The value of membrane potential that must be reached in an excitable cell to trigger an action potential.
The point at which an action is taken; often applied to insects; (most are action thresholds - an action is taken when a level of eggs or caterpillars is reached; or can also be an economic threshold, which takes the commodity and treament cost into consideration).
The transmembrane potential at which an action potential begins.
The smallest input value to a sensor which will cause the sensor to respond. Commonly used with mechanical wind sensors to describe the wind speed necessary to cause the anemometer and wind vane to turn.
1). A phenomenon that can obscure the gene-character relationship. 2). A safe level of economic viability.
The level of some independent variable at which some process changes from one distinct state to another, eg. a temperature threshold above which fish feeding ceases.
In photoelectric sensing, threshold is the point at which adequate received signal level overcomes sensor circuit hysteresis and causes the sensor output to change state. It is also the point at which the light and dark condition are differentiated. Switchpoint threshold may be adjusted using the sensor's sensitivity control (or SET mode or TEACH mode), when available. The threshold is the value of received signal representing an excess gain of 1x.
Minimum depolarization of the membrane potential necessary to evoke an action potential in a neuron
a hearing test finds the quietest sounds a person can hear – their thresholds – across a range of frequencies (pitches of sounds).
The minimum-sized market for an economic activity. The activity will not be successful until it can reach a population larger than this threshold size.
The input level at which lasing begins during excitation of the laser medium.
an ecological discontinuity - the point where the flow of a renewable resource into the economy, or of a waste back to nature, triggers a sudden ecosystem collapse
a range with an alert level (either warning or critical)
a target level for a particular commodity, like food
A designated level that triggers an action in a compressor, gate or expander.
The frequency level required to achieve an effect. (Note: an ad may need to achieve an average frequency of 3 before it is remembered.)
The minimum value of a signal that can be detected by the system or sensor under consideration.
Threshold: There are a number of thresholds used in entomology. The following terms were proposed by Stern et al. for the control of pest insects: 1. Economic Damage: the amount of injury which will justify the cost of artificial control measures." 2. Economic Injury Level: "the lowest population density that will cause economic damage." 3. Economic Threshold: the population density at which control action should be determined (initiated) to prevent an increasing pest population (injury) from reaching the economic injury level." Threshold can also apply to insect development: 1. Lower Developmental Threshold: The minimum temperature at which insect development decreases or stops. 2. Upper Developmental Threshold: The maximum temperature at which insect development decreases or stops.
A level of achievement that determines the difference between what is deemed to be acceptable quality or not. For example, "the minimal acceptable level of coverage for the immunization program is 50 percent," means that every coverage figure less than that is an indication of a quality problem.
The critical value for membrane potential or depolarization at which an action potential is initiated.
This term refers to the level at which usage becomes abusive within a designated category. Thresholds are set by the enterprise on the basis of its Web access policy or guidelines.
The lowest intensity stimulus that can be detected. In most psychometric test the threshold corresponds to a 50% chance of detection. In clinical auditory evoked potentials the constraints of test time usually limit the intensities used to 10dB steps. The threshold may be taken as the minimum intensity at which a repeatable response is identified or some form of interpolation rule may be used. For example the threshold may be taken as the intensity midway between response and non-response levels, providing that the response meets certain criteria such as minimum amplitude or maximum latency.
A minimum level of excitation energy.
The minimum or maximum range of data contained in a report.
The level at which an event or change occurs
The level at which a dynamics processing unit will begin to change gain.
Hearing threshold is defined as the level at which a person hears a sound 50% of the time. This means, it is so soft, that the listener isn't even sure the sound is really there. When the audiologist performs an audiogram, he or she is trying to find the child's threshold of hearing at different pitches across a spectrum from low to high pitch. Threshold can also refer to the softest level of electrical stimulation a child can perceive. In the MED-EL mapping software, the threshold setting of the map is abbreviated as "THR". However, with MED-EL cochlear implants, threshold measures do not significantly impact the quality of the resulting map, and often are not measured.
The minimum level at which a signal of any kind can be detected, either by the human senses or by using any electronic instrumentation
a term used to describe the level of liability genes and environmental triggers needed to cause expression of a multifactorial disorder; the level may differ between males and females.
the level of presence at which certain conditions apply (for example, declaration of presence on a label or bill of lading)
(also cutoff) Sound levels below this point are excluded from dosimeter measurements. National and state regulations determine the threshold level. OSHA uses an 80dB level.
The lowest value of a measured quality at which a sensor responds. Compare to tracking.
In a digital circuit, the signal level that is specified as the division point between levels used to represent different digital values; for example, the sync threshold is the level at which the leading edge of sync begins. See also video waveform.
Continuous tone that establishes a reference point for tuning the detector to ground balance it. The threshold tone also establishes the minimum sound level for deep targets in the discriminate mode.
the minimum level to effect a change.
The intensity level at which a phenomenon starts to occur or ceases occurring.
The point at which a physiological effect begins to be produced, for example, the degree of stimulation of a nerve which produces a response or the level of a chemical in the diet that results in a disease.
The minimum level of support which a party needs to gain representation; usually expressed as a percentage of the total vote.
The level of magnitude of a system process at which sudden or rapid change occurs.
Softest level of intensity at which a person hears a particular sound.
A limit value associated with a specific parameter or attribute of device or network performance. Detection of this value triggers an appropriate response from the local or remote systems or device. For example, when a threshold value is crossed, a warning message can be sent or a module or port can be partitioned.
Level of excitation (depolarization) required to initiate an action potential in excitable tissues such as nerve, muscle or gland.
1. The point at which adequate received signal level overcomes circuit hysteresis and causes the sensor output to change state. 2. The point at which the light and dark condition are differentiated. In some sensors, threshold may be adjusted by using a gain potentiometer, SET mode or TEACH mode.
Minimum point at which an effect is produced or detected.