What was Rutter's procedure? What type of experiment was it? What were the 3 conditions? How was information about them gathered? What was their progress compared to?
A natural experiment - they followed a group of 165 Romanian orphans adopted in Britain to assess their physical, cognitive and emotional development at ages 4,6,11 and 15 years, making it a longitudinal study.
The IV was the age of adoption, with 3 groups identified.
Condition 1: children adopted before the age of 6 months.
Condition 2: children adopted between 6 months and 2 year.
Condition 3: children adopted after the age of 2 years.
Information gathered through interviews with parents and teachers.
A control group of 52 British children adopted in the UK before the age of 6 months.