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Looking at explanations for depression both biological and psychological gives strong evidence that depression is due to either one of the factors or in many places a little of each.
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DEPRESSION Looking at explanations for depression both biological and psychological gives strong evidence that depression is due to either one of the factors or in many places a little of each. Looking closer at biological depression the main explanation is the genetic factor. First degree relatives who have mood disorders are more likely to develop one than with people who have relatives without this disorder. Allen (1976) showed a higher average concordance rate for bipolar disorder in MZs (72%) than DZs (14%). For major depression concordance rates are different suggesting that if genetic factors are involved they are different for the two disorders. Data is, however, limited as families and twins share the same environment. But this factor has been overuled by the adoption studies. Adopted children who later develop a mood disorder appear to be more likely to have a biological parent with a mood disorder, who becomes an alcoholic or...
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