“…Previous studies have shown that AD patients were associated with abnormal gait speed during walking (Buracchio, Dodge, Howieson, Wasserman, & Kaye, ; Verghese, Wang, Lipton, Holtzer, & Xue, ), impaired olfactory processing (Devanand et al ., ; Mesholam, Moberg, Mahr, & Doty, ; Murphy, Gilmore, Seery, Salmon, & Lasker, ), auditory deficits (Gallacher et al ., ; Lin et al ., ), and the loss of visual perceptual functions (Cronin‐Golomb, Corkin, & Growdon, ; Rizzo & Nawrot, ; Tetewsky & Duffy, ). In the vision domain, perceptual impairments have so far been reported in the form of colour discrimination (Pache et al ., ; Wijk, Berg, Sivik, & Steen, ), letter/word discrimination (Velarde, Perelstein, Ressmann, & Duffy, ), contrast sensitivity (Cronin‐Golomb et al ., ), and in particular, visual motion sensitivity (Gilmore et al ., ; Kavcic et al ., ; Mapstone et al ., ). Several of these perceptual dysfunctions are predictive of progression towards AD (Cronin‐Golomb et al ., ; Devanand et al ., , ), thus holding potential promise for non‐invasive early detection of AD and/or the tracking of disease development.…”