Susan Kay Nolen-Hoeksema (May 22, 1959 – January 2, 2013) was an American professor of psychology at Yale University. Her research explored how mood regulation strategies could correlate to a person's vulnerability to depression, with special focus on a depression-related construct she called rumination as well as gender differences. She is credited with bringing rumination to the attention of clinical psychology, and since the time of her early writings, rumination has emerged as one of the most powerful cognitive risk factors for depression.
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