“…Although in the past it was rarely studied, it became a respected and major subject for various research programs (Aknin, Dunn, & Norton, 2012;Delle Fave, Brdar, Freire, Vella-Brodrick, & Wissing, 2011;Gilovich, Kumar, & Jampol, 2015;Kashdan, Biswas-Diener, & King, 2008;Keyes, & Annas, 2009;Lyubomirsky, Sheldon, & Schkade, 2005; Pe-anales de psicología, 2016, vol. 32, nº 3 (octubre) terson, Park, & Seligman, 2005;Ryan, Huta, & Deci, 2008;Seligman, & Csikszentmihalyi, 2000;Veenhoven, 2010;Vittersø, & Søholt 2011). A similar trend was also observed in other disciplines, like neuroscience (Berridge, & Kringelbach, 2011) or economy (Frey, & Stutzer, 2002).…”