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  2. Biology of depression - Wikipedia

    en.wikipedia.org/wiki/Biology_of_depression

    Sleep deprivation and light therapy both target the same brain neurotransmitter system and brain areas as antidepressant drugs, and are now used clinically to treat depression. [28] Light therapy, sleep deprivation and sleep time displacement (sleep phase advance therapy) are being used in combination quickly to interrupt a deep depression in ...

  3. Sickness behavior - Wikipedia

    en.wikipedia.org/wiki/Sickness_behavior

    Further research showed that the brain can also learn to control the various components of sickness behavior independently of immune activation. [ citation needed ] In 2015, Shakhar and Shakhar [ 13 ] suggested instead that sickness behavior developed primarily because it protected the kin of infected animals from transmissible diseases.

  4. Major depressive disorder - Wikipedia

    en.wikipedia.org/wiki/Major_depressive_disorder

    This article needs to be updated. The reason given is: Many outdated sources and information (older than five years). Please help update this article to reflect recent events or newly available information. (July 2024) Medical condition Major depressive disorder Other names Clinical depression, major depression, unipolar depression, unipolar disorder, recurrent depression Sorrowing Old Man (At ...

  5. Major depressive episode - Wikipedia

    en.wikipedia.org/wiki/Major_depressive_episode

    About 20% of these episodes can last two years or more, while about half end spontaneously. However, even after the major depressive episode is over 20% to 30% of patients have residual symptoms, which can be distressing and associated with disability. [5] Fifty percent of people will have another major depressive episode after the first. [3]

  6. Evolutionary approaches to depression - Wikipedia

    en.wikipedia.org/wiki/Evolutionary_approaches_to...

    One reason depression is thought to be a pathology is that it causes so much psychic pain and distress. However, physical pain is also very distressful, yet it has an evolved function: to inform the organism that it is being damaged, to motivate it to withdraw from the source of damage, and to learn to avoid such damage-causing circumstances in the future.

  7. Depression (mood) - Wikipedia

    en.wikipedia.org/wiki/Depression_(mood)

    Depression can have multiple, sometimes overlapping, origins. Depression can be a symptom of some mood disorders, some of which are also commonly called depression, such as major depressive disorder, bipolar disorder and dysthymia. [7] Additionally, depression can be a normal temporary reaction to life events, such as the loss of a loved one.