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  2. Positive feedback - Wikipedia

    en.wikipedia.org/wiki/Positive_feedback

    Audio feedback (also known as acoustic feedback, simply as feedback, or the Larsen effect) is a special kind of positive feedback which occurs when a sound loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a loudly-amplified loudspeaker).

  3. Biochemical switches in the cell cycle - Wikipedia

    en.wikipedia.org/wiki/Biochemical_switches_in...

    The interaction between the two types of loops is evident in mitosis. While positive feedback initiates mitosis, a negative feedback loop promotes the inactivation of the cyclin-dependent kinases by the anaphase-promoting complex. This example clearly shows the combined effects that positive and negative feedback loops have on cell-cycle ...

  4. Self-perpetuation - Wikipedia

    en.wikipedia.org/wiki/Self-perpetuation

    In a social context, self-perpetuation is tied to reflexivity and (usually) positive feedback loops: To overcome strong prior beliefs, strong evidence to the contrary is needed. If a person is predisposed to choosing a certain action, the advice from an advisor who sets a low threshold for recommending the alternative action is not of much use.

  5. Feedback - Wikipedia

    en.wikipedia.org/wiki/Feedback

    A feedback loop is created when all or some portion of the output is fed back to the input. A device is said to be operating open loop if no output feedback is being employed and closed loop if feedback is being used. [45] When two or more amplifiers are cross-coupled using positive feedback, complex behaviors can be created.

  6. Bistability - Wikipedia

    en.wikipedia.org/wiki/Bistability

    Bistability can be generated by a positive feedback loop with an ultrasensitive regulatory step. Positive feedback loops, such as the simple X activates Y and Y activates X motif, essentially link output signals to their input signals and have been noted to be an important regulatory motif in cellular signal transduction because positive ...

  7. Hodgkin cycle - Wikipedia

    en.wikipedia.org/wiki/Hodgkin_Cycle

    The Hodgkin cycle represents a positive feedback loop in which an initial membrane depolarization leads to uncontrolled deflection of the membrane potential to near V Na. The initial depolarization must reach or surpass a certain threshold in order to activate voltage-gated Na + channels .

  8. Cybernetics - Wikipedia

    en.wikipedia.org/wiki/Cybernetics

    Cybernetics is the transdisciplinary study of circular processes such as feedback systems where outputs are also inputs. It is concerned with general principles that are relevant across multiple contexts, [1] including in ecological, technological, economic, biological, cognitive and social systems and also in practical activities such as designing, [2] learning, and managing.

  9. Fergusson reflex - Wikipedia

    en.wikipedia.org/wiki/Fergusson_reflex

    This causes myometrial contraction and further positive feedback on the reflex. [1] [2] Studies among ewes demonstrated that the Ferguson reflex is blocked by epidural anesthesia. [3] In their studies among mice, Niles Newton and colleagues demonstrated the importance of cortical influences. [4]