“…Later influential reviews (e.g., McCullough, Kilpatrick, Emmons, & Larson, 2001;McCullough, Kimeldorf, & Cohen, 2008) were themselves influenced by this existing evidence base. But there is now a robust body of research to support new theorizing that recognizes the value of a qualitatively different type of relationship-that based on communal (not exchange) norms (Algoe, 2012;Algoe, Dwyer, Younge, & Oveis, 2019;Algoe, Haidt, & Gable, 2008). The shift in understanding of what triggers gratitude (Algoe et al, 2008) also shifts understanding of its potential social functions: understanding gratitude as a detection and response system for promoting high-quality relationships with people who have demonstrated care for one's welfare has led to predictions about a wide variety of social behavioral outcomes beyond reciprocity among adults (e.g., Bartlett, Condon, Cruz, Baumann, & Desteno, 2012;Jia, Lee, & Tong, 2015;Jia, Tong, & Lee, 2014).…”