feedback

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Related to feedback loop: Negative feedback loop

feedback

 [fēd´bak]
the return of some of the output of a system as input so as to exert some control in the process. Feedback controls are a type of self-regulating mechanism by which certain activities are sustained within prescribed ranges. For example, the serum concentration of oxygen is affected in part by the rate and depth of respirations and is, therefore, an output of the respiratory system. If the concentration of oxygen drops below normal, this information is transmitted as input to the respiratory control center. The control center is thereby stimulated to increase the rate of respirations in order to return the oxygen concentration in the blood to within normal range.

This series of events is an example of negative feedback, which always causes the controller to respond in a manner that opposes a deviation from the normal level (setpoint). It is, therefore, a corrective action that returns a factor within the system to a normal range. Positive feedback tends to increase a deviation from the setpoint. In other words, positive feedback reinforces and accelerates either an excess or deficit of a factor within the system. See also homeostasis.
Physiologic example of negative feedback. From Applegate, 2000.
alpha feedback alpha biofeedback.

feed·back

(fēd'bak),
1. In a given system, the return, as input, of some of the output, as a regulatory mechanism; for example, regulation of a furnace by a thermostat.
2. An explanation for the learning of motor skills: sensory stimuli set up by muscle contractions modulate the activity of the motor system.
3. The feeling evoked by another person's reaction to oneself.

feedback

(fēd′băk′)
n.
1.
a. The return of a portion of the output of a process or system to the input, especially when used to maintain performance or to control a system or process.
b. The portion of the output so returned.
c. Sound created when a transducer, such as a microphone or the pickup of an electric guitar, picks up sound from a speaker connected to an amplifier and regenerates it back through the amplifier.
2. The return of information about the result of a process or activity; evaluative response: asked the students for feedback on the new curriculum.
3. The process by which a system, often biological or ecological, is modulated, controlled, or changed by the product, output, or response it produces.

feed·back

(fēd'bak)
1. In a given system, the return, as input, of some of the output, as a regulatory mechanism (e.g., regulation of a furnace by a thermostat).
2. An explanation for the learning of motor skills: sensory stimuli set up by muscle contractions modulate the activity of the motor system.
3. The feeling evoked by another person's reaction to oneself.
See: biofeedback

feedback

A feature of biological and other control systems in which some of the information from the output is returned to the input to exert either a potentiating effect (positive feedback) or a dampening and regularizing effect (negative feedback). Too much positive feedback produces a runaway effect often with oscillation.

feed·back

(fēd'bak)
1. In a given system, the return, as input, of some of the output, as a regulatory mechanism; e.g., regulation of a furnace by a thermostat.
2. An explanation for the learning of motor skills: sensory stimuli set up by muscle contractions modulate the activity of the motor system.
3. The feeling evoked by another person's reaction to oneself.
See: biofeedback
References in periodicals archive ?
The feedback loop presents dynamic components that can help librarians and patrons alike evaluate and re-evaluate successes, challenges, and future modifications, and the feedback loop need not be relegated to the screen.
Given the reciprocal nature of relationship, it is expected that there might be a feedback loop between diabetes control and quality of life of diabetic patients.
From Question Pair #4 about Young Bob and Old Bob, we see that a feedback loop across time is not permissible.
As the central negative feedback loop shows oscillation, the additional loops should show oscillation or stable steady state for ?CA1?
Positive feedback loops often behave unpredictably, so their behaviors are difficult to express as mathematical formulas.
I was familiar with the topics and enjoyed learning about the explanation of evolution in the frame of the seven principles and the interconnected feedback loops. There are certainly some interesting ideas in the evolution section that we can take back to the classroom.
This feedback loop raises the trust level within the email ecosystem
The root cause of this trap is a weak feedback loop. Public finance officers commonly encounter this trap with internal services such as information technology.
* The ability to set motor speeds manually, remotely, or using a proportional feedback loop via dipswitches.
The discovery of a blood cell "feedback loop" in the body opens up new avenues of research into diseases caused by stem cell disorders, and the potential for new disease treatments.
SD's basic tenet is that the structure of feedback loop relations in a system gives rise to its dynamics (Sterman, 2000, p.