Threshold may refer to:

Science

Biology

Threshold (reference value) In medicine and health-related fields, a reference range or reference interval is the range (statistics), range or the interval (mathematics), interval of values that is deemed normal for a physiology, physiological measurement in healthy persons ...

Absolute threshold In neuroscience and psychophysics, an absolute threshold was originally defined as the lowest level of a stimulus – light, sound, touch, etc. – that an organism could detect. Under the influence of signal detection theory, absolute threshold ...

Absolute threshold of hearing The absolute threshold of hearing (ATH), also known as the absolute hearing threshold or auditory threshold, is the minimum sound level of a pure tone that an average human ear with normal hearing can hear with no other sound present. The absolu ...

Action potential An action potential (also known as a nerve impulse or "spike" when in a neuron) is a series of quick changes in voltage across a cell membrane. An action potential occurs when the membrane potential of a specific Cell (biology), cell rapidly ri ...

Aerobic threshold Lactate inflection point (LIP) is the exercise intensity at which the blood concentration of lactate and/or lactic acid begins to increase rapidly. It is often expressed as 85% of maximum heart rate or 75% of maximum oxygen intake. When exercisin ...

Anaerobic threshold Lactate inflection point (LIP) is the exercise intensity at which the blood concentration of lactate and/or lactic acid begins to increase rapidly. It is often expressed as 85% of maximum heart rate or 75% of maximum oxygen intake. When exercisin ...

* Dark adaptation threshold * Epidemic threshold *

Flicker fusion threshold The flicker fusion threshold, also known as critical flicker frequency or flicker fusion rate, is the frequency at which a flickering light appears steady to the average human observer. It is a concept studied in vision science, more specificall ...

* Masking threshold *

Odor detection threshold The odor detection threshold is the lowest concentration of a certain odor compound that is perceivable by the human sense of smell. The threshold of a chemical compound is determined in part by its shape, polarity, partial charges, and mole ...

* Renal threshold *

Seizure threshold The term seizure threshold is used to describe the balance between excitatory (glutaminergic) and inhibitory (GABA-ergic) forces in the brain which affect how susceptible a person is to seizures. Those diagnosed with epilepsy or certain other neuro ...

Sensory threshold In psychophysics, sensory threshold is the weakest stimulus that an organism can sense. Unless otherwise indicated, it is usually defined as the weakest stimulus that can be detected half the time, for example, as indicated by a point on a probabi ...

Threshold expression Mitochondrial threshold effect is a phenomenon where the number of mutated mtDNA has surpassed a certain threshold which causes the electron transport chain and ATP synthesis of a mitochondrion to fail. There isn't a set number that needs to be surp ...

* Threshold limit value *

Threshold model In mathematical or statistical modeling a threshold model is any model where a threshold value, or set of threshold values, is used to distinguish ranges of values where the behaviour predicted by the model varies in some important way. A particu ...

Threshold of pain The threshold of pain or pain threshold is the point along a curve of increasing perception of a stimulus at which pain begins to be felt. It is an entirely subjective phenomenon. A distinction must be maintained between the stimulus (an extern ...

Threshold potential In electrophysiology, the threshold potential is the critical level to which a membrane potential must be depolarized to initiate an action potential. In neuroscience, threshold potentials are necessary to regulate and propagate signaling in both ...

Other science-related

Ecological threshold Ecological threshold is the point at which a relatively small change or disturbance in external conditions causes a rapid change in an ecosystem. When an ecological threshold has been passed, the ecosystem may no longer be able to return to its st ...

* Error threshold (evolution) *

Extinction threshold Extinction threshold is a term used in conservation biology to explain the point at which a species, population or metapopulation, experiences an abrupt change in density or number because of an important parameter, such as habitat loss. It is at t ...

Lasing threshold The lasing threshold is the lowest excitation level at which a laser's output is dominated by stimulated emission rather than by spontaneous emission. Below the threshold, the laser's output power rises slowly with increasing excitation. Above thr ...

