BIOLOGICAL Brendgen Et Al Flashcards
1
Q
when did the study take place
A
2005
2
Q
why are twin studies used
A
establish the extent to which behaviours are the result of nature and nurture
3
Q
what is the aim of the study
A
to study the contribution of genes and environment to social and physical aggression
4
Q
what is the definition of social aggression
A
damaging someone’s relationships or social status
5
Q
what was the sample used
A
- secondary data from the longitudinal twin study from Canada
- 234 pairs of 6 year old twins
- 175 pairs from different classes
- mixture of MZ and DZ
6
Q
how was data collected
A
- peer ratings from sociometric data for levels of aggression
- photos and behavioural descriptors used
- responses were given on a 3-point scale
- all responses added to get a total social and physical aggression score
7
Q
who approved the research questions
A
institutional review board
8
Q
how was the data analysed
A
MZ ratings were compared with the same sex DZ ratings (a control)
9
Q
what were the results
A
- MZ correlations twice as high as DZ for physical aggression - genetics
- MZ and DZ correlations for social aggression were similar - environmental
10
Q
what was the conclusion
A
- social aggression due to environmental factors
- physical aggression due to genetic factors
- child who shows physical aggression when young = more likely to show social aggression as they mature
11
Q
positives of Brendgen
A
- ethical - did not directly manipulate the children (secondary data) - principle of responsibility
- inter-rater reliability - both teachers and peers had high level of agreement - consistency
- same sex DZ twins macthed with MZ twins - similar as possible - internal validity
12
Q
negatives of Brendgen
A
- secondary data - lowers validity - no way of checking data - own research may be flawed
- ratings of aggression based on memory recalls - may not match reality - not a valid way of measuring
- only data from 6 year old twins from Canada - cannot generalise - aggression influenced by cultural norms
