“…As noted within the circumplex view of emotion (e.g., Posner, Russell, & Peterson, 2005;Russell, 2003), although emotional states such as those of being elated or upset can be characterised as possessing opposite valences, they can also be characterised as possessing comparable arousal levels. As stated earlier, despite some evidence against the hypothesis that arousal mediates the effects of positive and negative affect in cognition (Isen et al, 1987;Olivers & Nieuwenhuis, 2006), the results of a number of studies have provided support for this hypothesis (Anderson, 2005;Keil & Ihssen, 2004;Robinson et al, 2004;Schimmack, 2005). In the present paradigm, the results of Experiment 2 show that the effect of valence on perceptual flexibility could have been mediated by arousal at most only partially, not wholly, because positive and negative primes were matched on arousal, but nevertheless differed in their promotion of cognitive flexibility.…”