Chapter 4 - Development Over the Lifespan Flashcards
Developmental Psychology
Changes in biological, physical,
psychological, & behavioural processes across the lifespan
Nature and Nurture
Environment or heredity?
- how much genetics and environment are influential on human development
- how much does each one influence
Critical Period
Age where experiences MUST
occur
- brain must have certain environmental stimuli to develop properly, like with light
Sensitive Periods
Optimal age range
- learning a second language before age 12 as if it were a first
Cross Sectional Research Design
Compare DIFFERENT AGES at SAME TIME
– Different cohorts grew up in different time periods
– Different experiences, cultural changes, environmental changes
– Technology; growing up in depression; access to higher education etc.
Longitudinal Research Design
Test SAME cohort (same group of people) at different times
– Expensive and time consuming
– People drop out
– Are results generalizable to all people, just this group?
Sequential Research Design
COMBINATION of cross-sectional and
longitudinal design
– Test several cohorts as they age
- Very time consuming and expensive
Prenatal Development
- Germinal
- Embryonic
- Fetal
Gary Eats Figs
Germinal stage
– First 2 weeks
– Zygote attaches to uterine wall
- 1 sperm fertilizes an ovary
Embryonic Stage
– 2nd - 8th week
– Placenta & umbilical cord develop
What Function does the Placenta and Umbilical Cord have in prenatal development?
Enables nutrients and oxygen to pass from the mother’s blood to the embryo, and in
turn carry waste products back from the mother to the embryo
- this process speeds up prenatal development, and embryonic cells divide rapidly and become specialized
- bodily organs and systems begin to form,
and by week 8, the heart of the 2cm embryo is beating and the brain is forming
Fetal Stage
– Begins at 9th week
– 28 weeks = age of viability (fetus is likely to survive outside the womb in case of premature birth)
How many pairs of chromosomes do most human cells have?
23 pairs
What does each pair of chromosomes contain?
One chromosome from each parent (23 from mother, 23 from the father)
23rd chromosome for Females and Males
Females: XX Males: XY
What does the Y chromosome contain?
TDF (testis determining factor)
TDF (testis determining factor)
Initiates development of testes
– Testes secrete androgens (sex hormones that direct male pattern of organ development)
What is the Critical Period for TDF?
6-8 weeks
– Insufficient androgen activity = female
Teratogens
Environmental agents that may cause
abnormal fetal development
– Mercury, lead, radiation, nicotine, stress, alcohol
Maternal Malnutrition
Miscarriage, premature birth, stillbirth,
impaired brain development
Maternal Stress (stress hormones)
Premature birth, infant irritability, attentional
deficits
Sexually Transmitted Diseases
Can pass from mother to fetus and produce brain damage, blindness, and deafness, depending on the disease
Nicotine
Increase the risk of miscarriage,
premature birth, and low birth weight
– Second-hand smoke through fathers or the environment
Effect of Drug use
Babies of pregnant mothers who use heroin or cocaine are often BORN ADDICTED and experience withdrawal symptoms after birth
Fetal Alcohol Spectrum Disorders
Cognitive, behavioural, and
physical deficits caused by
prenatal exposure to alcohol
Fetal Alcohol Syndrome (FAS)
Disorder within the spectrum
involving a cluster of SEVERE DEVELOPMENTAL ABNORMALITIES
- Abnormal facial features, underdeveloped brains
- intellectual disability, attentional and perceptual deficits, impulsivity, and poor social skills
What did William James suggest about newborn children?
That the newborn’s world is a “buzzing, blooming confusion”
– They are passive, disorganized,
and have an empty mind.
- This view is NO LONGER VALID, given our knowledge of prenatal sensory-motor development; the tactile, auditory, and chemical perceptual systems have been stimulated and are operating at birth.
Newborn Sensation and Perception of Vision
Visual system is POORLY DEVELOPED at birth.
● VERY NEARSIGHTED: 20/800 at birth (40 times worse than normal adult acuity of 20/20)
● Gets BETTER PROGRESSIVELY (20/100 by 6 months)
● Can focus on an object 20-40 cm away
Preferential Looking Procedure
Measures how long infant looks at a stimulus
* Newborns look longer at stimuli THEY FIND INTERESTING
– Determine when ‘detail’ becomes interesting
Colour vision in infants and children
Can see few colours as newborns, perceive full range of colours by 3 MONTHS
– Prefer patterned stimuli
– Prefer mother’s face
Newborn sensation and perception of Other Senses
Tactile, auditory, & olfactory senses operating at birth
* Orient to significant stimuli
- Will orient towards source of sounds, tactile stimuli, odours
- Most importantly, towards their MOTHER’S FACE, voice, and smell, optimizing their access to food, warmth, and social stimulation
Sound Localization
Ability to localize sounds
- U-shaped function, disappears at 4 months, reappears at 6 months
Phoneme Discrimination
Ability to detect changes in speech sounds (by 2 months age)
- Exceeds that of an adult, disappears by 1 year of age (as they become native speakers of their own language)
Music Perception
Shows similar responses to consonant & dissonant patterns as adults
- Can remember short melodies
Habituation Procedure
New stimulus presented (over and over again until the infant is habituated to it)
– Looking time declines 50%
* Recognize familiar faces
* Discriminate different speech sounds (orient toward the stimulus longer)
Classical and Operant Conditioning
Acquire classically conditioned responses
* Learn that they can “make things happen”
Imitation
Imitate adult facial expressions
- helps infants recognize people and engage with them
- 1 day old
Maturation
Genetically programmed biological process that governs our growth
- our bodies, brain and motor skills develop
Cephalocaudal Principle
Development is from head to foot
- head develops before the torso, torso develops before legs, so on
Proximodistal Principle
Development is from innermost to outer
- shoulder before arms, arms develop before hands and fingers
How much does the human brain weigh at birth?
Weighs 25% of adult brain
* 50% by 6 months
* Cells become larger and neural networks form
Stages of Brain Development
- First → brainstem (basic survival
functions) - Last → associative areas of cortex (decision making, reasoning)
Growth rate of the brain in Infants
- 5 years = 90% of adult size
- New synapses form, unnecessary
synapses are pruned back
Stage-like Development (motor development)
Age of acquiring skill differs, but the sequence is the same
- Some have U-shaped function → stepping reflex (involuntary stepping movement when placing their feet on a surface)
Environmental and Cultural
Influences on Physical Development
- Diet (consistent breast feeding - cognitive development)
- Enriched environments: interaction with people, access to toys… (helps them to thrive)
- Physical touch (develop physically and neurologically)
Environmental and Cultural
Influences on Sensory Development
Visual deprivation can permanently damage
visual abilities
General Principles of environmental and cultural influences
- Biology sets LIMITS on environmental influences
- Environmental influences can be POWERFUL (nurturing environments should not be underestimated)
- Biological & environmental factors INTERACT with each other