“…Scan lengths longer than 10 min are important as studies have highlighted the negative effects of short scan times on the stability of brain function estimates (Birn et al, 2013; Elliott et al, 2020). There is presently some debate as to whether the ExtA acts mostly as a unified structure, or whether its components represent separate systems underlying different processes, in particular with regard to fear versus anxiety processing or in the tracking of threat imminence (Fox & Shackman, 2019; Goode et al, 2019, 2020; Hur et al, 2020; Tillman et al, 2018; Walker, Miles, & Davis, 2009). Therefore, we utilised this sample to examine the degree of overlap between the ICNs of the CeA and BST; giving an indirect indication as to the similarity of their functions (Gorka et al, 2018; Oler et al, 2012; Tillman et al, 2018; Torrisi et al, 2015, 2019; Weis et al, 2019).…”