Left to right: Representational biases for numbers and the effect of visuomotor adaptation
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Adaptation to right-shifting prisms improves left neglect for mental number line bisection.This study examined whether adaptation affects the mental number line in normal participants.Thirty-six participants completed a mental number line task before and after adaptation to either: left-shifting prisms, right-shifting prisms or control spectacles that did not shift the visual scene. Participants viewed number triplets (e.g. 16, 36, 55) and determined whether the numerical distance was greater on the left or right side of the inner number. Participants demonstrated a leftward bias (i.e. overestimated the length occupied by numbers located on the left side of the number line) that was consistent with the effect of pseudoneglect. The leftward bias was corrected by a short period of visuomotor adaptation to left-shifting prisms, but remained unaffected by adaptation to right-shifting prisms and control spectacles. The findings demonstrate that a simple visuomotor task alters the representation of space on the mental number line in normal participants.
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Nicholls, M.; Kamer, A.; Loftus, Andrea (2008)While patients with right parietal damage and spatial neglect bisect lines to the right, the general population bisects lines to the left; a phenomenon known as pseudoneglect. The leftward bias also occurs for mental ...
Loftus, Andrea; Vijayakumar, N.; Nicholls, M. (2009)Visuomotor adaptation to left-shifting prisms can affect performance for a variety of tasks in neurologically intact (normal) participants. This study examined whether visuomotor adaptation affects performance on the ...
Chapman, H.; Eramudugolla, R.; Gavrilescu, M.; Strudwick, M.; Loftus, Andrea; Cunnington, R.; Mattingley, J. (2010)Visuomotor adaptation to a shift in visual input produced by prismatic lenses is an example of dynamicsensory-motor plasticity within the brain. Prism adaptation is readily induced in healthy individuals, andis thought ...