“…For example, humorous stimuli (e.g., comedy film clips) have been used to elicit emotional states described as "joy" (Britton et al, 2006;Hubert and de Jong-Meyer, 1991;Johnson and Fredrickson, 2005), "mirth" (Goel and Dolan, 2007), "amusement" (Giuliani et al, 2008), "happiness" (Dawkins et al, 2007), and even "exhilaration" (Ruch, 1995). In addition, positive emotion terms such as "joy" and "mirth" have been used somewhat interchangeably (Panksepp, 2000), and combined descriptors such as "happiness/amusement" (Roberts and Levenson, 2006) and "joy/laughter" (Block et al, 1991) are often used.…”