Visuospatial asymmetry and non-spatial attention in subacute stroke patients with and without neglect

Kessel, Marlies E. van; Nes, Ilse J. W. van; Brouwer, Wiebo; Geurts, A.C.H.; Fasotti, Luciano

doi:10.1016/j.cortex.2009.06.004

Cited by 47 publications

(59 citation statements)

References 45 publications

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“…Despite intact performance at paper-and-pencil tests for neglect assessment, the better dual-task performance obtained by the drivers group was interpreted as though these patients were more efficient in dealing with complex visuospatial tasks requiring intact divided attention skills. A simple yet challenging driving environment, where lateral items had to be detected, was reproduced in an experimental study where more patients were classified as affected by neglect according to reaction time asymmetry in the “driving” task than the BIT criteria (van Kessel et al, 2010). Within the RBD group, patients with both RT asymmetries and pathological BIT scores showed longer ipsilesional RTs than patients with RT asymmetries only.…”

Section: Computer-based Testing and Increased Task Demands Results In mentioning

confidence: 99%

“…– The true impairment suffered by patients is revealed, in the chronic phase, only when attentional resources, otherwise implemented to contrast and compensate for the contralesional bias, cannot be effectively allocated (e.g., Bartolomeo, 1997, 2000; Marzi et al, 2002; Deouell et al, 2005; Rengachary et al, 2009; Bonato et al, 2010, 2012a; van Kessel et al, 2010; Hasegawa et al, 2011). …”

Section: Final Considerationsmentioning

confidence: 99%

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Neglect and Extinction Depend Greatly on Task Demands: A Review

Bonato

2012

Front. Hum. Neurosci.

125

124

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This review illustrates how, after unilateral brain damage, the presence and severity of spatial awareness deficits for the contralesional hemispace depend greatly on the quantity of attentional resources available for performance. After a brief description of neglect and extinction, different frameworks accounting for spatial and non-spatial attentional processes will be outlined. The central part of the review describes how the performance of brain-damaged patients is negatively affected by increased task demands, which can result in the emergence of severe awareness deficits for contralesional space even in patients who perform normally on paper-and-pencil tests. Throughout the review neglect is described as a spatial syndrome that can be exacerbated in the presence and severity by both spatial and non-spatial tasks. The take-home message is that the presence and degree of contralesional neglect and extinction can be dramatically overlooked based on standard clinical (paper-and-pencil) testing, where patients can easily compensate for their deficits. Only tasks where compensation is made impossible represent an appropriate approach to detect these disabling contralesional deficits of awareness when they become subtle in post-acute stroke phases.

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Section: Computer-based Testing and Increased Task Demands Results In mentioning

confidence: 99%

Section: Final Considerationsmentioning

confidence: 99%

Neglect and Extinction Depend Greatly on Task Demands: A Review

Bonato

2012

Front. Hum. Neurosci.

125

124

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“…In patients with right hemispheric lesions and neglect (but without visual field defects) target detection tends to be less accurate and slower within the left than right visual field (e. g. (Butler et al, 2004;Crottaz-Herbette et al, Submitted;Deouell et al, 2005;Eramudugolla et al, 2010;van Kessel et al, 2010). A brief session of rightward PA was shown to improve performance within the left space in easy (Crottaz-Herbette et al, Submitted) and in demanding tasks.…”

Section: Target Detection: Rightward Prismatic Adaptation Induces a Smentioning

confidence: 99%

Modulation of visual attention by prismatic adaptation

Clarke

Crottaz-Herbette

2016

Neuropsychologia

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Visuo-motor adaptation via rightward-deviating prisms has been repeatedly shown to alleviate lateralized deficits in neglect, including detection of targets as well as endogenous and exogenous orienting of attention. We review here evidence relevant to the underlying neural mechanisms. Rightward prismatic adaptation was shown to shift visual field representation from right to left inferior parietal lobule, changing thus hemispheric dominance within the ventral attentional system. This change is likely to redirect visual input to the dorsal attentional system and to re-install balance between its left- and right-hemispheric components in neglect. We propose a model based on the shift in hemispheric dominance within the ventral attentional system (SHD-VAS), which offers a parsimonious explanation for the effect of rightward prismatic adaptation on spatial bias in neglect and on behavioral data in normal subjects.

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“…Indeed, a wide range of studies of neglect have described the presence of a lateralized bias in orienting (as outlined above), as well as an asymmetry of the omissions toward the contralesional side Halligan, Cockburn, & Wilson, 1991;Halligan, Marshall, & Wade, 1989;Samuelsson, Hjelmquist, Naver, & Blomstrand, 1995; van Kessel, van Nes, Brouwer, Geurts, & Fasotti, 2010). In a recent review Karnath and Rorden (2012) concluded that these symptoms of spatial bias in orienting and omissions are so fundamental in the clinical setting that they can be defined as core symptoms of spatial neglect (see also Schenk & Karnath, 2012).…”

mentioning

confidence: 99%

Ipsilesional Bias and Processing Speed are Important Predictors of Functional Dependency in the Neglect Phenomenon After a Right Hemisphere Stroke

Viken

Jood

Jern

et al. 2014

The Clinical Neuropsychologist

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Visuospatial neglect (VSN) predicts unfavorable functional outcome in stroke patients. This study examined the relative importance of different core symptoms of VSN as predictors of functional dependency. A consecutive series of 105 right hemisphere stroke patients were tested early after stroke on three basic symptoms of VSN (omissions, asymmetry of omissions and ipsilesional bias of attention) and on two symptoms related to VSN (processing speed and repetitive target detections in visual search). Neurological deficits were also assessed. Functional outcome was measured 3 months and 2 years after stroke with the modified Rankin Scale. Univariate analyses revealed significant relationships with functional outcome for both core and related symptoms of VSN and for neurological deficits. Area under the curve statistics and stepwise logistic regressions showed that the most important predictors assessed early after stroke were presence of ipsilesional bias for dependency at 3 months and visual processing speed for dependency at 2 years after stroke. These results show that valuable prognostic information regarding dependency after right hemisphere stroke can be obtained by assessing fundamental sub-components of VSN early after stroke. The development of standardized clinical methods for investigation of sub-components, such as a right capture of attention and processing speed, is essential.

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Visuospatial asymmetry and non-spatial attention in subacute stroke patients with and without neglect

Cited by 47 publications

References 45 publications

Neglect and Extinction Depend Greatly on Task Demands: A Review

Neglect and Extinction Depend Greatly on Task Demands: A Review

Modulation of visual attention by prismatic adaptation

Ipsilesional Bias and Processing Speed are Important Predictors of Functional Dependency in the Neglect Phenomenon After a Right Hemisphere Stroke

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