“…S1 and S2a-f). Our results are consistent with other fMRI studies demonstrating decreased activation/connectivity within frontoparietal attention and executive control networks in amnestic AD-MCI as compared to HC (Neufang et al, 2011;Rombouts et al, 2002;Saykin et al, 2004;Sorg et al, 2007), and in PD-MCI as compared to PD-NC (Amboni et al, 2015;Baggio et al, 2015;Gratwicke et al, 2015), and with cognitive studies demonstrating impaired top-down control of visual attention in PD (Tommasi et al, 2015) and in AD-MCI (Redel et al, 2012). While impaired attention, working memory capacity and executive function in PD-MCI have been mostly linked to fronto-striatal and mesocortical dopamine network deficits (Gratwicke et al, 2015;Cools et al, 2008), dementia in both AD and PD has been related to cholinergic network dysfunction (Ballinger et al, 2016;Bohnen et al, 2015Bohnen et al, , 2003Francis et al, 1999;Hilker et al, 2005;Perez-Lloret and Barrantes, 2016).…”