The ventral vs dorsal dichotomy originates from some differences in object processing correlating with the lesion and functional activation studies, e.g. prosopagnosia with right  temporobasal lesion / activation focus and pure alexia in the homologue regions in the left. Positional tasks and spatial tasks comprising tasks with respect to the own body are correlated to dorsal lesions / activations. From a clinical / lesional pov, already the cerebral akinetopsia (lesion at the lateral temporooccipital junction) raise some concern. In my opinion, connections from primary brain areas in a modality to other modalities should be more accounted for, and of course there must be a connection between dorsal and ventral pathways, which makes this dichotomy a good similar kick-off to test hypothesis' against as it was the case in language localisation.

Interesting.  Let me find that NIH lecture video and post a link.  The whole question of localization seems under study.  Look forward to learning more.