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

Corben, LA, Mattingley, JB and Bradshaw, JL (2001) A kinematic analysis of distracter interference effects during visually guided action in spatial neglect. Journal of The International Neuropsychological Society, 7 3: 334-343. doi:10.1017/S1355617701733073

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Author Corben, LA
Mattingley, JB
Bradshaw, JL
Title A kinematic analysis of distracter interference effects during visually guided action in spatial neglect
Journal name Journal of The International Neuropsychological Society   Check publisher's open access policy
ISSN 1355-6177
Publication date 2001-01-01
Year available 2001
Sub-type Article (original research)
DOI 10.1017/S1355617701733073
Open Access Status File (Publisher version)
Volume 7
Issue 3
Start page 334
End page 343
Total pages 10
Place of publication Port Chester
Publisher Cambridge Univ Press
Language eng
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 distracters 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 distracter 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 distracters. They often failed to move to left targets in the presence of a right-sided distracter, or else they moved to the distracter itself rather than to a contralesional target. The initial accelerative phase of their movements to contralesional targets tended to be interrupted prematurely, and they spent significantly more time in the terminal guidance phase of movements to contralesional targets in the presence of an ipsilesional distracter. In contrast. contralesional distracters had little effect on patients' movements to ipsilesional targets. We conclude that right hemisphere damage induces a competitive bias that favors actions to ipsilesional targets. This bias affects multiple stages of processing within the visuomotor system, from initial programming through to the final stages of terminal guidance.
Keyword Clinical Neurology
interference effects
right hemisphere
selective attention
spatial neglect
Unilateral Neglect
Directional Hypokinesia
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Brain Institute Publications
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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Created: Wed, 17 Oct 2007, 21:19:40 EST