Akinetopsia in posterior cortical variant of Alzheimer's

Akinetopsia is inability to perceive motion (Zeki, Brain 1991). It occurs due to bilateral lesions at posterior parieto-occipital junction. (Also see Rizzo, Brain Res., 2008). Authors (Tsai and Mendez, Neurology 2009) report 2 patients with degenerative disease that reported double vision with vision as "a series of successive stills" from moving images. Neuropsych testing showed impaired constructions of figures (Rey-Ost.), impaired figure-ground, visual synthesis, search, depth discrimination Akinetopsia was elicited with vision to LEFT and not relieved with alternate eye cover/uncover. Laterality and preference for one lateralization corresponds with primate work.