Pavlov has come out with the assumption order xenical at conditioned reflex development there is a formation of time nervous communication between two groups of cages of a bark – корковыми representations of conditional and unconditional reflexes.
Excitation from the conditioned reflex centre can be transferred to the centre of an unconditioned reflex from нейрона to нейрону. Hence, the first way of formation of time communication between корковыми representations of conditional and unconditional reflexes is внутрикортикальным. However at destruction коркового conditioned reflex
the developed conditioned reflex remains. Apparently, formation of time communication
between the subcrustal centre of a conditioned reflex and корковым the unconditioned reflex is xenical over the counter.
At destruction коркового representations of an unconditioned reflex the conditioned reflex also remains. Hence, xenical.com of time communication can go between корковым the centre of a conditioned reflex and the subcrustal centre of xenical.com unconditioned reflex.
Dissociation корковых the centres of conditional and unconditional reflexes by crossing of a bark of a brain does not interfere with conditioned reflex formation. It testifies that time communication can be formed between корковым the conditioned reflex centre, the subcrustal centre of an unconditioned reflex and корковым the unconditioned reflex centre.
Various opinions of mechanisms of education of time communication are had. Probably, formation of time communication occurs by a dominant principle. The centre excitation from an unconditional irritant is always stronger, than from conditional as the unconditional irritant always is biologically more significant for an animal. This centre of excitation is prepotent, hence draws to itself excitation from the centre of conditional irritation.
If excitation has passed on any nervous chains, next time it on these ways will pass much easier the phenomenon проторения ways, At the heart of it lie суммация возбуждений, long increase of excitability синаптических formations, quantity increase медиатора in
, increase in formation new синапсов.
All it creates structural preconditions to simplification of movement of excitation on certain neural chains. Other representation about the mechanism of formation of time communication is конвергентная the theory. In its basis ability нейронов lies to answer irritations of different modalities. On P. Anokhins representations, conditional and unconditional irritants cause widespread activation корковых нейронов thanks to inclusion ретикулярной formations.
As a result ascending signals conditional and unconditional irritants are blocked, i. there is a meeting of
возбуждений on однихи xenical.com same корковых нейронах.
As a result of convergence возбуждений arise and time communications between корковыми representations of conditional and unconditional irritants are stabilised. Conditioned reflexes of the second, the third and higher usages If to develop a strong conditional food reflex, for example, on light such reflex is a conditioned reflex of the first order. On its base it is possible to develop a conditioned reflex of the second order, for this purpose in addition apply a new, previous signal, for example a
, supporting with its conditional irritant of the first order light.
As a result of several combinations of a sound and light the sound irritant also starts to cause salivation. Thus there is new more difficult mediated time communication. It is necessary to underline that a reinforcement for a conditioned reflex of the second order is the conditional irritant of the first order, instead of an unconditional irritant food as if both light and a sound to support with food there will be two separate conditioned reflexes of the first order.
At strong enough conditioned reflex of the second order it is possible to develop a conditioned reflex of the third order. The new irritant, for example, a touch to a
is for this purpose used. In this case the touch is supported only with a conditional irritant of the second order sound, the sound raises the visual centre, and last – the food centre.
There is even more difficult time communication. Reflexes of higher order 4, 5, 6 and etc. are developed only at primacies and the person. Dynamic stereotype Separate conditioned reflexes in a certain situation can communicate among themselves in complexes. If to carry out a number of conditioned reflexes xenical.com strictly certain order with approximately identical time intervals and all this complex
combinations repeatedly to repeat, in xenical.com brain the uniform system having specific sequence
reflex reactions will be generated, i.
earlier isolated reflexes communicate in a uniform complex. Нейроны a brain, possessing the big functional mobility, nevertheless can keep with firmness system of responses to repeating conditional irritations.