Biological Contemporary Study

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Who conducted the contemporary study?
Brendgen (2005)
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Aim
1) If social aggression was caused by environment or genes, 2) If social aggression had the same cause as physical, 3) To see if one type of aggression leads to another type
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Procedure
Longitudinal study of 234 twin pairs of mixed MZ and DZ and gender, observed at the first few months up to 60 months, then at the age of 6, info from teachers and classmates of the twins were gathered
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How were the twins assessed for aggression with their teachers?
Selected questions from the Preschool Social Behaviour Scale (likert scale)
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How were they assessed with their classmates?
They got a booklet of children in their class and had to circle certain ones who matched the description
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Results
With their results they grouped together the children into social and physical aggression, they found that physical aggression was genetic 60% of the time but social was only genetic 20% of the time, showing environment is more of a factor in social
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Conclusion
Social aggression is largely dependent on environment
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Generalisability
Sample was too small, only looked at 6 year olds, representative of age group but not the population
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Reliability
Used questionnaires, making it easily replicable, 2 researchers visited classrooms giving it inter-rater reliability, with the strong correlation between teacher and peer ratings, made it reliable
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Applicability
Seen as we know social aggression is environmental, we can use this study to reduce it, e.g. workshops in school and educating parents
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Validity
Twin studies are a valid way of measuring nature vs nurture, however correlations don't imply causation, making it maybe not measuring why it intended to measure
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Ethics
Presumtive consent was given by twins parents and teachers, rating and telling on peers could hurt and upset each other
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Card 2

Front

Aim

Back

1) If social aggression was caused by environment or genes, 2) If social aggression had the same cause as physical, 3) To see if one type of aggression leads to another type

Card 3

Front

Procedure

Back

Preview of the front of card 3

Card 4

Front

How were the twins assessed for aggression with their teachers?

Back

Preview of the front of card 4

Card 5

Front

How were they assessed with their classmates?

Back

Preview of the front of card 5
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