Glossary of psychiatry

This glossary covers terms found in the psychiatric literature; the word origins are primarily Greek, but there are also Latin, French, German, and English terms. Many of these terms refer to expressions dating from the early days of psychiatry in Europe. Abreaction is a process of vividly reliving repressed memories and emotions related to a past event. Sigmund Freud used hypnosis to rid his patients of pathological memories through abreaction. Aboulia or Abulia, in neurology, refers to a lack of will or initiative. The individual is unable to act or make decisions independently. The condition may range from subtle to overwhelming in severity. Achromatopsia is a term referring to or acquired agnosia for color. This term includes color blindness. Achromatopsia is a condition characterized by a partial or total absence of color vision. People with complete achromatopsia cannot perceive any colors; they see only black, white, and shades of gray. Incomplete achromatopsia is a milder form of the condition that allows some color discrimination. Achromatopsia also involves other problems with vision, including an increased sensitivity to light and glare (photophobia), involuntary back-and-forth eye movements (nystagmus), and significantly reduced sharpness of vision (low visual acuity). Affected individuals can also have farsightedness (hyperopia) or, less commonly, nearsightedness (myopia). These vision problems develop in the first few months of life. Achromatopsia is different from the more common forms of color vision deficiency (also called color blindness), in which people can perceive color but have difficulty distinguishing between certain colors, such as red and green. Mild illusions or misperceptions associated with changes in mood; e.g. mistaking a shadow for the presence of a person, perceiving movement in peripheral when there is none. Akataphasia (Kraepelin 1896) refers to a syntactic disturbance of speech resulting from dissolution of logical ordering of thoughts. It manifests as rambling speech.