The conceptualization of psychological abnormalities as diseases that, like biological diseases, have symptoms and causes and possible cures

A disorder characterized by chronic excessive worry accompanied by three or more of the following symptoms: restlessness, fatigue, concentration problems irritability, muscle tension, and sleep disturbances

A disorder characterized by a severely depressed mood that lasts 2 weeks or more and is accompanied by feelings of worthlessness and lack of pleasure, lethargy, and sleep and appetite disturbances

A patently false belief system, often bizarre and grandiose, that is maintained in spite of its irrationality

A classification system that describes the features used to diagnose each recognized mental disorder and indicates how the disorder can be distinguished from other, similar problems

Disorders characterized by marked, persistent, excessive fear and avoidance of specific objects and activities (specific or social)

A disorder that involves the same symptoms of depression only less severe, but the symptoms last longer, persisting for at least 2 years

A false perceptual experience that has a compelling sense of being real despite the absence of external stimulation

The co-occurence of two or more disorders in a single individual

The idea that people are instinctively predisposed toward certain fears

An unstable emotional condition characterized by cycles of abnormal, persistent high mood (mania) and low mood (depression)

A marked decrease in all movement or an increase in muscular rigidity and overactivity

A model suggesting that a person may be predisposed for a mental disorder that remains unexpressed until triggered by stress

A disorder characterized by the sudden occurrence of multiple psychological and physiological symptoms that contribute to a feeling of stark terror

The area of the brain that shows diminished activity in major depression

The neurotrasmitter that has been related to schizophrenia

The assumption that if a treatment is effective it must address the cause of the problem

An extreme fear of venturing into public places

The types of neurotrasmitters that drugs can increase levels of in order to reduce depression

The type of schizophrenia that includes absurd, illogical, and changeable delusions; vivid hallucinations; impairment of judgment; dangerous behaviors