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.

Breaking Bulimia

Breaking Bulimia

We have all been there: turning to the refrigerator if feeling lonely or bored or indulging in seconds or thirds if strained. But if you suffer from bulimia, the from time to time urge to overeat is more like an obsession.

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