Emotional stress under conditioned reflex switching over of heterogeneous instrumental reflexes

Preobrazhenskaya, L.A.

Zhurnal Vysshei Nervnoi Deyatel'nosti Imeni Ivlova. 28(3): 505-513


Accession: 005354689

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The factors leading to pronounced emotional stress accompanied by changes in electrical activity of hippocampus were studied in 4 dogs during elaboration of conditioned switching-over of heterogeneous instrumental reflexes. Objectively recorded signs of emotional stress were observed when the animal was not accurate enough in discerning defensive and alimentary situations and throughout the improvement of instrumental defensive reflex. Pronouncement of hippocampal .theta.-rhythm increased at those stages of switching-over elaboration where the probability of successfully avoiding pain stimulation was relatively low. .theta.-Rhythm is apparently the correlate of the degree of the emotional stress and not only a manifestation of general arousal reaction depending on the level of sensory input.