Hi,
I found this useful.
Research shows that nostalgia is beneficial:
http://www.nytimes.com/2013/07/09/sc...me&ref=general
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Nostalgia has been shown to counteract loneliness, boredom and anxiety. It makes people more generous to strangers and more tolerant of outsiders. Couples feel closer and look happier when they’re sharing nostalgic memories. On cold days, or in cold rooms, people use nostalgia to literally feel warmer.
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but Dr. Sedikides emphasizes that nostalgia is not the same as homesickness. It’s not just for those away from home, and it’s not a sickness, despite its historical reputation.
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“Nostalgic stories often start badly, with some kind of problem, but then they tend to end well, thanks to help from someone close to you,” Dr. Sedikides says. “So you end up with a stronger feeling of belonging and affiliation, and you become more generous toward others.":
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Here is the Southhampton Nostalgia Scale
http://www.southampton.ac.uk/nostalgia/materials/
Mari