“…Some studies reported processing facilitation and enhanced brain activity in response to positive but not to negative words, once the level of arousal had been matched (Citron, Gray, Critchley, Weekes, & Ferstl, 2014;Herbert et al, 2009;Kuchinke et al, 2005;Recio, Conrad, Hansen, & Jacobs, 2014). In contrast, other studies reported no difference between positive and negative words (Citron et al, 2014a;Kousta et al, 2009;Larsen et al, 2006), unless a block design was used (Algom, Chajut, & Lev, 2004;Nasrallah, Carmel, & Lavie, 2009). (i) Emotional arousal describes the excitation potential of a stimulus, independently of whether it is positive or negative (Barrett & Russell, 1998).…”