Behaviors or characteristics that are limited or absent; examples are social withdrawal, diminished speech, limited or no emotions, and loss of energy and follow-up.

Behaviors or actions that run counter to what is in one’s own best interest.

Perceptual-like experiences that an individual believes are real, but that are not evident to others.

A thought, an urge, or an image that happens repeatedly, is intrusive and unwelcome, and often causes anxiety and distress.

Sudden, extreme fear or discomfort that escalates quickly, often with no obvious trigger, and includes symptoms such as increased heart rate, sweating, shortness of breath, chest pain, nausea, lightheadedness, and fear of dying.

A set of behavioral, emotional, and/or cognitive symptoms that are significantly distressing or disabling in terms of social functioning, work endeavors, and other aspects of life.

Excesses or distortions of normal behavior; examples are delusions, hallucinations, and disorganized speech.

A tendency for people to believe they have no control over the consequences of their behaviors, resulting in passive behavior.

A psychological disorder distinguished by an incomplete sense of self, extreme self-criticism, unstable emotions, and feelings of emptiness.

A legal determination of the degree to which a person is responsible for criminal behaviors.

A group of psychological disorders associated with extreme anxiety and/or debilitating, irrational fears.

A psychological disorder that includes recurrent, unexpected panic attacks and fear that can cause significant changes in behavior.

Psychological disorders distinguished by disturbances in normal psychological functioning; may include problems with memory, identity, consciousness, perception, and motor control.

A behavior or “mental act” that a person repeats over and over in an effort to reduce anxiety.

A psychological disorder that includes at least one major depressive episode, with symptoms such as depressed mood, problems with sleep, and loss of energy.

Extreme fear of situations involving public transportation, open spaces, or other public settings.

A psychological disorder distinguished by unethical behavior, deceitfulness, impulsivity, irritability, aggressiveness, disregard for others, and lack of remorse.

A theory suggesting that the synthesis, release, and concentrations of the neurotransmitter dopamine play a role in schizophrenia.

A psychological disorder characterized by obsessions and/or compulsions that are time-consuming and cause a great deal of distress.

Strange or false beliefs that a person firmly maintains even when presented with evidence to the contrary.

Loss of contact with reality that is severe and chronic.

The occurrence of two or more disorders at the same time.

A condition in which a person with dissociative amnesia wanders about in a confused and unexpected manner.

A disabling psychological disorder that can include delusions, hallucinations, disorganized speech, and abnormal psychomotor behavior.

A disturbance in the normally integrated experience of psychological functions involved in memory, consciousness, perception, or identity.

States of continuous elation that is out of proportion to the setting, and can include irritability, very high and sustained levels of energy, and an “expansive” mood.

A negative attitude or opinion about a group of people based on certain traits or characteristics.

A psychological disorder that includes a distinct fear or anxiety in relation to an object or situation.

A psychological disorder that involves the occurrence of two or more distinct personalities within an individual.

A psychological disorder marked by difficulty remembering important personal information and life events.

A psychological disorder characterized by an excessive amount of worry and anxiety about activities relating to family, health, school, and other aspects of daily life.

A psychological disorder marked by dramatic swings in mood, ranging from manic episodes to depressive episodes.

A group of psychological disorders that can include impairments in cognition, emotional responses, interpersonal functioning, and impulse control.

An approach suggesting that psychological disorders are illnesses that have underlying biological causes.

Behavior that is atypical, dysfunctional, distressful, and/or deviant.