Variation in bittersweet nostalgic feelings and their divergent effects on daily well-being.

Experimental manipulations of nostalgia that privilege positive aspects of the bittersweet emotion have led to the conclusion that nostalgia is a predominantly positive emotion, yet nostalgia covaries negatively with well-being in daily life. To reconcile this discrepancy, we developed and tested the bittersweet variation model of nostalgia that posits that (a) nostalgic feelings vary not only in intensity but also in valence (i.e., how bitter or sweet a nostalgic feeling is); (b) daily events influence the valence of nostalgic feelings; and (c) nostalgia's valence influences well-being. Across two daily diary studies (