Gottesman (1991) - twin studies

Question 1

what is the method of twin studies?

Answer 1

Gottesman carried out a meta-analysis of approximately 40 twin studies

Question 2

what were the results of the study?

Answer 2

it was found that having an identical twin with schizophrenia gave you a 48% chance of developing the condition
17% in non-identical twins

Question 3

what is the conclusion of thew study?

Answer 3

schizophrenia has a strong genetic basis

Question 4

what is the evaluation of the study?

Answer 4

• The meta-analysis was carried out on field studies giving it high ecological validity
• identical twins tend to be treated more similarly than non-identical twins which means that non-identical twins and so family environment may play a large role `