Minini L, Wattam-Bell J, 2006, "Grasping 3-D and 2-D targets: No effect of target dimensionality on manual prehension" Perception 35 ECVP Abstract Supplement
Grasping 3-D and 2-D targets: No effect of target dimensionality on manual prehension
L Minini, J Wattam-Bell
Evidence suggests that visually guided prehension is mediated by dedicated visuomotor mechanisms in the dorsal visual system (Goodale and Milner, 1992 Trends in Neurosciences 15 20 - 25). A question of interest is whether this system only mediates action aimed at 3-D objects, or whether it does not fundamentally distinguish between 3-D and 2-D targets. Westwood et al (2002 Experimental Brain Research 144 262 - 267) reported that a patient with visual-form agnosia could adjust her grip aperture according to the size of 2-D targets, suggesting that dorsal visual processing mediated this response. In agreement with this claim, Kwok and Braddick (2003 Neuropsychologia 41 932 - 940) found no illusion effects on grasping to either 3-D or 2-D targets. However, both groups reported significantly smaller grip apertures for grasps to 2-D stimuli that still remain largely unaccounted for. In this study, we measured grasps to 3-D, 2-D, and 2-D-enhanced versions of the Diagonal illusion. No effects of target dimensionality were observed on maximum grip aperture and maximum wrist velocity. Moreover, equivalent illusion effects were found in all conditions. Taken together, these results suggest that all stimuli engaged similar visuomotor mechanisms and that grasping 2-D targets is likely mediated by dorsal visual processing.
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