Occlusion
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2008-03-19T13:34:19Z
Anomalous result
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{{wiktionary|occlusion}}
'''Occlusion''' is a term indicating that the state of something, which is normally open, is now totally closed.
* In [[medicine]], the term is often used to refer to [[blood vessel]]s, [[artery|arteries]] or [[vein]]s which have become totally blocked to any [[blood flow]]. For issues of artery occlusion, see [[stenosis]], [[atheroma]], and [[coronary catheterization]].
* In [[dentistry]], [[occlusion (dentistry)|occlusion]] refers to the manner in which the teeth from upper and lower arches come together when the mouth is closed.
* In [[psychology]], specifically [[memory]] 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]] phenomenon is an example of occlusion.
* In [[meteorology]], the term refers to the complex [[Weather fronts|frontal]] structure formed when a [[cold front]] overtakes a [[warm front]]. It is associated with widespread, steady rainfall in advance of the [[occluded front]]. In addition to [[extratropical cyclone]]s on the [[synoptic scale meteorology|synoptic scale]], occlusions also occur on the [[mesoscale meteorology|mesoscale]], as when a [[rear flank downdraft]] occludes in a [[supercell]] thunderstorm.
* In [[computer graphics]], 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]], a form of [[occlusion culling]] is used to remove hidden surfaces before [[shading]] and [[rasterizing]] take place.
* In [[audiology]], 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 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.
== See also ==
*[[Occlusive dressing]]
*[[Occlusive]]
*[[Occultation]]
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