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Tienari. By Selina and Rob. Aim . To test the hypothesis that genetic factors lessen the susceptibility to environmentally intervening factors associated with rearing family functioning. Procedure. Finnish adoption study.

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Tienari

Tienari

By Selina and Rob


Aim

To test the hypothesis that genetic factors lessen the susceptibility to environmentally intervening factors associated with rearing family functioning.


Procedure
Procedure

Finnish adoption study.

Identified adopted-away offspring of biological mothers who had been diagnosed with schizophrenia and a matched control group of 135 adopted- away offspring of mothers who had not be diagnosed with any mental disorders.


Findings
Findings

Adopted group 1: Biological mothers had schizophrenia.

Adopted group 2: No family history of schizophrenia.

  • 7% of group 1 developed schizophrenia by adulthood.

  • 1.5% of group 2 developed schizophrenia by adulthood.


Conclusion
Conclusion

Children born to schizophrenic mothers and later adopted were more likely to develop schizophrenia.


Evaluation
Evaluation

  • This provides good evidence for the diathesis-stress model. The individual may have a genetic predisposition to schizophrenia which is triggered by the environment (the adoptive family).

  • If it is solely down to the genetic basis, we would expect over 7% of children whose biological mothers had schizophrenia to develop schizophrenia.


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