Occlusion

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Occlusion

Occlusion is a term indicating that the state of something, which is normally open, is now totally closed.

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Occlusion is a term indicating that the state of something, which is normally open, is now totally closed.

In medicine
Medicine

Medicine is the art and science of healing. It encompasses a range of health care practices evolved to maintain and restore health by the prevention and treatment of illness....
, the term is often used to refer to blood vessel
Blood vessel

The blood vessels are the part of the circulatory system that transport blood throughout the body. There are three major types of blood vessels: the artery, which carry the blood away from the heart, the capillary, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from...
s, arteries
Artery

Arteries are blood vessels that carry blood away from the heart. All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood....
or vein
Vein

In the circulatory system, veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary vein and umbilical veins, both of which carry oxygenated blood....
s which have become totally blocked to any blood flow
Blood flow

Blood flow is the flow of blood in the cardiovascular system.It can be calculated by dividing the vascular resistance into the pressure gradient....
. For issues of artery occlusion, see stenosis
Stenosis

A stenosis is an abnormal narrowing in a blood vessel or other tubular Organ or structure.It is also sometimes called a "stricture" .The term "coarctation" is synonymous, but is commonly used only in the context of aortic coarctation....
, atheroma
Atheroma

In pathology, an atheroma is an accumulation and swelling in artery walls that is made up of cells , or cell debris, that contain lipids , calcium and a variable amount of fibrous connective tissue....
, and coronary catheterization
Coronary catheterization

A coronary catheterization is a minimally invasive procedure to access the coronary circulation and blood filled chambers of the heart using a catheter....
.

In audiology
Audiology

Audiology is the branch of Science that studies hearing, balance and related disorders. Its practitioners, who treat those with hearing loss and proactively prevent related damage are audiologists....
, occlusion refers to the phenomenon that when persons with normal hearing close off the opening into the ear canal, the loudness of low pitched sounds (presented by bone conduction) increases.

In dentistry
Dentistry

Dentistry is the known evaluation, diagnosis, prevention, and treatment of diseases, disorders and conditions of the mouth, maxillofacial area and the adjacent and associated structures and their impact on the human body....
, occlusion
Occlusion (dentistry)

Occlusion, in a dental context, means simply the contact between teeth. More technically, it is the relationship between the maxilla and mandible teeth when they approach each other, as occurs during chewing or at rest....
refers to the manner in which the teeth from upper and lower arches come together when the mouth is closed.

In psychology
Psychology

Psychology is an academic and applied science discipline involving the science study of human mental functions and behavior. Occasionally it also relies on symbolic hermeneutics and critical theory, although these traditions are less pronounced than in other social sciences such as sociology....
, specifically memory
Memory

In psychology, memory is an organism's mental ability to store, retain and recall information. Traditional studies of memory began in the fields of philosophy, including techniques of mnemonic....
research, occlusion is the phenomenon of items associated to the same cue as the target blocking the successful retrieval of that target, through strength dependent response competition. The tip-of-the-tongue
Tip of the tongue

The tip of the tongue phenomenon is an instance of knowing something that cannot immediately be recalled. TOT is an experience with memory recollection involving difficulty retrieving a well-known word or familiar name....
phenomenon is an example of occlusion.

In meteorology
Meteorology

Meteorology is the interdisciplinary scientific study of the Earth's atmosphere that focuses on weather processes and forecasting . Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century....
, the term refers to the complex frontal structure formed when a cold front
Cold front

A cold front is defined as the leading edge of a cooler and drier mass of air, replacing a warmer mass of air.Development of cold front...
overtakes a warm front
Warm front

A warm front is defined as the leading edge of an advancing Air mass of warm air; it separates warm air from the colder air ahead....
. It is associated with widespread, steady rainfall in advance of the occluded front
Occluded front

An occluded front is formed during the process of cyclogenesis when a cold front overtakes a warm front. When this occurs, the warm air is separated from the cyclone center at the Earth's surface....
. In addition to extratropical cyclone
Extratropical cyclone

Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are a group of cyclones defined as Synoptic scale meteorology Low pressure area weather systems that occur in the middle latitudes of the Earth having neither tropical cyclone nor polar cyclone characteristics, and are connected with Surface weath...
s on the synoptic scale
Synoptic scale meteorology

The synoptic scale in meteorology is a horizontal length scale of the order of 1000 kilometres or more . This corresponds to a horizontal scale typical of mid-latitude Depression ....
, occlusions also occur on the mesoscale
Mesoscale meteorology

Mesoscale Meteorology is the study of weather systems smaller than synoptic scale systems but larger than Microscale meteorology and storm-scale cumulus systems....
, as when a rear flank downdraft
Rear flank downdraft

The rear flank downdraft or RFD is a region of dry air wrapping around the back of a mesocyclone in a supercell thunderstorm. These areas of descending air are thought to be essential in the production of many supercellular tornadoes....
occludes in a supercell
Supercell

A supercell is a thunderstorm that is characterized by the presence of a mesocyclone; a deep, continuously-rotating vertical draft. Of the four classifications of thunderstorms , supercells are the largest and have the potential to be the most severe....
thunderstorm.

In computer graphics
Computer graphics

Computer graphics are graphics created by computers and, more generally, the representation and manipulation of pictorial data by a computer....
, the term is used to describe the manner in which an object closer to the viewport masks (or occludes) an object further away from the viewport. In the graphics pipeline
Graphics pipeline

In 3D computer graphics, the terms graphics pipeline or rendering pipeline most commonly refer to the current state of the art method of rasterization-based rendering as supported by commodity graphics hardware....
, a form of occlusion culling is used to remove hidden surfaces before shading
Shading

Shading refers to wikt:depicting depth in 3D models or illustrations by varying levels of darkness....
and rasterizing take place.

In computer gaming audio engines, the term describes modification of the qualities of a sound that passes through or around an object so that the player experiences a greater sense of realism. For example, a sound that comes from behind a door realistically sounds as if it passed through a door.

Occlusion

See also