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Emotion is, in everyday speech, a person's state of feeling in the sense of an affect. Scientific discourse has drifted to other meanings and there is no consensus on a definition. Emotion is often intertwined with mood, temperament, personality, disposition, and motivation. On some theories, cognition is an important aspect of emotion. Those acting primarily on emotion may seem as if they are not thinking, but mental processes are still essential, particularly in the interpretation of events. For example, the realization of danger and subsequent arousal of the nervous system (e.g. rapid heartbeat and breathing, sweating, muscle tension) is integral to the experience of fear. Other theories, however, claim that emotion is separate from and can precede cognition. Emotions are complex. According to some theories, they are a state of feeling that results in physical and psychological changes that influence our behavior. The physiology of emotion is closely linked to arousal of the nervous system with various states and strengths of arousal relating, apparently, to particular emotions. Emotion is also linked to behavioral tendency. Extroverted people are more likely to be social and express their emotions, while introverted people are more likely to be more socially withdrawn and conceal their emotions. Emotion is often the driving force behind motivation, positive or negative.〔Gaulin, Steven J. C. and Donald H. McBurney. Evolutionary Psychology. Prentice Hall. 2003. ISBN 978-0-13-111529-3, Chapter 6, p 121-142.〕 An alternative definition of emotion is a "positive or negative experience that is associated with a particular pattern of physiological activity." According to other theories, emotions are not causal forces but simply syndromes of components, which might include motivation, feeling, behavior, and physiological changes, but no one of these components is the emotion. Nor is the emotion an entity that causes these components〔Barrett, L.F. and Russell, J.A. The psychological construction of emotion. Guilford Press. 2015. ISBN 978-1462516971.〕 Emotions involve different components, such as subjective experience, cognitive processes, expressive behavior, psychophysiological changes, and instrumental behavior. At one time, academics attempted to identify the emotion with one of the components: William James with a subjective experience, behaviorists with instrumental behavior, psychophysiologists with physiological changes, and so on. More recently, emotion is said to consist of all the components. The different components of emotion are categorized somewhat differently depending on the academic discipline. In psychology and philosophy, emotion typically includes a subjective, conscious experience characterized primarily by psychophysiological expressions, biological reactions, and mental states. A similar multicomponential description of emotion is found in sociology. For example, Peggy Thoits described emotions as involving physiological components, cultural or emotional labels (e.g., anger, surprise etc.), expressive body actions, and the appraisal of situations and contexts. Research on emotion has increased significantly over the past two decades with many fields contributing including psychology, neuroscience, endocrinology, medicine, history, sociology, and even computer science. The numerous theories that attempt to explain the origin, neurobiology, experience, and function of emotions have only fostered more intense research on this topic. Current areas of research in the concept of emotion include the development of materials that stimulate and elicit emotion. In addition PET scans and fMRI scans help study the affective processes in the brain.〔Cacioppo, J.T & Gardner, W.L (1999). Emotion. "Annual Review of Psychology", 191.〕 It also is influenced by hormones and neurotransmitters such as dopamine, noradrenaline, serotonin, oxytocin, cortisol and GABA. ==Etymology, definitions, and differentiation== The word "emotion" dates back to 1579, when it was adapted from the French word ''émouvoir'', which means "to stir up". The term emotion was introduced into academic discussion to replace passion.〔Dixon, Thomas. From passions to emotions: the creation of a secular psychological category. Cambridge University Press. 2003. ISBN 978-0521026697.〕 According to one dictionary, the earliest precursors of the word likely dates back to the very origins of language. The modern word emotion is heterogeneous In some uses of the word, emotions are intense feelings that are directed at someone or something.〔Hume, D. Emotions and Moods. Organizational Behavior, 258-297.〕 On the other hand, emotion can be used to refer to states that are mild (as in annoyed or content) and to states that are not directed at anything (as in anxiety and depression). One line of research thus looks at the meaning of the word emotion in everyday language〔 and this usage is rather different from that in academic discourse. Another line of research asks about languages other than English, and one interesting finding is that many languages have a similar but not identical term〔Wierzbicka, Anna. Emotions across languages and cultures: diversity and universals. Cambridge University Press. 1999.〕 Emotions have been described by some theorists as discrete and consistent responses to internal or external events which have a particular significance for the organism. Emotions are brief in duration and consist of a coordinated set of responses, which may include verbal, physiological, behavioural, and neural mechanisms. Psychotherapist Michael C. Graham describes all emotions as existing on a continuum of intensity. Thus fear might range from mild concern to terror or shame might range from simple embarrassment to toxic shame. Emotions have also been described as biologically given and a result of evolution because they provided good solutions to ancient and recurring problems that faced our ancestors. Moods are feelings that tend to be less intense than emotions and that often lack a contextual stimulus.〔 Emotion can be differentiated from a number of similar constructs within the field of affective neuroscience: * Feelings are best understood as a subjective representation of emotions, private to the individual experiencing them. * Moods are diffuse affective states that generally last for much longer durations than emotions and are also usually less intense than emotions. * Affect is an encompassing term, used to describe the topics of emotion, feelings, and moods together, even though it is commonly used interchangeably with emotion. In addition, relationships exist between emotions, such as having positive or negative influences, with direct opposites existing. These concepts are described in contrasting and categorization of emotions. Graham differentiates emotions as functional or dysfunctional and argues all functional emotions have benefits. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Emotion」の詳細全文を読む スポンサード リンク
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