“…Activity in several nodes of the core autobiographical network, such as the medial prefrontal cortex (Burgess et al, 2003;Gilbert et al, 2006) and the posterior parietal cortex (Cabeza et al, 2008;Ciaramelli et al, 2008; see also Nyberg et al, 2010), has been conceptualized as mediating the allocation of attention to internal (vs. external) sources of information, a process inherent to memory retrieval. Directing attention away from perceptual reality towards inner, mentally constructed experience may downregulate the appraisal of immediate rewards, reducing the valuation gap normally present between immediate and future rewards, hence DD (Ballard and Knutson, 2009;Smallwood et al, 2011;Macrae et al, 2017). Consistent with this interpretation, mind-wandering, the drift of attention away from external tasks/events towards internally generated information (e.g., thoughts, memories, plans; Smallwood et al, 2011), which is characterized by reduced cortical analysis of external events (Smallwood et al, 2008;Kam et al, 2011), is also associated with low DD rates (Smallwood et al, 2013).…”