Human Development
Multidisciplinary: includes _____________________
The scientific study of age-related changes across physical, cognitive, social and behavioural domains
developmental psychology
Developmental Psychology:
Give an E.g.
The study of how behaviour and mental processes change over the lifespan
E.g., language and self-control development
Lifespan Perspective:
Human Development now includes the __________________
Early work focused on development up to _____________ (i.e., child development) Modern perspectives recognize _________ throughout adulthood
full human lifespan
adulthood
change
Lifespan perspective
Changes happen throughout the entire human lifespan and must be interpreted in light of the culture and context in which they occur; interdisciplinary research is critical to understanding human development (Boyd et al., 2021).
Post-hoc fallacy (Correlation does not equal causation!)
Give an E.g.
The false assumption that because one event occurred before another event, it must have caused that event.
E.g.; parent notices ADHD symptoms in child after several years playing video games
Bidirectional Influences
Give an E.g.
Many relationships are bidirectional throughout development
Parents influence children; but children also influence parents
E.g., Temperament & personality relationship with parenting style
The Influence of Early Experience - Early experience can be important
Critical Periods:
Sensitive Period:
specific periods in development when an organism is especially sensitive to the presence (or absence) of some particular kind of experience
a span of months or years during which a child may be particularly responsive to specific forms of experience or particularly influenced by their absence.
Infant Determinism: Myths about Early Experience
Infant Determinism:
Reality:
Childhood Fragility:
Reality:
Infant Determinism: extremely early experiences (especially the first 3 years) are almost always more influential than later experiences in shaping human development
Reality: experience depends on the domain; later childhood and adult experiences are important
Childhood Fragility: children can be easily damaged by experience
Reality: young children are very resilient
Clarifying the Nature-Nurture Debate
The relationship between genes and environment is _________
There are many different ________ and _______________ factors
These factors interact in nuanced ways
complex
genetic, environmental
Gene-Environment Interactions
Genetic susceptibilities interact with environmental experiences
Nature via Nurture
Biological dispositions can lead to the selection of particular environments - can lead to the assumption that the environment is responsible for the trait (when really genes are a major factor).
Gene Expression
Epigenome:
Environment influences gene expression: Genes can turn “on and off” based on environmental experiences
the sum total of inherited and acquired molecular modifications to the genome that leads to changes in gene regulation without changing the DNA sequence of the genome
Cohorts:
Groups of individuals who are born within a particular span of years and share the same historical experiences at the same point in their development
Cohort Effect:
Effect observed in a sample of participants that results from individuals in the sample growing up at the same time.
Can confound the ability to attribute differences to age
Research on age-related changes:
Cross-sectional research design: investigates people of different ages at a single point in time
Advantage:
Disadvantage:
investigates people of different ages at a single point in time
Advantage: convenient
Disadvantage: cannot disentangle cohort vs. aging effects
Longitudinal research design:
Advantage:
Disadvantages:
Investigates development in the same group of people on multiple occasions over time
Advantage: watch aging unfold;
Disadvantages: limited knowledge of other cohorts, time/resource intensive, and attrition
Cohort-Sequential Research Design:
several age cohorts are followed and tested longitudinally
Combines cross-sectional and longitudinal research
Conception
Ovum is fertilized by _____
Gametes contain 23 unpaired ________________ - combine at conception to form Zygote
__________ divides into more cells and moves towards uterus - ________ implants
sperm
chromosomes
Zygote
blastocyst
Three Stages of Prenatal Development
Germinal Stage:
Embryonic Stage:
Fetal Stage:
G: conception to implantation
Zygote rapidly divides - blastocyst
Implantation and placental development
E: implantation to end of week 8
Foundational structure building for all parts of the body; neural tube is formed
F: week 9 to birth
Increases in size
Refinement of organ systems: brain and lungs
Brain Development
Brain development begins in the _________ stage
Neural tube forms - becomes brain and spinal cord
Neuronal Proliferation:
Migration:
embryonic
neurons are generated
movement of brain cells to permanent location
Teratogens:
Give an E.g.,
Teratogens can have differing effects depending on the _________ of exposure; brain is particularly susceptible
environmental factors that can exert a negative impact on prenatal development
Viral infections, drugs, environmental chemicals, diet, age, chronic illness, mental health
E.g., Alcohol, FASD
timing
Genetic Disorders
Result from ____ mutations or wrong amount of _________ material
Autosomal or sex-linked (e.g., sickle-cell disease; Huntington’s disease)
Chromosomal errors (e.g., Trisomy-21)
DNA
genetic
Preterm Infants:
Viability point:
born live before 37 weeks
Babies born before 22 weeks rarely survive
23-25 weeks
Health Issues associated with preterm birth:
Before 32 weeks: may lack adaptive reflexes
Digestion issues; Thermoregulation issues
Lung/breathing, cardiovascular, and immune deficiencies
Neurological problems
Low-birth weight; higher overall mortality