Mood disorders represent a major health burden for society and impact individuals' ability to function socially and professionally. Recent research has challenged the Current DSM-IV-TR categorical diagnostic system for unipolar and bipolar mood disorders. This thesis reviews existing research in support of both categorical and dimensional models of mood disorder. A dimensional model appears to be supported based on current research. This thesis proposes a two-dimensional model of mood disorder and suggests directions for future research. It is anticipated that the. acceptance of a dimensional model of mood disorders might lead to changes in assessment, diagnosis; and treatment of mood disorders.
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