Developmental psychology
The study of physical, cognitive, social, emotional and behavioural changes throughout life span
Aims of developmental psychology
Describe human development
Explain human development
Optimise human development
Baltes’ Model of Development
3 types of influence on development
- normative age-graded influences -> e.g. puberty, starting school
- normative history-graded influences -> e.g. WW2, natural disasters
- non-normative life events -> e.g. death of parents, serious Injury
How do we test for these influences?
Age
Cohort
Time of testing
Research designs
Cross-sectional studies
Longitudinal studies
Cohort studies
Cohort-sequential studies
Cross-sectionla studies
Different ppts, different ages, same time
Cost effective
Quick
Confounds
- individual differences
- cohort effects
Longitudinal designs
Same ppts, different ages, different times
High attrition rate
Time-consuming
Original research question still viable at study completion
Confounds
- biased samples
Cohort studies
Different ppts, same ages, different historical time
- e.g. the effect of the invention of tv in 8 year olds born in 1949, 1970 and 2000
Time consuming
Danger of research question becoming obsolete
Confounds
- age of child
Cohort sequential design
Different same same ppts, different and same ages, different and same historical time
- e.g. effect of preschool programmes on children born in 1990, 2000 and 2010, follow them from 3-12 years of age
High attrition rate
Time consuming
Question may become obsolete
What influences development
Many things such as
- siblings
- friends
- genes
- parents
- culture
- individual learning
- evolution
- social learning
- biology
- environment
Major development “themes”
Continuity/discontinuity
Stability/change
Nature/nurture
Twin studies
Monozygotic twins (~100% identical)
Dizygotic or fraternal twins (50% identical)
Confounding effect of environmental
- identical twin reared apart?
Adoption studies
Rearing environment from adaptive parents
Genetic inheritance from biological parents
Whom do they resemble most?
Draw backs
- cross-fostering experiments
- e.g. Kikusui et al (2011)
Nature and nurture
Genotype-environment interaction
- e.g. child’s temperament affect interaction with parents
Evolution and development
Evolutionary psychology
- does human ancestry tell us about ourselves now?
- e.g. nomadic hunter-gatherer environment
- spatial mapping -> hunting and tracking animals
- remembering locations -> finding and gathering
Evolutionary development psychology
- e.g. play differences in girls and boys
Example
- young chimpanzee females more likely to carry stick of rock ‘dolls’ than males
- does this mean the behaviour is innate in humans?
- is this evidence to support an evolutionary explanation for sex differences
Other explanation?
- copying behaviour of older individuals
- females use tools more often
Criticisms
- learning/experience and culture
- e.g. Karbi and Lhasa tribes (Hoffman et al, 2011)
- neurosexism and binary view
Cross-cultural differences
Motor milestones
- WHO guidelines for windows of achievement for: string without support, standing with assistance, hangs and knees crawling, walking with assistance, standing alone, walking alone
Problems
- are they universal or cultural conventions
- cultural practises impact upon development (e.g. encourages to sit earlier/massages vs restrained for long periods of time)
- Karasik and Robinson (2022)
How does culture affect development views?
- e.g. tests designed by one culture to test intelligence in another?
- over emphasis on particular culture to describe “universal” human development? (W.E.I.R.D science)
- scientists are products of their culture