 Since the groundbreaking work of Leslie Ungerleider and Mortimer Mishkin (1982), scientists divide primate cortical vision into two streams: dorsal and ventral (for further dissection, see Kravitz et al. 2011). The dorsal stream projects into the parietal lobe while the ventral stream projects into the temporal lobe (see  Figure 1).  Controversy surrounds the functions of the streams. Ungerleider and Mishkin originally argued that the streams were functionally divided in terms of what and where: the ventral stream for categorical perception and the dorsal stream for spatial perception. David Milner and Melvyn Goodale (1995) have argued that the dorsal stream is for action and the ventral stream for “perception”, namely for guiding thought, memory and complex action planning (see Goodale &amp; Milner 2004 for an engaging overview). There continues to be debate surrounding the Milner and Goodale account (Schenk and McIntosh 2010) but it has strongly influenced philosophers of mind.