 A different approach begins with a more detailed understanding of underlying neural representations tied to different brain regions. For example, the fusiform face (FFA) area appears to be necessary for normal human face experience in that lesions in FFA lead to prosopagnosia, the inability to see faces even if one can see their parts. FFA is part of a larger network that is important in visual processing of faces (Behrmann &amp; Plaut 2013). Recently, microstimulation of FFA in an awake human epilepsy patient induced visual distortions of actual faces as opposed to other objects (Parvizi et al. 2012). Alterations of visual experience were also reported during microstimulating the parahippocampal place (PPA) area in an awake pre-operative epileptic patient that induced visual hallucinations of scenes (Mégevand et al. 2014). PPA is the same area that showed activation in vegetative state patients when they putatively imagined walking around their home  (section 2.5).