“…If complete subtraction of optic flow were possible then any remaining retinal motion would be due, unambiguously, to scene-relative movement of other objects in the environment. Evidence for the existence of an optic flow parsing mechanism that performs exactly this kind of global subtraction operation has now been presented by several groups, across many studies, using varied experimental techniques ( Rushton & Warren, 2005 ; Warren & Rushton, 2007 ; Rushton, Bradshaw, & Warren, 2007 ; Warren & Rushton, 2008 ; Warren & Rushton , 2009a ; Warren & Rushton,2009b ; Matsumiya & Ando, 2009 ; MacNeilage, Zhang, DeAngelis, & Angelaki, 2012 ; Warren, Rushton, & Foulkes, 2012 ; Rushton, Foulkes, & Warren, 2013 ; Foulkes, Rushton, & Warren, 2013b ; Fajen & Matthis, 2013 ; Layton & Fajen, 2016 ; Niehorster & Li, 2017 ; Rogers, Rushton, & Warren, 2017 ; Rushton, Niehorster, Warren, & Li, 2018 ; Rushton, Chen, & Li, 2018 ).…”