Brendgen et al. (2005) The Contemporary Study: Aggression In 6-Year-Old Twins

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Outline the aims of Brendgen's study
To examine differences in physical and social aggression in 6 year olds by surveying their classmates and teachers. To see if there are any links genetic or environmental to either types.
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What were her IVs?
Looking at aggression scores between DZ and MZ twins, looking at correlation between scores given by teachers and peer given scores, looking at differences between genders and types of twin in relation to the types of aggression
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What were her DVs?
Teacher ratings for both social and physical aggression were calculated out of 6, the peer ratings were gathered by getting them to talk about picture of their classmates.
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Describe her sample
She used 234 taken from a longitudinal study already being performed, she had 44 (MZ) male, 50 (MZ) female, 41 (DZ) males, 32 (DZ) females and 67 (DZ) mixed. This is a cluster sample
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How were the twins categorised?
Assigned to DZ or MZ by physical resemblance, except for 123 pairs who were assigned based on DNA tests
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What was the first thing she did in the procedure?
Get written consent from the parents
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Which organisation approved the research question and questionnaires
The Institutional Review Board
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What kind of data was collected to understand friendship patterns in the school?
Sociometric
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What where the teachers asked to do in the procedure?
The teachers were asked to complete a questionnaire that rated students on physical and social aggression using standardized scales
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What where the peers asked to do in the procedure?
They were presented pictures of their class mates and asked to circle the pictures that fitted the statement the most, from the data gathered they received a physical and social aggression score
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What was a strength of this way of collecting data?
The Inter-rater reliability was quite high making the data more reliable
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What was the issue with doing the study in Canada?
Because of the two languages spoken in Canada the interviews had to be done in French and English
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Card 2

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What were her IVs?

Back

Looking at aggression scores between DZ and MZ twins, looking at correlation between scores given by teachers and peer given scores, looking at differences between genders and types of twin in relation to the types of aggression

Card 3

Front

What were her DVs?

Back

Preview of the front of card 3

Card 4

Front

Describe her sample

Back

Preview of the front of card 4

Card 5

Front

How were the twins categorised?

Back

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