“…Gratitude interventions often take the form of compiling a list of things to be grateful for in a journal (gratitude journals/lists; Wood et al, 2010), brief grateful contemplation (Watkins, Woodward, Stone, & Kolts, 2003), or writing letters of gratitude (Seligman, Steen, Park, & Peterson, 2005). Others, notably when contrasting gratitude with another positive psychology intervention (e.g., writing about best possible selves), have found little evidence that gratitude interventions were superior (Kerr, O'Donovan, & Pepping, 2015;Manthey, Vehreschild, & Renner, 2016), begging the question of whether gratitude interventions are distinct from other positive psychology interventions (Dickens, 2017). Some gratitude interventions or PPIs with a gratitude component have demonstrated improvements in psychological well-being (e.g., increases in positive affect, reductions in depression; Seligman et al, 2005;Watkins, Uhder, & Pichinevskiy, 2014;Wood et al, 2010) and, more recently, in improved biological functioning (e.g., blood pressure) in healthy populations (Jackowska, Brown, Ronaldson, & Steptoe, 2016).…”