“…These results are consistent with studies using isolated face stimuli, finding that individuals with autism spend significantly less time fixated on the eyes (Dalton et al, 2005;Pelphrey et al, 2002). However, stimulus characteristics play a central role in fixation patterns, with differences between fixations towards drawings, photographs, isolated faces and movie clips (van der Geest, Kemner, Camfferman, Verbaten, & van Engeland., 2002a;Speer, Cook, McMahon, & Clark, 2007) such that reducing ecological validity impacts upon results (see Smilek, Birmingham, Cameron, Bischof, & Kingstone, 2006 in relation to 'cognitive ethology' when discussing the issue of ecological validity in eye-tracking research). In the current paper the term ecological validity refers to how well the stimuli mirror realistic social information.…”