Using the model of shortly delayed defensive conditioned reflexes in cats it is shown that nonreinforced preexposure of conditioned stimulus leads to a definite manifestation of electrographic correlates of the memory trace, i. e. of the conditioned evoked potential in examined brain structures, as well as of conditioned neurographic response and conditioned skin-galvanic reaction. The reproduction of the conditioned evoked potentials was completely blocked in the cortex and zona incerta. The conditioned neurographic response was blocked too. The probability of skin-galvanic reaction appearance was harshly decreased.
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