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PubMed2006

Pavlov at home and abroad: His role in international physiology.

Contemporary science is conducted internationally. This is a comparatively recent phenomenon that developed during the last century, most notably after the second world war. During the first half of the twentieth century, however, I P Pavlov became the first major international physiologist, travelling widely and contributing to major scientific meetings around the world. This paper records and assesses Pavlov's international role, with an especial focus on the International Congresses of Physiology, set in the dynamic context of his domestic position in Imperial Russia and later in the Soviet Union.

Gastrointestinal Tract↗
PubMedDate not supplied

Brain mechanisms of emotions.

At the 23rd International Congress of Physiology Sciences (Tokyo, 1965) the results of experiment led us to the conclusion that emotions were determined by the actual need and estimation of probability (possibility) of its satisfaction. Low probability of need satisfaction leads to negative emotions actively minimized by the subject. Increased probability of satisfaction, as compared to the earlier forecast, generates positive emotions which the subject tries to maximize, that is, to enhance, to prolong, to repeat. We named our concept the Need-Informational Theory of Emotions. According to this theory, motivation, emotion, and estimation of probability have different neuromorphological substrates. Activation through the hypothalamic motivatiogenic structures of the frontal parts of the neocortex orients the behavior to signals with a high probability of their reinforcement. At the same time the hippocampus is necessary for reactions to signals of low probability events, which are typical for the emotionally excited brain. By comparison of motivational excitation with available stimuli or their engrams, the amygdala selects a dominant motivation, destined to be satisfied in the first instance. In the cases of classical conditioning and escape reaction the reinforcement was related to involvement of the negative emotion's hypothalamic neurons, while in the course of avoidance reaction the positive emotion's neurons were involved. The role of the left and right frontal neocortex in the appearance or positive or negative emotions depends on these informational (cognitive) functions.

Animals↗