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 I thought this article was quite interesting to look at from an evolutionary perspective, to me it seemed as if the rumination cycles had a broader effect in this article aside from its link with creativity. The authors also suggest that this type of depression could possibly make an individual more adaptable to the world around them. They discussed this theory in a modern context of someone who suffers from depression after a divorce, learning to better understand social relationships as a result of rumative cycles. However this could apply to a number of contexts in which people who suffered from depression would learn from their mistakes (perceived or real) and as a result develop life skills- which seems as if it would be extremely beneficial in an evolutionary context.