Main postulates and communicative role
According to the informational theory proposed by P.V. Simonov, any emotion is a product of the brain's reflection of two crucial variables: the organism's most pressing need at a given moment and the probability that this need will be successfully satisfied.
In addition to the internal reflection of state, emotions carry a vital interpersonal informational meaning. Their primary function is to ensure communication and interaction between living creatures, which is especially important for intraspecific communication (for example, in coordinating actions within a flock or herd).
The external expression of emotional tension includes three main components:
- Autonomic reactions (changes in internal organ function).
- Facial expressions (the most characteristic and easily readable signs, such as snarling in animals).
- Behavioral manifestations (postures, gestures, active actions).
This signaling system is of colossal importance: it allows the intentions of an opponent to be recognized without error. Expressed aggression or, conversely, friendliness is read even during interspecific contact—for example, in the interaction between a child and a dog.
Connection between emotions and speech activity
Subjective emotional sensations historically and physiologically lie at the very basis of human speech activity. The evolutionary development of communication took place in stages: from primitive emotional experiences to emitted sounds, which then transformed into articulate words and full-fledged speech.
Even today, basic emotional communication retains its universality. Active articulation and expressive gestures allow people to effectively exchange basic information and understand each other even in the complete absence of knowledge of the interlocutor's language.
Objectification of emotions: the self-stimulation method
For a long time, it was considered difficult to prove the presence of subjective experiences in animals. This problem was solved by the self-stimulation method, the essence of which is as follows: electrodes are implanted into specific areas of the animal's brain, and it is given the opportunity to independently close the circuit. As a result, animals begin to persistently strive for repeated electrical stimulation of their own brain.
This reaction possesses immense driving force. Trained animals strive to reach the self-stimulation lever, overcoming even severe damaging factors (for example, electric shocks or hot bars on the way to the goal). Such behavior serves as indisputable proof that the stimulation is extremely pleasant for the animal and objectively confirms the presence of subjective positive sensations in it.
This reaction can be elicited in virtually any species of animal whose nervous system has reached the limbic level of organization.
Anatomical substrate and types of structures
The self-stimulation reaction is distributed unevenly in the brain. There is a clear anatomical gradient of intensity:
- Maximum expression is observed during the stimulation of hypothalamic and limbic structures.
- The intensity of the drive for self-stimulation decreases smoothly toward the cerebral hemispheres.
- When the cerebral cortex itself is irritated, it is practically impossible to elicit a self-stimulation reaction.
All reacting brain zones can be divided into three types:
- Self-stimulation structures — their stimulation causes positive emotions, and is pleasant and motivating in nature. It is noteworthy that in terms of total nervous tissue mass, these zones significantly predominate.
- Avoidance structures — their stimulation produces a pronounced negative reaction. Animals demonstrate a persistent negative attitude not only to the very fact of stimulation, but also to surrounding objects or the experimental environment.
- Emotionally neutral zones — stimulation causes neither the urge to repeat nor active avoidance.
It is important to note that similar mechanisms have been confirmed in humans as well. Data from researcher J. Delgado show that when electrodes are implanted in humans (strictly for therapeutic purposes), patients also exhibited a persistent urge to self-stimulate certain brain structures.
Briefly: answers to topical questions
What anatomical structures are part of the Papez circuit involved in the formation of emotions?
The Papez circuit represents a closed anatomical pathway for the circulation of nerve impulses. The sequence of structures includes:
- Hippocampus (Hippocampus) — the initial structure from which impulses travel further.
- Fornix — through it, impulses travel from the hippocampus.
- Mammillary bodies — receive impulses from the fornix.
- Mammillothalamic tract — originates from the nuclei of the mammillary bodies.
- Anterior thalamic nucleus — receives impulses via the mammillothalamic tract.
- Thalamocortical radiation (or thalamo-conical fibers) — fibers extending from the anterior nucleus of the thalamus.
- Cingulate gyrus (Gyrus cinguli) — receives fibers of the thalamocortical radiation.
- Cingulum — conducts impulses from the cingulate gyrus back to the hippocampus, closing the circuit.
The essence of the theory can be remembered through two words: "Want" (need) and "Can" (probability). Emotion is the result of a clash between what the organism needs and how realistic it is to obtain it right now.
Class and exam questions
Emotions act as a means of intraspecific and interspecies communication. Through facial expressions, autonomic responses, and behavior, they allow intentions (such as aggression or friendliness) to be quickly recognized without the use of words.
Emotions serve as a vital means of communication. Through external manifestations—such as facial expressions (e.g., baring teeth), autonomic shifts, and behavior—they allow for the instant recognition of an individual's intentions (aggression or friendliness). This works both within a pack and during interspecies contacts.
What does the self-stimulation method prove?
The method is objective proof of the presence of subjective sensations in animals. The animal's drive to press the lever (even through pain) to stimulate the brain proves the positive nature of the experienced emotion.
Which emotional zones in the brain are anatomically more numerous?
By total mass of nervous tissue, self-stimulation structures (centers causing positive, pleasant emotions) significantly predominate over avoidance structures (zones of negative emotions).
What else to study on this topic
- Autonomic components of emotional reactions
- Physiology of the limbic system and hypothalamus
- Mechanisms of speech activity formation
- J. Delgado's experiments on electrical stimulation of the human brain
- Neurophysiology of avoidance reactions
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