Lecture 3 - intelligence Flashcards
What did Galton study?
- studied twins, and how similar they were, especially in intellect
- Looked at their behavioural similarities/ differences
- found the closer the relative, the more similar you are
- therfore, he argued you can promote intelligence through selective breeding
What are the 3 types of studies into the heritability of intelligence?
- Family studies - similarity of intelligence compared to degree of relative, X - share environment so hard to distinguish
- Twin studies
- Adoption studies - compare similarities between a persons adopted family and their biological family - see which one they are more like
Outline Phomin et al (2004) methods
Compared the % similarities between: • same person tested twice • MZ twins raised together • MZ twins raised apart • DZ twins raised together • siblings raised together • siblings raised apart
Outline key findings of Phomin et al (2004)
- if it was down to genetics, MZ twins should be 100% similar
• MZ together was 86%
• MZ apart was 72% - clearly environment has some influence on intelligence
- DZ twins togther was 60%
- normal siblings raised together was 47%
- so this is also evidence to support genetics!
What do estimates in the literature estimate the % of characteristics caused by genetics are?
On average, it ranges from 50-80%
How can age of sample explain the variation?
- IQ changes over age
- and heritability of IQ changes with age
- least variation in early childhood as there is little variation in environment, everyone goes to school, gets taught the same stuff etc
What are the limitations of studies looking at heritability of intelligence?
- representativeness of studies
- tends to be people from high socio-economic status
- types of families are more likely to sign up than others - Understanding genetic influence
- havent pin pointed a specific intelligence gene yet, doubt they ever will - Impact and assortative mating
- need to be careful
Define assortative mating
- Tendency to mate with those who are similar to ourselves
- match on height, weight, age, SE status, education, ethnicity, geography
- mating on intellect stretches bell curve - increasing genetic variance within a population
- positive assortative mating = mating with people similar to the self
Outline the findings of Watson et al (2004) for assortative mating
- Looked at newlyweds
- intellect had a correlation of .4
- verbal intelligence was most similar intellect attribute
- personality = .2
- but is it similarities or just convergence over time?
What were Neisser et al (1996)’s 4 environmental factors that could influence intelligence?
- Biological environment
- nutrition
- pre/ peri-natal
- maternal factors - Family
- school/ education
- Culture
Outline Oddy et al (2004) - breast feeding
Perinatal nutrition
- compared those who breast fed for longer than 6 months to those shorter than 6 months
- Those who had breast fed longer developed higher IQ’s
Outline fetal alcohol syndrome
- exposure to alcohol/ substances/ nicotine whilst in womb can have damaging effects when you grow up
- child is born addicted to alcohol and cant function without it - e.g. has poor cognitive functions
Outline Mortensen et al (2005) - maternal smoking
Links between maternal smoking and IQ scores in 18 YEAR OLD MALES
What effects can prematurity and birthweight have?
- more premature and smaller weight can lead to risks about IQ
What did Mayer & Salovey (1990) define as emotional intelligence?
- 4 things
- understand own emotions and those of people around you
- distinguish different emotions
- use that info to guide thinking/ actions
- high IQ doesnt mean high emotional intelligence - some are better at processing information better than others
Define Alexithymia
Inability to label/ describe emotions - people who struggle with mental health may struggle in this
- cant describe how i feel!
Outline Mayer & Salovey’s theory of EI
- They argued that being able to identify, understand, label emotions are abilities
- it is advantageous for survival
- highest is most sophsticated, reducing downward
Strategic 2:
•Managing branch - regulate emotions and use them in constructive ways
• Understanding branch - observe relationship between event and likely emotional response
Experiential 2:
• Facilitating branch - problem solving, taking emotions into account during decision making
• Perceiving branch - recognising/ understanding