Mood disorders are associated with increased size of:

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The amygdala has been consistently found to be enlarged in individuals with mood disorders, particularly depression and bipolar disorder. This is thought to contribute to increased emotional reactivity and sensitivity to negative stimuli. Enlargement of other brain regions such as the hippocampus and prefrontal areas has also been observed in some studies, but the evidence is less consistent.

Mood Disorders Are Associated with Increased Size Of