overshoot


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o·ver·shoot

(ō'vĕr-shūt),
1. Generally, any initial change, in response to a sudden step change in some factor, that is greater than the steady-state response to the new level of that factor; common in systems in which inertia or a time lag in negative feedback outweighs any damping that may be present. Changes in a negative direction are sometimes distinguished by the term undershoot, and the two may alternate in an oscillatory fashion, as in the transient oscillations of a pendulum when released from an initial displacement.
2. Momentary reversal of the membrane potential of a cell (inside becoming positive rather than negative relative to the outside) during an action potential; considered a form of overshoot1 because, before discovery of overshoot2, excitation was thought merely to depolarize the membrane to zero transmembrane potential.

o·ver·shoot

(ō'vĕr-shūt)
1. Any response to a step change in some factor that is greater than the steady-state response to the new level of that factor; common in systems in which inertia or a time lag in negative feedback outweighs any damping that may be present.
2. Momentary reversal of the membrane potential of a cell (inside becoming positive rather than negative relative to the outside) during an action potential.

overshoot

the stage of an ACTION POTENTIAL in which the voltage rises from zero to the positive peak.
References in periodicals archive ?
One-planet prosperity is a simple compass to assess companies' strategies against two essential questions: "Do I operate within one-planet constraints?" and "Do my offers help customers move out of ecological overshoot?", as indicated in the White Paper published today for C-level audiences.
The Global Footprint Network began the hash tag #MOVETHEDATE with the aim of pushing the date of Earth Overshoot Day backward in the coming years.
These standards were amended in 2002, after a number of runway overshoot incidents.
They are designating this as "Overshoot Day"--October 9 in 2006.
In simple laboratory tasks such as pointing to a pre-determined location, researchers have observed that humans have a tendency to undershoot targets more often than overshoot them.
Key words: aberration; median; median method; noise; overshoot; transition duration; trigger jitter; waveform.
(The altitude hold function of the AFCS will overshoot selected altitudes due to limitations on its control authority, especially with a low power setting and high rates of descent.)
The authors present compelling evidence that this focus on growth at all costs has led us into a dangerous phase called "overshoot" in which we've overestimated and overused the Earth's capacity.
The Living Planet Report 2002 was able to assert that there is only a 20 percent overshoot of carrying capacity (when clearly, with world emissions at 6.3 billion tC/yr and the limit to safe emissions at about 2.5 billion tC/yr, the overshoot is actually around 150 percent) because it was imagining it possible to whisk away all existing forest and have it replenished with freshly planted forest absorbing 0.95 tC/ha/yr--and also implicitly assuming that when that forest was fully grown it would again be whisked away and replanted.
"We tend to overshoot. When things are going up, we're not optimistic enough, and we're too optimistic when things are going down."
Bristling with feathers and rife with doodads, they overshoot the decorative in the direction of the voluptuous, sinister, or morbid.