Reasons for Variability in the Reported Rate of Occurrence of Unilateral Spatial Neglect After Stroke

Bowen, Audrey; McKenna, Kate; Tallis, Raymond

doi:10.1161/01.str.30.6.1196

Cited by 362 publications

(254 citation statements)

References 61 publications

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“…Those results are in agreement with data obtained by a metaanalysis 19 in which the hemineglect frequency varied from 13 to 82% after right hemisphere lesions.…”

Section: Discussionsupporting

confidence: 92%

Screening tests are not enough to detect hemineglect

Lopes

Ferreira

Carvalho

et al. 2007

Arq. Neuro-Psiquiatr.

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-Objective: To verify the sensitivity of the conventional subtests of the Behavioral Inattention Test (BIT) in the diagnosis of hemineglect after stroke. Method: One hundred and two patients with cerebral infarct or hemorrhage were prospectively evaluated. In 22, hemineglect was diagnosed using standard BIT criteria. The frequency of hemineglect using 6 commonly used screening subtests of this battery was assessed. Results: Hemineglect would not be recognized in 10 patients if they were only screened using the line crossing test; this would be the case in 2 patients with the letter cancellation test; and in 4 patient with the line bisection test. Three patients would not be diagnosed even if both line crossing and line bisection tests were used. Conclusion: Hemineglect may not be recognized with single screening tests commonly used. The use of a standard battery is recommended to improve diagnostic sensitivity in individuals with various subtypes of hemineglect.KEY WORDS: perceptual disorders, hemispatial neglect , stroke, diagnosis. Testes de triagem não são suficientes para diagnosticar heminegligência RESUMO -Objetivo: Verificar a sensibilidade dos subtestes convencionais da Behavioral Inattention Test (BIT) no diagnóstico da heminegligência após o acidente vascular cerebral (AVC). Método:Foram avaliados prospectivamente 102 pacientes com AVC. Em 22 casos heminegligência foi diagnosticada através do BIT. A freqüência de diagnóstico correto utilizando os 6 subtestes específicos desta bateria foi analisada. Resultados: 10 pacientes não seriam diagnosticados como heminegligentes se fossem avaliados apenas com o "line crossing", 2 se o teste de triagem escolhido fosse o "letter cancellation", e 4 se utilizássemos apenas o "line bisection". Além disso, 3 pacientes não teriam recebido o diagnóstico correto mesmo utilizando dois testes usuais de triagem -"line crossing" e "line bisection". Conclusão: O uso de testes isolados de triagem pode falhar em diagnosticar heminegligência após o AVC. O uso de uma bateria formal de avaliação é necessá-rio para identificar indivíduos com diferentes tipos de heminegligência. PALAVRAS-CHAVE: transtornos da percepção, heminegligência, acidente cerebrovascular, diagnóstico.

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“…Those results are in agreement with data obtained by a metaanalysis 19 in which the hemineglect frequency varied from 13 to 82% after right hemisphere lesions.…”

Section: Discussionsupporting

confidence: 92%

Screening tests are not enough to detect hemineglect

Lopes

Ferreira

Carvalho

et al. 2007

Arq. Neuro-Psiquiatr.

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“…Even for visual-spatial neglect, the reported rate of occurrence after stroke varies from 12% to 100% (see Bowen, McKenna et al, 1999). With particular reference to the present study, a number of factors may affect estimated incidence rates of neglect in number space.…”

mentioning

confidence: 65%

Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task

Loetscher

Nicholls

Towse

et al. 2010

Cortex

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Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task Loetscher, T; Nicholls, M E; Towse, J N; Bradshaw, J L; Brugger, P Loetscher, T; Nicholls, M E; Towse, J N; Bradshaw, J L; Brugger, P (2010). AbstractSpatial neglect can be characterized by a "magnetic attraction" towards the right side of a visual stimulus array and a selection of stimuli from that hemispace. This study examined whether these distinctive characteristics in visuo-motor space are also evident in representational number space. Given that numbers are thought to be represented along a leftto-right oriented mental number line, an affinity for the spontaneous selection of larger numbers was anticipated for neglect patients. Contrary to this expectation, neglect patients (n=20) picked a similar range of numbers compared to controls (n=17) when generating a number between 1,000 and 10,000 and when playing an imaginary lottery game. There was, however, a positive correlation between the biases for the imaginary lottery, number generation and a number bisection task -demonstrating that exploration asymmetries along the mental number line are consistent within individuals across tasks. Some of the patients selected smaller numbers in all of these tasks, confirming reports of dissociations between physical and numerical-representational forms of neglect. Conversely, only four (20%) of the patients could reliably be classified as demonstrating a neglect in number space. When filling out a physical lottery ticket, the neglect patients showed the expected bias towards picking numbers placed on the right-hand side of the ticket. These results demonstrate that the magnetic attraction towards the right side of mental representations is rather weak and that representational forms of neglect only occasionally co-exist with neglect in physical space.

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“…The results of these studies and one meta-analysis (Bowen, McKenna, & Tallis, 1999) are summarized in Table 3. It is important to note the wide range in time frames of testing, tasks, scoring, and criteria for neglect determination across reported studies.…”

Section: Discussionmentioning

confidence: 99%

Right hemispatial neglect: Frequency and characterization following acute left hemisphere stroke

Kleinman

Newhart

Davis

et al. 2007

Brain and Cognition

137

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The frequency of various types of unilateral spatial neglect and associated areas of neural dysfunction after left hemisphere stroke are not well characterized. Unilateral spatial neglect (USN) in distinct spatial reference frames have been identified after acute right, but not left hemisphere stroke. We studied 47 consecutive right handed patients within 48 hours of left hemisphere stroke to determine the frequency and distribution of types of right USN using cognitive testing and MRI imaging. The distribution of USN types was different from the previously reported distribution following acute right hemisphere stroke. In this left hemisphere stroke population, allocentric neglect was more frequent than egocentric neglect.

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Reasons for Variability in the Reported Rate of Occurrence of Unilateral Spatial Neglect After Stroke

Cited by 362 publications

References 61 publications

Screening tests are not enough to detect hemineglect

Screening tests are not enough to detect hemineglect

Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task

Right hemispatial neglect: Frequency and characterization following acute left hemisphere stroke

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