sentence: Lewy-related pathology in posterior brain regions increases the risk of dementia in PD ( Toledo et al ., 2016 ) , loss of connectivity in the DMN correlates with cognitive performance in Parkinson ’ s disease ( Tessitore et al ., 2012 ; Karunanayaka et al ., 2016 ) and reduced DMN functional connectivity is seen in lateral temporal nodes as well as posterior brain regions in patients with PD-MCI ( Hou et al ., 2016 ) .