 Substantial motivation for Milner and Goodale’s division draws on lesion studies in humans. Lesions to the dorsal stream do not seem to affect conscious vision in that subjects are able to provide accurate reports of what they see (but see Wu 2014a). Rather, dorsal lesions can affect visual-guidance of action with optic ataxia being a common result. Optic ataxic subjects perform inaccurate motor actions. For example, they grope for objects, yet they can accurately report the object’s features (for reviews, see Andersen et al. 2014; Pisella et al. 2009; Rossetti, Pisella, &amp; Vighetto 2003). Lesions in the ventral stream disrupt normal conscious vision, yielding visual agnosia, an inability to see visual form or to visually categorize objects (Farah 2004).