... Nonetheless, relying on the limited available studies of OCPD and integrating data from related constructs (e.g., executive dysfunction, inflexibility, perfectionism, neuroticism), one can postulate that variability in neural circuits involved in executive function and emotional processing may contribute to OCPD. Most notably, the following regions may be involved in OCPD: (a) the orbitofrontal cortex (OFC), which has been linked to decision making and valuation and may be involved in pathological task perseveration (Bechara et al., 2000;Walton et al., 2011); (b) the dorsal and rostral anterior cingulate cortices (dACC, rACC), which are associated with behavioral control and conflict monitoring (Carter & van Veen, 2007;Shenhav et al., 2016) and cognitive control (Tang et al., 2019), respectively, and may contribute to inflexibility in OCPD; (c) the dorsolateral prefrontal cortex (dlPFC), which contributes to plan formation and potentially perseverative planning (Kaller et al., 2011;Mushiake et al., 2006); (d) right inferior frontal gyrus, which is associated with inhibition of response tendencies (Aron et al., 2014); (e) insula, which has been associated with empathy and adaptive/flexible behavior to environmental stimuli (Singer et al., 2009), that may be involved in scrupulousness and rigidity in OCPD; (f) posterior cingulate cortex and precuneus, which, through their links to self-referential thought and rumination, may contribute to perfectionism and preoccupation with plans in OCPD (Brewer et al., 2013;Cavanna & Trimble, 2006;H. X. Zhou et al., 2020); and (g) striatal regions, including the caudate and ventral striatum, which are involved in executive planning and response switching (Grahn et al., 2008) and motivation (Cardinal et al., 2002), respectively. ...