A kinematic analysis of distractor interference effects during visually guided action in spatial neglect

Journal of the International Neuropsychological Society : JINS
L A CorbenJ L Bradshaw

Abstract

Patients with left spatial neglect following right hemisphere damage may show anomalies in ipsilesional-limb movements directed to targets on their affected side, in addition to their characteristic perceptual deficits. In this study we examined the extent to which visually guided movements made by neglect patients are susceptible to interference from concurrent visual distractors on the contralesional or ipsilesional side of a designated target. Eleven right hemisphere patients with visual neglect, plus 11 matched healthy controls, performed a double-step movement task upon a digitizing tablet, using their ipsilesional hand to respond. On each double-step trial the first component of the movement was cued to a common central target, whereas the second component was cued unpredictably to a target on either the contralesional or ipsilesional side. On separate trials lateral targets either appeared alone or together with a concurrent distractor in an homologous location in the opposite hemispace. In addition to being significantly slower and more error prone than controls, neglect patients also exhibited a number of interference effects from ipsilesional distractors. They often failed to move to left targets in the presence of a ...Continue Reading

Citations

Apr 20, 2004·Neuropsychologia·R D McIntoshA D Milner
Mar 14, 2013·Scandinavian Journal of Psychology·Winand H DittrichUdo Kischka
Jul 26, 2016·Frontiers in Human Neuroscience·Davide NardoEmiliano Macaluso

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