what is positive and negative feedback:
Feedback is a mechanism of control systems in which the results of a task or activity are reintroduced into the system in order to influence or acting on decisions or future actions, either to maintain the balance in the system, good to drive the system towards a new one. In this sense, we can talk about two types of feedback: the positive and the negative.
Negative feedback is the control and regulation of the processes on a system. As such, it is responsible for maintain the balance within the system, counteracting or modifying the consequences of certain actions. There that is associated to homeostatic processes or self-regulatory.
For example: ask us to develop ten tasks in five hours, but we are able to perform them in three. He is then requires us to we use the five hours at the next opportunity for the realization of the ten tasks. There has been a negative feedback process to bring the system back to its original balance, based on the quality of the execution of the tasks.
Positive feedback, for its part, is responsible for amplify or boost certain changes or deviations introduced in a system, so that it can evolve or grow into a new State of equilibrium, different from the previous.
For example: ask us again develop ten tasks in five hours, and we are capable of having them resolved in just three hours. Then, congratulate us and asked us to continue reducing the amount of time we spend on tasks. There the feedback has been positive, the system is looking for a new equilibrium based on efficiency.
The purpose of positive and negative feedback processes is always focused on optimizing the performance of the systems, according to certain patterns and criteria. As such, it is a mechanism that applies virtually to any process that involves the control and adjustment of a system. In this sense, is used in areas such as communication, psychology, business management, electronics, education and medicine.
Feedback in Physiology
In the field of Physiology, medicine, feedback is a concept that refers to the mechanism of control of many physiological processes of the body. As such, there are two types: the positive feedback and the refusal.
Negative feedback: is one that produces an effect contrary to the initial stimulus. This means that if some factor within the organism becomes excessive or insufficient, the negative feedback Act to return the body to its normal levels. As such, it is a system of regulation and control of the organic functions. Positive feedback: it is one that, from an initial stimulus, replies promoting or amplifying the reaction of the organism. This can occur as a result of a deficiency or excess of some factor in the body. There need positive feedback negative to its regulation.
In this sense, if it occurs, for example, a gland of the endocrine system produces certain hormone in excessive quantities, will need positive feedback to decrease production hormone and, subsequently, the negative feedback to regulate the production of hormones in the body.
There are considered both the positive and negative feedback to work together to maintain homeostasis in the human body, i.e., the phenomena of self-regulation which lead to the maintenance of an organism.
Homeostasis and negative feedback
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