author={Constantine Sedikides and Tim Wildschut and Jamie Arndt and Clay D Routledge},
  journal={Current Directions in Psychological Science},
  pages={304 - 307}
Traditionally, nostalgia has been conceptualized as a medical disease and a psychiatric disorder. Instead, we argue that nostalgia is a predominantly positive, self-relevant, and social emotion serving key psychological functions. Nostalgic narratives reflect more positive than negative affect, feature the self as the protagonist, and are embedded in a social context. Nostalgia is triggered by dysphoric states such as negative mood and loneliness. Finally, nostalgia generates positive affect… 
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