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Herpes valtrex dosage


Pavlov considered that braking also is capable to иррадиации and concentration. The braking which has arisen in the analyzer at use of a negative conditional irritant, иррадиирует on

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cerebral cortex, but in 4-5 times more slowly from 20 сек to 5 mines, than excitation.

There is a concentration of braking even more slowly. In process of repetition and fastening of a negative conditioned reflex time of concentration of braking is shortened also braking concentrates in the limited zone of a bark. At research of mutual relations of excitation and braking in a brain bark it has been established that within several seconds after influence of a brake irritant the effect of positive conditional irritants amplifies.

And on the contrary, after application of positive conditional

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action of braking irritations amplifies.

The first phenomenon is named by I. Pavlovym the negative induction, the second – a positive induction. At a positive induction in cages, adjacent with where braking was just caused, after cancellation of a brake signal there is a hypererethism condition. Thereof the impulses arriving to нейронам at action of a positive irritant, cause the raised effect.

At a negative induction in cages of a bark, associates raised нейроны, there is a braking process. The negative induction limits иррадиацию excitation process

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a brain bark. Negative induction it is possible to explain braking of conditioned reflexes by stronger extraneous irritations external unconditional braking. Such strong irritation causes in a brain bark intensive excitation нейронов round which there is a wide zone of braking нейронов, grasping the cages raised by a conditional irritant.

The phenomena of a negative and positive induction in a cerebral cortex are mobile, constantly replace each other. In different points of a bark of a brain simultaneously there can be centres of excitation and braking, a herpes valtrex dosage and negative induction. Analytical and synthetic activity of a cerebral cortex Cerebral cortex activity provides the constant analysis and synthesis of the signals arriving from the surrounding and internal environment of an organism.

The analysis and synthesis inseparably linked among themselves also cannot occur separately. Synthetic activity of a cerebral cortex is shown by association возбуждений, arising in various zones of a bark of a brain. The major mechanism of this association is formation of time conditioned-reflex communication. At the person synthetic activity of a bark is not limited only to formation of time communications between корковыми representations of unconditioned reflexes and the centres of sense organs.

Essential value has education of time communications centre to centre, participating in perception of complex and consecutive irritations. Analytical activity of a cerebral cortex consists in differentiation on character and intensity of weight of the irritations reaching in the form of signals to a brain bark that is reached by means of the internal braking allowing precisely to differentiate irritants on their biological importance.

The analysis external ивнугренних influences in

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organism begins with the moment of their action on receptors. On the way to корковым нейронам афферентные signals pass a number of formations of the central nervous system where there is their elementary analysis. The higher analysis is carried out in a cerebral cortex.

Properties of nervous processes As properties of valtrex 1gm dosage processes understand such characteristics of excitation and braking, as force, steadiness and mobility of these processes. Force of nervous processes. At measurement of force of process of excitation usually use a curve of dependence of size of conditional reaction at most an irritant. Conditional reaction ceases to increase at certain intensity of a prearranged signal.

This border also characterises force of process of excitation. An indicator of force of brake process is firmness of brake conditioned reflexes, and also speed and durability of development дифференцировочного and a late kind of braking. Steadiness of nervous processes. For definition of steadiness of nervous processes forces of processes of excitation and braking at the given animal are compared. If both processes mutually compensate each other they are counterbalanced and if is not present, that, for example, at development of differentiations failure of brake process if it appears weak can be observed.