Percolation threshold The percolation threshold is a mathematical concept in percolation theory that describes the formation of long-range connectivity in Randomness, random systems. Below the threshold a giant connected component (graph theory), connected componen ...

Polygyny threshold model The polygyny threshold model is an evolutionary explanation of polygyny, the mating of one male of a species with more than one female. The model shows how females may gain a higher level of biological fitness by mating with a male who already has ...

Threshold cryptosystem A threshold cryptosystem, the basis for the field of threshold cryptography, is a cryptosystem that protects information by encrypting it and distributing it among a cluster of fault-tolerant computers. The message is encrypted using a public key, ...

Threshold displacement energy In materials science, the threshold displacement energy () is the minimum kinetic energy that an atom in a solid needs to be permanently displaced from its site in the lattice to a defect position. It is also known as "displacement threshold ene ...

Threshold energy In particle physics, the threshold energy for production of a particle is the minimum kinetic energy that must be imparted to one of a pair of particles in order for their collision to produce a given result. If the desired result is to produce a t ...

Threshold graph In graph theory, a threshold graph is a graph that can be constructed from a one-vertex graph by repeated applications of the following two operations: # Addition of a single isolated vertex to the graph. # Addition of a single dominating vertex ...

Threshold knowledge Threshold knowledge is a term in the study of higher education used to describe core concepts—or threshold concepts—which, once understood, transform perception of a given subject, phenomenon, or experience.Meyer J H F and Land R 2003 "Threshold ...

Threshold voltage The threshold voltage, commonly abbreviated as Vth or VGS(th), of a field-effect transistor (FET) is the minimum gate-to-source voltage (VGS) that is needed to create a conducting path between the source and drain terminals. It is an important s ...

Thresholding (image processing) In digital image processing, thresholding is the simplest method of segmenting images. From a grayscale image, thresholding can be used to create binary images. Definition The simplest thresholding methods replace each pixel in an image with a ...

Transparency threshold In data compression and psychoacoustics, transparency is the result of lossy data compression accurate enough that the compressed result is perceptually indistinguishable from the uncompressed input, i.e. perceptually lossless. A transparency ...

Architecture

* Threshold (architecture), the sill of a door

Literature

* ''Threshold'' (1990 novel), a science fiction novel by Chris and Janet Morris * ''Threshold'' (Sara Douglass novel), a fantasy novel * ''Threshold'' (Palmer novel), a science fiction novel by David R. Palmer * ''Threshold'', the first volume of the collected short fiction of

Roger Zelazny Roger Joseph Zelazny (May 13, 1937 – June 14, 1995) was an American fantasy and science fiction writer known for his short stories and novels, best known for '' The Chronicles of Amber''. He won the Nebula Award three times (out of 14 nominatio ...

* ''Threshold'' (DC Comics), a comic book published by DC Comics * ''Threshold'', a science-fiction novel by Caitlín R. Kiernan * ''Threshold'', a Christian novel by Bill Myers (author) * ''Threshold'', a science-fiction novel by

Ben Mezrich Ben Mezrich ( ; born February 7, 1969) is an American author. He has written well-known non-fiction books, including '' The Accidental Billionaires'' and '' The Antisocial Network'', which have been turned into the films ''The Social Network'' ...

* Threshold Editions, a conservative imprint

Media

* ''Threshold'' (1981 film) * ''Threshold'', a 2008 film directed by

Deepak Rauniyar Deepak Rauniyar (; born on 29 August 1978) is a Nepalese director, writer and producer. He is one of the few internationally acclaimed cinema directors from Nepal. He rose to prominence in 2012 as the director of ''Highway'', the first Nepali mo ...

* ''Threshold'' (TV series), an American science fiction drama TV series * "Threshold" (''Stargate SG-1''), an episode of the TV series * "Threshold" (''Star Trek: Voyager''), an episode of the TV series * Threshold Entertainment, a Hollywood Intellectual Property Management and Production Company *

Threshold Podcast ''Threshold'' is a podcast and radio show that tackles one pressing environmental story each season. The podcast explores the intersections of environment, history, culture, science, politics and social justice, focusing on the human relationships ...

