To measure indicators of positive and negative affect the software matched the number of words against an internal dictionary relating to positive and negative affect. We then converted the word counts (number of matches) indicating social connectedness and affect into percentages to account for varying narrative lengths. We used independent samples t-tests to test the effect of nostalgia condition on these indicators of social connectedness and affect. As predicted, those in the nostalgia condition mentioned social connectedness more often those in the neutral condition (Mnostalgia= 3.04, SD = 2.04 vs. = 1.49, 2.04; = 3.74, < .01). Nostalgia participants also Mneutral SD = t(102) p mentioned positive affect more often than did neutral participants (Mnostalgia= 5.07, = 3.14 SD vs. = 1.74, 1.70; = 6.09, < .01). The two groups did not differ on Mneutral SD = t(102) p negative affect (t < 1, NS). We transformed the violin, rooster, and car Duration Listening to Aversive Sounds. crash time scores using a natural log transformation (Laran and Janiszewski 2009) to normalize the distribution of the scores. Given that the time scores varied across the different types of sounds (i.e. the car crash scores were 20% shorter than the other clips), we standardized the transformed scores to create a duration index ( = .83). As expected, an independent samples t-test with nostalgia condition predicting duration revealed that participants in the nostalgia condition, compared to those in the neutral condition, indicated that they would listen to the aversive sounds for a shorter time (Mnostalgia = -.12, = .81 vs. = .20, .91; = SD Mneutral SD = t(102) 1.89, = .06). p Mediation Analysis: Social Connectedness (Loved, Protected)
To measure indicators of positive and negative affect the software matched the number of words against an internal dictionary relating to positive and negative affect. We then converted the word counts (number of matches) indicating social connectedness and affect into percentages to account for varying narrative lengths. We used independent samples t-tests to test the effect of nostalgia condition on these indicators of social connectedness and affect. As predicted, those in the nostalgia condition mentioned social connectedness more often those in the neutral condition (Mnostalgia= 3.04, SD = 2.04 vs. Mneutral = 1.49, SD = 2.04; t(102) = 3.74, p < .01). Nostalgia participants also mentioned positive affect more often than did neutral participants (Mnostalgia= 5.07, SD = 3.14 vs. Mneutral = 1.74, SD = 1.70; t(102) = 6.09, p < .01). The two groups did not differ on negative affect (t < 1, NS). Duration Listening to Aversive Sounds. We transformed the violin, rooster, and car crash time scores using a natural log transformation (Laran and Janiszewski 2009) to normalize the distribution of the scores. Given that the time scores varied across the different types of sounds (i.e. the car crash scores were 20% shorter than the other clips), we standardized the transformed scores to create a duration index ( = .83). As expected, an independent samples t-test with nostalgia condition predicting duration revealed that participants in the nostalgia condition, compared to those in the neutral condition, indicated that they would listen to the aversive sounds for a shorter time (Mnostalgia = -.12, SD = .81 vs. Mneutral = .20, SD = .91; t(102) = 1.89, p = .06). Mediation Analysis: Social Connectedness (Loved, Protected)
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