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Effects of feedback

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...

Feedback control systems

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...

Feedback Inhibition

Feedback Inhibition

Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!

Open and closed-loop control systems

Open and closed-loop control systems

Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...

Feedback Loops

Feedback Loops

In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.

Positive and Negative Feedback Loops

Positive and Negative Feedback Loops

Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:

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Related Experiment Video

Updated: Jun 18, 2026

Force and Position Control in Humans - The Role of Augmented Feedback

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Concurrent versus terminal feedback: it may be better to wait.

Catharine M Walsh¹, Simon C Ling, Charlie S Wang

¹Wilson Centre, 200 Elizabeth Street, Eaton South 1E-583, Toronto, ON, Canada, M5G 2C5.

Academic Medicine : Journal of the Association of American Medical Colleges

|November 13, 2009

Summary

Terminal feedback, provided after each practice trial, enhanced technical skills learning in novice endoscopists more effectively than concurrent feedback during simulation-based education.

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A Two-interval Forced-choice Task for Multisensory Comparisons

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Last Updated: Jun 18, 2026

Force and Position Control in Humans - The Role of Augmented Feedback

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Published on: June 19, 2016

A Two-interval Forced-choice Task for Multisensory Comparisons

A Two-interval Forced-choice Task for Multisensory Comparisons

Published on: November 9, 2018

Area of Science:

Medical Education
Surgical Simulation
Skill Acquisition

Background:

Simulation-based education is crucial for developing technical skills.
Optimal feedback timing in simulation training requires investigation.

Purpose of the Study:

To determine the most effective timing for feedback in technical skills acquisition.
To compare concurrent versus terminal feedback in novice endoscopists.

Main Methods:

Thirty novice endoscopists practiced a colonoscopy simulator task.
Feedback was administered either concurrently or terminally after each trial.
Performance was assessed via pre-, post-, retention, and transfer tests.

Main Results:

Both concurrent and terminal feedback groups showed similar performance on immediate and retention tests.
The terminal feedback group demonstrated significantly superior transfer performance.
Concurrent feedback led to a performance decrease on transfer tests.

Conclusions:

Feedback timing significantly impacts learning outcomes in simulation-based training.
Terminal feedback promotes better skill transfer compared to concurrent feedback.