, a podcast focused on long-form reporting of climate justice topics

Music

Threshold (band) Threshold are an English progressive metal band formed in Surrey in the late 1980s. The guitarist and producer Karl Groom has been the band's only consistent member. History 1988–1992 Threshold began their career in 1988, initially play ...

, a UK progressive metal band *

Threshold House Threshold House is one of several record labels created by Coil to release their own work and that of affiliated projects. Associated labels include Eskaton and Chalice. It is also the name for the official Coil website. The label was initi ...

, a record label created by Coil *

Threshold Records Threshold Records was a record label created by the rock music group Moody Blues. The name of the label came from their 1969 album ''On the Threshold of a Dream''. The band formed this label to allow for artistically packaged gatefold covers for ...

, a record label created by The Moody Blues

Albums

* ''Threshold'' (album), a 2006 album by HammerFall * ''Thresholds'' (album), a 1992 album by Nocturnus * ''Threshold'', a 1997 album by Erik Norlander

Songs

* "Threshold", by

Pocahaunted Pocahaunted (often shortened by the band to P-haunt) was a hypnagogic pop project based in Los Angeles, California founded in 2005 by Amanda Brown and Bethany Cosentino. History Amanda Brown founded Not Not Fun Records in 2005; she and friend Be ...

, 2010 * "Threshold", by Sex Bob-Omb from the ''Scott Pilgrim vs. the World'' soundtrack, 2010 * "Threshold", by Slayer from ''

God Hates Us All ''God Hates Us All'' is the ninth studio album by American thrash metal band Slayer, released on September 11, 2001, by American Recordings (US), American Recordings. It was recorded over three months at The Warehouse Studio in Vancouver, and inc ...

'', 2001 * "Threshold", by the Steve Miller Band from ''

Book of Dreams ''Book of Dreams'' is the tenth studio album by Steve Miller Band. The album was released in May 1977 on Capitol Records in the United States, Canada and Japan and by Mercury Records in Europe. Three singles were released from the album in 1977 ...

'', 1977 * "Threshold", by Turnover from ''

Peripheral Vision Peripheral vision, or ''indirect vision'', is vision as it occurs outside the point of fixation, i.e. away from the center of gaze or, when viewed at large angles, in (or out of) the "corner of one's eye". The vast majority of the area in the ...

'', 2015 * "The Threshold", by Connie Smith from ''

Connie Smith Connie Smith (born Constance June Meador; August 14, 1941) is an American country music singer and songwriter. Her contralto vocals have been described by music writers as significant and influential to the women of country music. A similarity ...

'', 1965

Other uses

* ''Threshold'' (video game), a 1981 video game *

Thresholds Thresholds is a 501(c)(3) nonprofit organization founded in 1959 serving persons with mental illnesses and substance abuse problems in Illinois. Thresholds is the largest community-based mental healthcare provider in Illinois, providing service ...

, a nonprofit organization serving persons with mental illnesses and substance abuse problems in Illinois * Threshold Audio, a manufacturer of high end audio amplifiers *

Displaced threshold A displaced threshold or DTHR is a runway threshold located at a point other than the physical beginning or end of the runway. The portion of the runway behind a displaced threshold may be used for takeoff in either direction and landings from t ...

, an aviation term *

Election threshold The electoral threshold, or election threshold, is the minimum share of votes that a candidate or political party requires before they become entitled to representation or additional seats in a legislature. This limit can operate in various w ...

, a concept in voting systems * Poverty thresholds (United States Census Bureau) *In

government procurement Government procurement or public procurement is the purchase of goods, works (construction) or services by the state, such as by a government agency or a state-owned enterprise. In 2019, public procurement accounted for approximately 12% of GDP ...

, the expenditure value which determines which rules and procedures are to be applied to a proposed purchase