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The Effects of Chronic Right Hemispheric Damage on the Allocation of Spatial Attention: Alterations of Accuracy and Reliability

Published online by Cambridge University Press:  15 June 2015

Glen R. Finney ,
John B. Williamson ,
D. Brandon Burtis ,
John B. Williamson ,
D. Brandon Burtis ,
Valeria Drago ,
Tomoyuki Mizuno ,
Yong Jeong ,
Gregory P. Crucian  and
Salsabil Haque
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Glen R. Finney*
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
John B. Williamson
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
D. Brandon Burtis
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
John B. Williamson
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
D. Brandon Burtis
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
Valeria Drago
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA Department of Neurology, Oasi Institute for research on Mental Retardation and Brain Aging (IRCCS), Troina (EN), Italy
Tomoyuki Mizuno
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
Yong Jeong
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
Gregory P. Crucian
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
Salsabil Haque
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
Kenneth M. Heilman
Affiliation:
Department of Neurology and Center for Neuropsychological Studies, Department of Veteran Affairs Medical Center, University of Florida College of Medicine, and Neurology Service. Gainesville, Florida, USA
*
Correspondence and reprint requests to: Glen R. Finney, University of Florida, McKnight Brain Institute, P.O. Box 100236, Gainesville, FL 32610-0236, USA. E-mail: finney@neurology.ufl.edu
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Abstract

Right hemispheric damage (RHD) caused by strokes often induce attentional disorders such as hemispatial neglect. Most patients with neglect over time have a reduction in their ipsilesional spatial attentional bias. Despite this improvement in spatial bias, many patients remain disabled. The cause of this chronic disability is not fully known, but even in the absence of a directional spatial attentional bias, patients with RHD may have an impaired ability to accurately and precisely allocate their spatial attention. This inaccuracy and variable directional allocation of spatial attention may be revealed by repeated performance on a spatial attentional task, such as line bisection (LBT). Participants with strokes of their right versus left (LHD) hemisphere along with healthy controls (HC) performed 24 consecutive trials of 24 cm horizontal line bisections. A vector analysis of the magnitude and direction of deviations from midline, as well as their standard deviations (SD), were calculated. The results demonstrated no significant difference between the LHD, RHD and HC groups in overall spatial bias (mean bisection including magnitude and direction); however, the RHD group had a significantly larger variability of their spatial errors (SD), and made larger errors (from midline) than did the LHD and HC groups. There was a curvilinear relationship between the RHD participants’ performance variability and their severity of their inaccuracy. Therefore, when compared to HC and LHD, the RHD subjects’ performance on the LBT is more variable and inaccurate. (JINS, 2015, 21, 373–377)

Keywords

StrokeNeglectInattentionLine bisectionVariabilityImpersistence
Type
Research Articles
Information
Journal of the International Neuropsychological Society , Volume 21 , Issue 5 , May 2015 , pp. 373 - 377
Copyright
Copyright © The International Neuropsychological Society 2015 

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