PSY 3171 Lecture 2: Mood Disorders Part 2
8 Dec 2015
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Twin studies: mood disorders are related but are still distinct; Family history studies (twin studies, genetic markers, heritability) identical twins create higher risk with bp, and major depressive disorder. If one twin has mdd, the other twin has a 45% chance. Mdd is more likely if twin has mdd or bp. Of identical twins concordant for a mood disorder, 80% are concordant for polarity (80% share the same type of diagnosis) Genetics cause= 40% of mdd (less for men though) 60-80% of the cause is environmental factors. Negative affect: tendency to experience negative emotions more. Vulnerability to mood/anxiety disorders + critical upbringing = often depression. Vulnerability stress model: predisposition to disorder + stressful. Someone with depression cycles through normal mood and life event=disorder depressed mood exams, breakup, job loss) world, future) Stressful life events tends to predict depressive episodes (death, Becks"s cognitive triad for depression negative cognitions (self, The world is unfair and my future is hopeless.
