Study on the Progress of Neural Mechanism of Positive Emotions

Abstract Positive emotions refer to emotions accompanied by pleasant feelings, such as happiness, interest, satisfaction, pride, and love, which are generated by individuals in response to internal and external stimuli and events. Positive emotions are conscious processes that involve a variety of components, such as a pleasant experience, facial/body expressions, evaluations, and especially behavioural plans and activation states. People's cognitive process is often accompanied by emotions, and the influence of positive emotions on cognitive activities has gradually become the focus of research in recent years. This study constructs a regulation model and an assessment model of positive emotions, and analyses the neural mechanisms of the effects of dopamine substances on human positive emotions.


Introduction
found that language is a reflection of the mind, and the mind is a function of the brain. Many of them have moved from the study of language to the study of mind and cognition. " Language is the mirror of the soul, " Chomsky said.
"Language is a fundamental function of the human mind, " said sale. After the mid-1970s, the object of philosophy naturally turned to the human mind itself. According to sale, "the most important development in cognitive science is the shift of cognitive scientists from computational models of cognitive science to models of cognitive neuroscience. This shows that the brain as the basis of cognition has replaced the digital computer as the basis of cognition. We see the neurobiological brain as the basis of human cognition, and this is a very important shift. He added: "the most promising area of research is cognitive neuroscience, not just brain micro nanotechnology.
Cognition is the process and activity in which the brain and nervous system produce the minds. Generally speaking, animals with brain and nervous system have a certain degree of mind. Cognitive science is a science that takes cognitive process and rules as research object, and cognition involves learning, memory, thinking, understanding, and other behaviours that occur in the cognitive process [1] . The structure of the previously internationally recognized discipline of cognitive science is shown in Figure 1.
During the development of cognitive science, 6 new development directions are produced within the original 6 supporting disciplines, including mental philosophy, cognitive psychology, cognitive linguistics (or language and cognition), cognitive anthropology (or referred to as culture, evolution and cognition), artificial intelligence, and cognitive neuroscience.

STUDY ON THE PROGRESS OF NEURAL MECHANISM OF POSITIVE EMOTIONS
has benefited from the development of brain science, which in turn has benefited from the great progress of brain imaging technology.
Computer tomography (CT), magnetic resonance imaging (MRl), functional magnetic resonance imaging (fMRl) and positron emission tomography (PET) are widely used in the research of brain and neuroscience, which promotes the development of brain and neuroscience [2] . These developments in brain science have prepared conditions for us to reveal the secrets of the mind.

Positive emotions
The "positive" in positive emotions is derived in contrast with "negative" in negative emotions. According to Russell's circumplex model (i.e., the two-dimensional theory of emotions), emotions are considered to contain two dimensions, valence and arousal. The valence dimension is divided into pleasantnessunpleasantness, and the arousal degree is divided into high-low (as shown in Figure 2) [3] .
According to this model, people preliminarily define the positive emotion and the negative emotion.

The expansion of positive emotions
Positive emotions such as happiness, interest, satisfaction and so on can extent the individual's instantaneous thinking activity sequence, and can build individual resources, including physical resources such as physical skills, health, intellectual resources knowledge, psychological theory, executive control, interpersonal resources and friendship, social support networks, and psychological resources, such as psychological resilience, optimism, creativity [5] . Figure 3 graphically illustrates the process of "the expansion and utility of positive emotions, " which is a spiraling process. cognitive change and response modulation [7] , which act on different emotion generation stages, as shown in Figure 4 [6] .

Evaluation model of positive emotions
The world, perception, assessment, and action [8] .
Through the comparison of the assessment system with the previous process model of emotion regulation, it is not difficult to find that there is a one-to-one relationship between them: situation-world, attention-perception, appraisal-assessment and response -action.
The most important part of the assessment system is its dynamics. First, the behaviour produced by each appraisal cycle is targeted

Positive emotional experience
Extending the behavioral sequence of immediate thinking Building lasting personal development resources Change people's thinking and behavior patterns and achieve spiral at one or more aspects of the "world" in the appraisal cycle. When the "world" part of the cycle changes, the perception of the "world" cycle by the subsequent appraisal cycle will change, resulting in a change in the subsequent appraisal and action (see Figure 5) [9] . The cycle of the appraisal system stops only when the difference between the individual's target state and the changed world is below a certain threshold.

Dopamine properties
Dopamine is a neurotransmitter that helps In theory, the addition of this substance can make people excited, but it can be addictive, too. Dopamine appears in the forebrain and basal ganglia, of which the latter responsible for dealing with fear. However, because of dopamine, the feeling of fear is replaced, thus there are many people who are addicted to dopamine [10] . Similarly, the role of positive emotions in the human body is also directly related to dopamine, whose structural model is shown in Figure 6.