?
Jean Piaget
What is Piaget’s clinical method of studying children?
Manipulating the situation to see how the child’s behaviour changes in a reliable manner
What did Robert Fantz (1961) establish?
Visual preference paradigm
What is the visual preference paradigm?
Technique that uses difference in duration of looking to infer pattern discrimination
What is the most common experimental method used with very young children?
Habituation
What is habituation?
Response to stimulation declines with repeated exposure
What is the preference for novelty paradigm?
Following habituation, organisms prefer to attend to novel stimulation
Why is the preference for novelty paradigm poweful?
Tests how well the infant differentiates aspects of the world
What is VOE?
Violation of expectancy paradigm
What is the violoation of expectancy paradigm?
Where the anticipated outcome is deliberately contravened
What does the VOE show?
Infant is not passive, they are trying to work out what should happen next
What is a geodesic sensor?
A network of sensitive electrodes that detects tiny changes in electrical voltage at the scalp surface
What is a structured interview?
A consistent set of questions about a topic under consideration
Can newborns see?
No, newborns are legally blind
What is acuity?
The level of finest visual detail that can be resolved
What is visual scanning?
The ability to selectively move one’s eyes around the environment
What is sticky fixation?
Where infants younger than two months appear to lock their gaze on highly visible objects from which they cannot easily disengage
What is visual contrast?
Areas of greatest brightness relative to darkness
At what age is an infant’s vision comparable to that of an adult?
6 months
At what age does hearing reach adult levels?
5 to 8 years
What, during pregnancy, may affect later food preference of infants?
Taste of amniotic fluid
What does touch stimulate in infants?
Release of hormones that regulate metabolism and growth
What are mental representations?
Patterns of neuronal activity that refer to aspects of the external world
What are the five levels of processing and representation in the brain?
Stimulus, sensory representation, perceptual process, perceptual representation, cognition
Do newborns represent perceptual constancies?
Yes
What are perceptual constancies?
Compensatory processes that adjust for percieved physical changes of size and shape that enable us to recognize that as an object moves, it remains the same object
What is crossmodal perception?
Capacity to detect correspondences of different features from different sensory modalities
What does crossmodal perception require?
Integration of information from visual and auditory processing regions of brain
What is the primary reason for developing a brain?
To move around at will and act on environment
What is motor development?
The emergence of the ability to execute physical actions such as reaching, grasping, crawling and walking
What are reflexes?
Specific patterns of motor response that are triggered by specific patterns of sensory stimulation
What is the ‘rooting’ reflex?
Tendency for newborns to move their mouths towards anything that touches their cheek
What are reflexes supported by?
Subcortical brain mechanisms
Describe the pattern of development of motor skills?
Ordered sequence but not a strict timetable
What is stereopsis?
Perception of depth by combining the images from each eye
Is stereopsis present in newborns?
No, relies on cortical mechanisms and emerges around 3 months
What is the visual cliff?
Platform with a shallow drop on one side and a steep cliff on the other
What does the visual cliff test?
Depth perception and fear responses to drops in height
Why may infants avoid crossing the deep side of the visual cliff?
They perceive affordances
What are affordances?
Potentials for possible actions by agents acting on the environment
Who is known to be the father of cognitive development studies?
Jean Piaget
How many stages are there in Piaget’s theory of cognitive development?
4
What are the four stages of Piaget’s theory of cognitive development?
Sensorimotor, preoperational, concrete operational, formal operational
What did Piaget believe about transition through the stages of development?
They are universal and invariant
In what way are Piaget’s stages universal?
Every child in every culture goes through the same stages
In what way are Piaget’s stages invariant?
Every child goes through the same sequence in the same order at roughly the same time
What produces cognitive development according to Piaget?
Maturation, experiences and activities