[Reverse temporary connections and their role in human cortical reactions].
A number of experiments shows that the character of human cortical response to a conditioned stimulus is to a considerable degree determined by properties and significance of the second stimulus in the combined pair. In a combination of two stimuli differently expressed depression of cortical response to the first stimulus takes place. If the "reinforcing" stimulus is emotionally significant and is recognized then the changes of evoked cortical activity in response to conditioned stimulus are complex and of different signs; they result from simultaneous action on cortical structures of both inhibitory and activating "nonspecific" influences. In this case the facilitation of the cortical response is revealed by comparison with the tests of indifferent stimulus before pairing or with tests where association between two indifferent stimuli is formed. A considerable increase of evoked response after elimination of the "reinforcing" emotional stimulus testifies that this facilitation is merely relative, and along with activating influence via feedback has an inhibitory action on cortical structures which perceive the conditioned stimulus.
D000328:Adult; D001244:Association; D002540:Cerebral Cortex / Q000502:physiology*; D003214:Conditioning, Classical / Q000502:physiology*; D004644:Emotions / Q000502:physiology*; D005074:Evoked Potentials, Visual; D006801:Humans; D008032:Limbic System / Q000502:physiology; D008568:Memory / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D012054:Reinforcement, Psychology; D013067:Speech Perception / Q000502:physiology
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