threshold


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threshold

 [thresh´old]
1. the level that must be reached for an effect to be produced, as the degree of intensity of stimulus that just produces a sensation.
2. that value at which a stimulus just produces a sensation, is just appreciable, or comes just within the limits of perception.
auditory threshold the slightest perceptible sound.
threshold of consciousness the lowest limit of sensibility; the point of consciousness at which a stimulus is barely perceived.
defibrillation threshold DFT; the minimum amount of energy in joules that will consistently terminate ventricular fibrillation.
fibrillation threshold the least intensity of an electrical impulse that will cause cardiac tissue to begin fibrillation.
pacing threshold the minimal electrical stimulus required to produce consistent cardiac depolarization.
renal threshold that concentration of a substance (threshold substance) in plasma at which it begins to be excreted in the urine.
sensing threshold in cardiac pacing terminology, the voltage of the minimum signal that consistently activates pulse generator function.

thresh·old

(thresh'ōld), Avoid the misspelling/mispronunciation threshhold.
1. The point at which a stimulus first produces a sensation.
2. The lower limit of perception of a stimulus.
3. The minimal stimulus that produces excitation of any structure, for example, the minimal stimulus eliciting a motor response.
Synonym(s): limen (2) [TA]
[A.S. therxold]

threshold

(thrĕsh′ōld′, -hōld′)
n.
The point that must be exceeded to begin producing a given effect or result or to elicit a response: a low threshold of pain.

threshold

Medtalk The point, stage, or degree of intensity at which a particular effect occurs or action is taken. See Therapeutic threshold, Transfusion threshold.

thresh·old

(thresh'ōld)
1. The level of intensity at which a stimulus first produces a sensation.
2. The lower limit of perception of a stimulus.
3. The minimal stimulus that produces excitation of any structure.
4. Synonym(s): limen.
[A.S. therxold]

threshold

the level at which a STIMULUS results in a response and below which there is no response despite the application of a stimulus.

threshold 

The value of a stimulus that just produces a response. Syn. limen.
absolute threshold The minimum luminance of a source that will produce a sensation of light. It varies with the state of dark adaptation, the retinal area stimulated, the wavelength of light, etc. Syn. light threshold. See photochromatic interval.
contrast threshold See differential threshold.
corneal touch threshold See corneal touch threshold.
differential threshold The smallest difference between two stimuli presented simultaneously that gives rise to a perceived difference in sensation. The difference may be related to brightness, but also to colour and specifically to either saturation (while hue is kept constant) or hue (while saturation is kept constant). The differential threshold of luminance is equal to about 1% in photopic vision. Syn. contrast threshold (if the difference is one of luminance); just noticeable difference (jnd). See Weber's law; contrast sensitivity.
light threshold See absolute threshold.
movement threshold 1. The minimum motion of an object that can be perceived. 2. The speed at which an object moving between two points just appears to be moving. See hyperacuity; phi movement.
resolution threshold See limit of resolution.
stereo-threshold See stereoscopic visual acuity.

thresh·old

(thresh'ōld) Avoid the misspelling threshhold.
1. Point at which a stimulus first produces a sensation.
2. Lower limit of perception of a stimulus.
[A.S. therxold]
References in periodicals archive ?
Multichannel sellers also need to determine how marketplace facilitator laws interact with the seller's economic nexus thresholds. Typically, thresholds are based on in-state sales through all channels, but some exceptions may arise if the seller makes sales only through marketplace facilitators that collect the applicable sales or use tax in the state.
The revised thresholds, when met together, are considered triggers for entities to notify PCC of their transactions.
PCC said the revised thresholds do not apply to MandAs pending review, notifiable transactions consummated before March 1, and transactions already subject of a decision by the antitrust body.
The poll body stressed that the 25-percent threshold, not the 50-percent threshold being pushed by the Marcos camp, that was used when the election was conducted.
The students also stressed that the use of 50-percent threshold "will affect not just those who voted for Robredo, but also those who voted for losing candidate Ferdinand Marcos Jr."
The American College of Cardiology supported the expansion of the low-volume threshold and encouraged the agency to review the levels annually.
As the parameters estimated in Mubarik (2005) are negative, both in case of below 9 percent inflation and above 9 percent; it wrongly interprets 9 percent as threshold inflation.
It measured atrial pacing threshold automatically and regularly every 8 or 24 h for out-of-clinic use and immediately by user initiated threshold search for in-clinic use.
This paper first introduces the fundamental principle to determine the misfire threshold. Then it investigates some popular misfire threshold determination methods, and points out their shortcomings.
On a pro forma basis and based upon the number of shares of common stock to be issued in the merger, current Threshold shareholders would own approximately 34.4% of the combined company and current Molecular Templates shareholders would own approximately 65.6% of the combined company although the actual allocation will be subject to adjustment based on Threshold's net cash balance.
At present, the papers on the threshold signature scheme based on SM2 elliptic curve digital signature algorithm are few, so a SM2 elliptic curve threshold signature scheme without a trusted center is proposed in this paper.