anhedonia One of the core symptoms of depression; defined as the loss of interest in, and inability to derive pleasure from, activities that were previously considered interesting and pleasurable.

catecholamine A group of neurotransmitters that includes nor-epinephrine, epinephrine, and dopamine.

concordance rates The proportion of twins in a sample that both possess the disorder of interest.

heritability The proportion of the variance of a disorder in the population that is due to genetic factors.

indoleamines A group of neurotransmitters that includes serotonin and histamine.

lifetime prevalence The proportion of individuals in an epidemiological sample that have ever experienced a disorder at some point in their lives.

Depression is a psychiatric disorder with emotional, cognitive, physiological, and behavioral symptoms. This article presents both biological and psychological theories and treatments of depression.

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