Evolutionary origin of emotions
The apparatus of emotions evolved as a reliable survival mechanism. It is present in all living creatures with an organized central nervous system. Although these experiences vary qualitatively in animals at different evolutionary levels, in humans they have reached maximum development and extend not only to biological but also to social activity.
According to the first postulate of the theory, emotions act as a marker of metabolic needs:
- Negative emotions. They arise when a need appears (hunger, thirst, fear). Subjectively, they are always unpleasant, which forces the body to quickly recognize the deficit and triggers an active search for ways to eliminate it.
- Positive emotions. They serve as an indicator that the need has been satisfied. This is the so-called sanctioning factor that reinforces success. The body does not need to perform a detailed logical analysis of the situation—the pleasant sensation itself signals the completion of the search. At the same time, the intensity of the positive experience directly depends on how difficult it was to overcome obstacles on the way to the goal.
Evaluative function (third postulate)
Emotions are necessary for the rapid assessment of external stimuli to instantly determine whether they are beneficial or harmful. This speed is especially pronounced when encountering tissue-damaging factors.
A characteristic clinical example is the formation of an antalgic (protective) posture in a knee joint injury. The patient does not waste time on a conscious "mathematical" calculation of the flexion angles at which the load will be minimal. The subjective feeling of pain forcefully compels them to assume the position where the discomfort subsides. Evolutionarily, this particular posture turns out to be the most favorable for subsequent recovery.
Mechanisms of formation within the functional system
The emotional background inextricably accompanies all key stages of a behavioral act according to P.K. Anokhin: from afferent synthesis and decision-making to the formation of the action result acceptor and subsequent efferent synthesis. The sign of the emotion is determined by the ratio of the current dominant need and the actually obtained outcome.
- Positive emotion. Develops if the adaptive result is achieved. It acts as a kind of biological reward and confirms the correctness of the chosen behavioral strategy.
- Negative emotion. Appears when the goal is not achieved, i.e., a mismatch of parameters occurs in the action result acceptor. This state is based on the enhancement of the orienting-exploratory reaction and prompts the subject either to overcome obstacles more stubbornly or to look for entirely new ways to achieve the goal.
- Emotional stress. Arises as an extreme form of reaction when the body is unable for a long time to realize its need and obtain the desired result.
Role of learning and memory
The process of emotion formation is inextricably linked with the subject's previous experience. Based on past attempts to satisfy basic biological or complex social needs, the action result acceptor is formed.
Memory of past successes and failures allows the goal to be given a certain emotional coloring in advance. In other words, emotional reactions are not purely innate automatisms—they largely depend on lifelong learning processes.
Briefly: answers to topical questions
What is the acceptor of action result in the theory of functional systems?
The action result acceptor is an apparatus for predicting and evaluating future results, the formation of which reflects the process of goal-setting and higher motivation.
This apparatus creates an ideal neural model of the intended result. The acceptor is based on the mechanisms of afferent synthesis and decision-making.
Main functions:
- It compares the predicted parameters with the actually obtained ones through reverse afferentation.
- When the result matches the goal, a positive emotion (satisfaction) arises.
- In case of a mismatch, a negative emotion is formed, which activates the orienting-exploratory reaction and restructures the action program.
What sequential stages does a behavioral act consist of according to Anokhin?
A behavioral act consists of four sequential nodal stages:
- Afferent synthesis — the first, initiatory stage of processing dominant motivation, memory, and afferentation.
- Decision-making — successively replaces the previous stage, ensuring the choice of a specific goal and the formation of a dominant line of behavior through lateral inhibition.
- Prediction of the required result (action result acceptor) — the formation of the prediction apparatus and the neural model of the future result.
- Efferent synthesis — the stage of central organization of the executive action, uniting CNS structures. It culminates in the formation of a complex behavioral act.
What other theories of emotions are covered in the normal physiology course?
The normal physiology course covers the following concepts:
- Informational theory of emotions (P.V. Simonov) — states that emotion is the brain's reflection of two factors: the actual need and the probability of its satisfaction.
- Peripheral theory of emotions (James-Lange) — postulates that signals entering the CNS from internal organs and somatic musculature play a decisive role in the formation of emotions. Emotion arises as a consequence of physiological changes rather than being their cause, which is confirmed by the mechanism of reverse afferentation.
Emotion is like a scale: on one pan is the dominant need, on the other is the achieved result. They match — we get a sanctioning positive; they don't match — an orienting-exploratory negative.
Class and exam questions
What is the sanctioning factor of behavior in the context of Anokhin's theory?
This is a positive emotion that quickly confirms goal achievement without complex analysis and serves as a signal for the termination of exploratory behavior.
What is the biological role of negative emotions?
They are subjectively unpleasant and thereby reliably signal the presence of an unsatisfied metabolic need, stimulating the search for ways to satisfy it.
What happens during a mismatch in the action result acceptor?
A negative emotion arises on the basis of the orienting-exploratory reaction. This forces a human or animal to look for new forms of behavior to overcome the encountered obstacles.
Under what condition does emotional stress develop?
Emotional stress is formed in situations where the subject is deprived of the opportunity to achieve the required adaptive result for a long time.
What else to study on this topic
- Nodal stages of the functional system (according to P.K. Anokhin)
- Afferent and efferent synthesis
- Action result acceptor and its formation
- Orienting-exploratory reaction
Master the entire topic in the "Physiology" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on the topic "Biological Theory of Emotions" and 4,128 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 114 video lessons on the subject
Other topics in the "Emotions" section
Free video lessons: PhysiologyShort lessons with study notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.