Brendgen et al (2005)

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Examining Genetic and Environmental Effects on Social Aggression:  a Study of 6-Year-Old Twins

KEY -Evaluative Points

AIMS

> To investigate whether social aggression is caused by either genetics or the environment.

> To investigate whether social aggression has the same cause as physica aggression.

> To inestigate whether one type of aggression leads to another.

PROCEDURE

> Recruited from the Quebec Newborn Twin Study > all twins were born between November 1995 and July 1998.

> 234 pairs of twins > 44 MZ males

                             > 50 MZ females

                             > 41 DZ males       (ALL PAIRS)

                             > 32 DZ females

                             > 67 mixed pairs

> Longitudinal study > 5,18,30,48 and 60 months > again at 6 years.

> Data gathered contained 2 ratings of each twin's behaviour > by teachers and by peer pupils.

> Ratings were gathered within the spring term which ensured that all twins were well known.

Teacher ratings > based…

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