lasix and dogs

lasix and dogs

Late braking is characterised by that conditional

lasix and dogs

to a conditional irritant arises before action of an unconditional irritant.

At interval increase between the beginning of action of a conditional irritant and the reinforcement moment to 2-3 mines conditional reaction more and more is late and starts to arise directly ahead of a reinforcement presentation. Backlog of conditional reaction from the beginning of action of a conditional irritant testifies to development of late braking as the braking period corresponds to the period of delay of a reinforcement.

Conditional braking gives the chance to an organism to get rid of a considerable quantity of superfluous biologically inexpedient reactions. Internal

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on P. Anokhin grows out of struggle of two streams возбуждений at their exit on эффекторы.

At угасательном braking, for example, food слюноотделительного a conditioned reflex is a stream возбуждений corresponding reaction and a stream возбуждений, characteristic for biologically negative reaction, arising приотсутствии reinforcements.

Stronger, dominating excitation of reaction of dissatisfaction brakes less strong, food excitation. Other-wordly braking This kind of braking differs from external

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internal occurrence on the mechanism and physiological value. It arises at excessive increase in force or duration of action of a conditional irritant because force of an irritant exceeds working capacity корковых cages.

This braking has guarding value as interferes with an exhaustion of nervous cages. On the mechanism it reminds the phenomenon пессимума which has been described by N. Vvedensky. Other-wordly braking can be caused by action not only very strong irritant, but also action small on force, but long and monotonous irritation on character.

This irritation, constantly operating on same корковые elements, leads to their exhaustion and consequently, it is accompanied by occurrence of guarding braking. Other-wordly braking develops at working capacity decrease is easier, for example, after a heavy infectious disease, stress, develops at older persons is more often. Иррадиация, concentration and an excitation and braking induction In the beginning of formation of a positive conditioned reflex there is a distribution of excitation from direct point of irritation in a brain bark on other departments.

Such distribution I. Pavlov named иррадиацией exciting process. At иррадиации the next nervous cages are involved in excitation process in relation to group of the cages directly raised by come signals. Distribution occurs on associative nervous fibres of a bark which connect nearby the located cages. In иррадиации excitation subcrustal formations and ретикулярная a formation can participate also.

In process of delay of a conditioned reflex excitation concentrates all in more limited zone of a bark to which the irritation is addressed. This phenomenon carries the name of concentration of exciting process. In case of development дифференцировочного braking, it also lasix and dogs excitation.

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 a 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

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seconds after influence of a brake irritant the effect of positive conditional irritants amplifies. And on the contrary, after application of positive conditional irritants 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 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 in a brain bark.

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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 lasix and dogs simultaneously there can be centres of excitation and braking, a positive 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.