Associations between PGNG response inhibition and measures of impulsivity and psychopathic personality traits revealed several interesting findings. The measure of inhibitory ability, PCIT, was inversely predicted by Cognitive Complexity of the BIS-11. Participants who score highly on the Cognitive Complexity subscale of the BIS-11 are characterised by problems to focus on ongoing tasks and by being too impulsive to pursue mentally challenging activities (Patton et al., 1995). It is perhaps not surprising then that as the score on this subscale increases, individuals find the non-alternation rule of the PGNG more challenging. This finding, of increasing EF demands affecting inhibitory functioning in the PGNG for individuals who experience difficulty on challenging tasks, resembles previous findings for a complex Go/No-go task (Reynolds et al., 2006), which was conceptually similar to the PGNG, due to the incorporation of an increased working memory component while performing the inhibitory task.