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Depersonalization (or depersonalisation) is an anomaly of self-awareness. It can consist of a reality or detachment within the self, regarding one's mind or body, or being a detached observer of oneself. Subjects feel they have changed, and the world has become vague, dreamlike, less real, or lacking in significance. It can be a disturbing experience. Chronic depersonalization refers to depersonalization/derealization disorder, which is classified by the DSM-5 as a dissociative disorder.〔American Psychiatric Association (2013). ''Diagnostic and Statistical Manual of Mental Disorders DSM-5''. American Psychiatric Association. ISBN 9780890425541.〕 Though degrees of depersonalization and derealization can happen to anyone who is subject to temporary anxiety/stress, chronic depersonalization is more related to individuals who have experienced a severe trauma or prolonged stress/anxiety. Depersonalization-derealization is the single most important symptom in the spectrum of dissociative disorders, including dissociative identity disorder and "dissociative disorder not otherwise specified" (DD-NOS). It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure and can indicate low levels of brain serotonin.〔The Edge Effect, by Eric R. Braverman, M.D., 2004, pp. 142〕 In social psychology, and in particular self-categorization theory, the term ''depersonalization'' has a different meaning and refers to "the stereotypical perception of the self as an example of some defining social category". == Description == Individuals who experience depersonalization feel divorced from their own personal physicality by sensing their body sensations, feelings, emotions and behaviors as not belonging to the same person or identity. Often a person who has experienced depersonalization claims that things seem unreal or hazy. Also, a recognition of a self break down (hence the name). Depersonalization can result in very high anxiety levels, which further increase these perceptions. Individuals with depersonalization often find it hard to remember anything they saw or experienced while in third person. Depersonalization is a subjective experience of unreality in one's sense of self, while derealization is unreality of the outside world. Although most authors currently regard depersonalization (self) and derealization (surroundings) as independent constructs, many do not want to separate derealization from depersonalization. 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「Depersonalization」の詳細全文を読む スポンサード リンク
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