Developmental👶🏼 Flashcards
Theory of mind
And rock paper research
Ascribe mental states to self and others, understand they don’t always reflect reality
Challenging in new scenarios, interpretation can depend on background knowledge
-rock paper scissors winners stick with winning action
Mental states timeline
9 months look longer when adult reaches for a new toy (understand adult’s goal)
12 months shared mutual gaze, Protodeclarative pointing
18 months mental awareness: name object ‘modi’ and gave adult broccoli even though child prefers crackers
2yrs- contrast desires (I don’t like it but he does)
3yrs- “think” and “know”
Developing belief ability
4 yrs understand others beliefs
3-5yrs explicit mental state understanding
6yrs complex beliefs
When is insight apparent
Mental states differ from others’
Answer could have been based on self and happens to share common opinion
False belief tasks
Cannot substitute own beliefs for other character’s
Unexpected transfer tasks-asked character’s belief, object hidden without them knowing (5yr olds pass)
Unexpected content task- ask what you thought, another would think was in there (3yr can’t predict)
Second order theory of mind 6yrs
Research
Theory theory- Piagetian experiments
Update theory with evidence, understand false beliefs
False photograph test, move object from frame after (same as false belief without mental state component) ask where object was in room AND is in photo- 5yr pass both
Factors influencing theory of mind acquisition
Siblings- more likely pass false belief task age 3/4. Older siblings social interaction
Family- talks about mental state more success
Culture- same order: emotions, desires, beliefs
Executive function-those with better inhibitory control do better
Violation of expectancy task and inconsistencies in research
Look longer when adult reaches for object that has been swapped
Understands false beliefs BUT 3yr olds were seen to be poor at it previously : TWO SYSTEMS
Fast and simple- automatic and inaccurate
Slow and implicit- develops later around 4, acknowledge false beliefs
Symbols
Stands in for something (word, pic, gesture)
Think about objects without holding every aspect in the mind
Arbitrary- no resemblance to referent
Iconic-looks like referent
Symbols development timeline
And research
9 month- attempt to suck bottle photo (utilisation)
18month-understand symbols differ from referents
Select real whisk not photo it was paired with
Moving word task- 3yr say dog when word placed by dog but teddy when move dog teddy
Moving number task-understand numbers are fixed, answer correctly
Dual representation
And research
Regard entity in own right e.g. paper and as what it represents e.g. dog. Perform better if less salient
Scale model search task-model corresponds to room, hide object
3yr old can find object in real room
Strategic reasoning task-asked to give away small or big sweets. 3yrs struggle to focus away from reward. Better if symbolic
Neonate
Infant less than one month old
Ways to study child development through mother
Indirect: sounds on abdomen, mother report movement
Direct: ultrasound, fMRI
Prenatal periods
Germinal-8-10 days single cell zygote, morula to blastocyst. Attachment to uterine wall
Embryonic- up to 8th week primitive organs, sexual differentiation, respond to stimulation
Fetal period- 9th week until birth, early vertebrate,
Gastrulation 3 distinct germ layers
Germ layers
Ectoderm-brain, nervous system, skin. Neural plate, differentiates to forebrain, midbrain, hindbrain
Mesoderm- heart, sex organs, bones, muscles
Endoderm-inner lining of systems,organs
Formation of the brain (ectoderm)
3-4 weeks- neural groove to neural tube and brain and spinal cord
5-6 weeks- neural tube differentiates to forebrain, midbrain and hindbrain
7-14 weeks- clear division of hemispheres
6 month- nerve cell generation complete, cortex wrinkles, myelination
9 month- visually like adult brain
Phases of brain development: neural plate induction
Phase 1
Ectoderm induced by growth factors, neurons proliferate
Totipotent: zygote divides to produce all cells of body
Pluripotent: blastocyst, some are differentiating embryonic stem cells
Multipotent: neural tube develops, to any nervous system cell
Phases of brain development: neural proliferation
Phase 2
Generation of many cells
Anterior swelling becomes forebrain, midbrain and hindbrain
Phases of brain development: migration
Phase 3
Soma and immature axon, differentiates when migrates
Radial glial cells act as scaffolding for neurons to travel
Growth cones controlled by chemical attractants and repellants
Phases of brain development: axon growth and synapse formation
Phase 4
Synaptogenesis- chemical signal between pre and post synaptic neuron
Needs glial cells
Phases of brain development: cell death and rearrangement
Phase 5
40-70% die, can’t compete for neurotrophins for growth
Normal and necessary
Myelination- Motor myelinated before sensory. Begins in spinal cord, down craniogradual gradient to brain and cerebral cortex as mobility increases
Brain wiring- neurons and synapses connect, synaptic pruning
Fragile x syndrome
Defective gene suppresses pruning, neural noise
Causes MR and ADD
