a self-organizing system that indicates the ability of living organisms to maintain certain quantities (for example, of body temperature) within physiologically permissible limits (homeostasis).

The English scientist W. R. Ashby, the inventor of the homeostat, constructed it in 1948 as a device consisting of four magnetic systems having crossed reverse connections. Each connection is regulated with the aid of a ring rheostat with taps that switch over when the magnets shift, providing the system with several hundred thousand different states. When there is an unstable state the magnets shift, randomly changing the pattern of homeostat connections: a new position is sought in which a state of equilibrium is achieved. The homeostat has the ability to organize itself: that is, it can to a certain degree learn and adjust through its behavioral patterns to an equilibrium with the environment, given some randomness in its internal construction (for example, given changing parameters, connections with the environment, and partial breakage).


Ivakhnenko, A. G. Tekhnicheskaia kibernetika: Sistemy avto-maticheskogo upravleniia s prisposobleniem kharakteristik, 2nd ed. Kiev, 1962.
“Ustroistvo dlia modelirovaniia gruppovoi vzaimozavisimoi deiatel’nosti (gomeostat).” In Problemy inzhenernoi psikhologii, vol. 3, part 2. Moscow, 1968.
Ashby, W. R. Vvedenie v kibernetiku. Moscow, 1959. (Translated from English.)


References in periodicals archive ?
More specifically, we're going to discuss what Dilman called the adaptive homeostat, the system that the body uses to cope with stress.
Based upon Oilman's theory, stress-related damage occurs due to dysfunction in the adaptive homeostat, the hypothalamus-pituitary-adrenal (HPA) axis.
And so the cycle continues, ensuring that the adaptive homeostat works in a balanced manner.
If the adaptive homeostat is working properly, basal morning cortisol levels should be twice those of nighttime.
Oilman's work showed that the way to restore optimal function of the adaptive homeostat, relieve hyperadaptosis, and ultimately reduce the damaging effects of stress is to restore hypothalamic (and peripheral) receptor sensitivity and to use hormone replacement therapy to restore hormone levels to what they were when the body was younger.
A combination of herbs known as adaptogens can be used effectively to resensitize the hypothalamus and restore the adaptive homeostat.
To rejuvenate the adaptive homeostat, Dilman also advocated supplementing with natural hormones to restore them to their youthful levels.
such tensions, and far from being a 'sophisticated homeostat that
In 1969, Willats drew abstract renderings of William Ross Ashby's self-regulating Homeostat system, replete with connective arrows, which would influence his formal language from that point forward.
Sleep is controlled by your internal body clock and also by your sleep homeostat, which is like an egg timer you flip over in the morning, allowing sleepiness to build up gradually through the day," says chronobiologist Dr Victoria Revell.
This suggests a possible reduction in sleep drive, and by inference, a faulty sleep homeostat.
The first is the genotypal homeostat whose hard-wired instincts guarantee a swift response to standard environmental stimuli.