Cerebral cortex development
9 weeks- hemispheres
4 months- cells in cortex proliferate and migrate
6 months- cortex surface forms sucli and gyri, basic memory
External stimulation of neural networks
Touch
First to develop
Move towards facial touch in womb
Touch self, uterine wall, umbilical cord
Smell and taste
Smell followed by taste
Swallow and inhale amniotic fluid
Turn head to odourants in mother’s diet
Increased foetal swallowing to alcohol, later preference
Selectionary response to own amniotic fluid and mother’s colostrum and breast milk
Balance: vestibular system
Position relative to gravity
Sensed by three fluid filled canals in inner ear
Fluid moves to hairs in hairs for brain to process
Preterm babies rocked in incubator to stimulate
Sight
5 weeks- balloon structures, fold to two layer cup retina develops
2 months- lens develops, eye muscles
9 weeks-optic nerve cross over
5-7 month- REM, open eyes
30 weeks- can see patterns if born preterm
Hearing
6 weeks- auditory system
9 weeks- cochlea develops
14 weeks- vestibular system starts to work
25 weeks- detects vibrations of mother’s voice and heartbeat
Transnatal learning
Learning during prenatal period and remembered during postnatal period
35 weeks- learning/habituation
Learn sounds in utero, prefer mother’s voice and suck more to activate it (preterm babies do not show this)
4 days old- Discriminate language from foreign
Risks to foetal development
Chromosomal abnormalities increases with maternal age
Social function impairments increased with paternal age, could be from DNA myelination abnormalities in sperm
Inherited gene disorders
Maternal stress- premature birth but can be beneficial
Nutrition- low nutrition premature birth and low weight
Syphilis- liver damage, impaired eyesight and vision
Teratogens- environmental contaminants: drugs, alcohol, smoking
Teratogens
Smoking- increased spontaneous abortion, nicotine causes abnormal growth of placenta. Behavioural problems with attention
Alcohol- leading cause of mental retardation, fetal alcohol syndrome underdeveloped brain
Drugs- low birth weight, born addicted to heroin
Factors affecting teratogenic principles
Stage of development
Psychological state of mother
Teratogen concentration
Puberty
Vulnerable to risk behaviour with peers
Universal sequence, onset from 8-15 years
Stops at menopause for women, persists for men
Maturity based on limbic structures and hypothalamus
Adolescence
10-24
How is puberty triggered
Gonadotropin releasing hormone stimulates pituitary gland Releases leutenising hormone and follicle stimulating hormone.
Signal sex hormones to be released to sex organs
Sex hormones bind to ventral striatum, amygdala, cortex changing emotional response
Menarche and spermarche
Menarche: the term for a girl’s first period. It signals that ovulation has begun (although is often irregular for a few years)
Spermarche: the term for a boy’s first fejaculation, which signals sperm production has begun
Proof of puberty triggers
Immature gonads or pituitary gland transplanted to adult matures immediately, reproductive function
Altering hypothalamus/limbic system prevents prepubertal animal developing normal reproduction
Primary and secondary sex characteristics
Primary- directly involved in reproduction: testicles and ovaries
Secondary- not for reproduction: body hair
Factors affecting puberty onset
Girls ahead by months or years Genes and ethnicity effect Obesity quickens Stress quickens Malnutrition delays
Early maturing girls and boys
Girls- at risk of parental conflict, bullying, early sexual activity and substance use
Boys- more socially poised and respected but less empathy
Puberty changes in wellness and body rhythms
Lymphoid system (tonsils) decrease in size. Less susceptible to asthma and colds, oily skin
Body rhythms change, stay up and rise later
Puberty changes in the brain
Reduced grey matter in cortex myelination increases white matter
Visual and somatosensory mature first, higher order (frontal cortex) later, Subcortical regions mature before cortical
More sensitive to dopamine, oxytocin
Amygdala and hippocampus increase in size, basal ganglia decreases
Hall storm and stress
Adolescents heightened levels of emotion, uncontrollable turmoil
BUT not inevitable
Maturational imbalance model
Imbalance between hyper-activated early maturing limbic system with late developing prefrontal cortex control system (inhibits processes)
Causes specific behaviours e.g. risk taking
Adolescents responding to stimuli
Appetitive- sucrose water
Aversive- salt water
Hyper responsive compared to adults
Heightened attention to reward and threat (Activated ventral striatum)
Substance use disorders adolescents
Alcohol abuse 16-19
Cannabis 18-19
Cocaine 21-24
Psychotic disorders adolescents
Earlier male onset, smoking marijuana greater risk
Rats impaired synaptic plasticity and structural changes
Endocannabinoid system role in brain maturation, over activation (THC) causes long lasting changes
Nature and nurture substance abuse adolescents
Relevance of genetic factors on alcohol use increases with age, environmental factors decrease,
Extent to which genetics affect determined by environment, peer networks and community