The greyscales task: a perceptual measure of attentional bias following unilateral hemispheric damage

Mattingley, Jason B.; Berberovic, Nadja; Corben, Louise A.; Slavin, Melissa J.; Nicholls, Michael E. R.; Bradshaw, John L.

doi:10.1016/j.neuropsychologia.2003.07.007

Cited by 101 publications

(75 citation statements)

References 34 publications

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“…Reports of hemineglect in patients with right cerebral injuries are very frequent [16][17][18] , although reports of hemineglect after left injuries can also be found 15,32 . A possible explanation to this fi nding would be the fact that individuals with dysphasia were included in the group of patients with left injuries.…”

Section: Discussionmentioning

confidence: 99%

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Estudo comparativo entre a relação do hemisfério acometido no acidente vascular encefálico e a evolução funcional em indivíduos destros

Voos¹,

Valle²

2008

Rev. bras. fisioter.

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Section: Discussionmentioning

confidence: 99%

“…Patients with such injuries, initially demonstrate body image defi cits, neglect of the extracorporeal space opposite to the side of the injury 15,16 and visuomotor defi cits 17,18 . Initially, there is greater weight-bearing on the non-aff ected side of the body and postural alignment is aff ected 19 .…”

Section: Introductionmentioning

confidence: 99%

Estudo comparativo entre a relação do hemisfério acometido no acidente vascular encefálico e a evolução funcional em indivíduos destros

Voos¹,

Valle²

2008

Rev. bras. fisioter.

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“…Perceptual asymmetries have been examined extensively using the greyscales task (Mattingley et al, 2004;Nicholls et al, 1999;Okubo & Nicholls, 2006). In the greyscales task, participants are presented with a pair of equiluminant, mirror-reversed rectangles that are bright on one side and dark on the other.…”

Section: Introductionmentioning

confidence: 99%

“…Images are presented parallel to one another and participants are asked to select which image appears darker. Participants tend to select the image that is dark on the left side as being darker overall, despite the images being identical (Mattingley et al, 2004), referred to as pseudoneglect (Bowers & Heilman, 1980;Jewell & McCourt, 2000). When performed by hemispatial neglect patients who have suffered right parietal damage (Brain, 1941;Vallar & Perani, 1986), the greyscales task shows a similar but opposing rightward bias (Mattingley et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Participants tend to select the image that is dark on the left side as being darker overall, despite the images being identical (Mattingley et al, 2004), referred to as pseudoneglect (Bowers & Heilman, 1980;Jewell & McCourt, 2000). When performed by hemispatial neglect patients who have suffered right parietal damage (Brain, 1941;Vallar & Perani, 1986), the greyscales task shows a similar but opposing rightward bias (Mattingley et al, 2004). The greyscales task exhibits a bias similar to that observed on line bisection tasks (Mattingley, Pierson, Bradshaw, Phillips, & Bradshaw, 1993); however the greyscales are a newer task that have demonstrated both large and reliable effects (i.e., Nicholls et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Upper and lower visual field differences in perceptual asymmetries

Elias

2011

Brain Research

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Neurologically normal individuals show a leftward spatial bias and tend to collide with objects on the right side more frequently than on the left. The upper visual field is associated with extrapersonal space, and mediated by the ventral stream through parvocellular projections.The lower visual field is associated with peripersonal space, and mediated by the dorsal stream through magnocellular projections. Upper and lower visual field differences have been observed in perceptual asymmetries but results have been mixed. Object-and space-based coordinates also both influence the leftward bias; however their relative contributions are unknown as similar spatial conditions are often collapsed across. More left-side collisions emerged on a route following task in the lower visual field and more right-side collisions were seen in the upper visual field (Thomas, Stuckel, Gutwin, & Elias, 2009). Left-handers made more right-side collisions in the central condition, whereas right-handers showed no bias. Leftward biases on the greyscales task were stronger in the lower visual field; however no distance-based differences were observed (Thomas & Elias, 2010). A stronger spatial bias was found on the greyscales task, whereas a stronger object-based bias was found on the object luminosity task (Thomas & Elias, in press). When individual spatial conditions were examined, the image chosen most often was always located in the lower field. Stimulus type and spatial location interacted to determine which coordinate type contributes more strongly to leftward biases. We also found that the leftward bias on the greyscales task was stronger in the lower visual field during prolonged presentation and in the upper visual field during brief presentation. A global motion task was created to preferentially engage magnocellular projections to the dorsal stream. Isoluminant red/green and blue/yellow colour tasks, which preferentially engage parvocellular projections to the ventral stream, were also created. Leftward biases were seen on the greyscales and motion tasks. On an isoluminant colour task, biases were significantly weakened, suggesting

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Alertness Training Improves Spatial Bias and Functional Ability in Spatial Neglect

Vleet

Bonato

Fabara³

et al. 2020

Annals of Neurology

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We conducted a multisite, randomized, double-blinded, controlled trial to examine the effectiveness of a digital health intervention targeting the intrinsic regulation of goal-directed alertness in patients with chronic hemispatial neglect. Methods: Forty-nine participants with hemispatial neglect, who demonstrated significant spatially biased attention after acquired brain injury, were randomly assigned to the experimental attention remediation treatment or the active control group. The participants engaged with the remotely administered interventions for 12 weeks. The primary outcome was spatial bias on the Posner cueing task (response time difference: left minus right target trials). Secondary outcomes included functional abilities (measured via the Catherine Bergego scale and Barthel index), spatial cognition, executive function, quality of life, and sleep. Assessments were conducted before and immediately after participation in the experimental intervention or control condition, and again after a 3-month no-contact period. Results: Compared with the active control group, the intervention group exhibited a significant improvement in the primary outcome, a reduction in spatially biased attention on the Posner cueing task (p = 0.010, Cohen's d = 0.96), in addition to significant improvements in functional abilities as measured on the Catherine Bergego and Barthel indices (p = 0.027, Cohen's d = 0.24). Interpretation: Our results demonstrate that our attention training program was effective in improving the debilitating attention deficits common to hemispatial neglect. This benefit generalized to improvements in real-world functional abilities. This safe, highly scalable, and self-administered treatment for hemispatial neglect might serve as a useful addition to the existing standard of care.

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The greyscales task: a perceptual measure of attentional bias following unilateral hemispheric damage

Cited by 101 publications

References 34 publications

Estudo comparativo entre a relação do hemisfério acometido no acidente vascular encefálico e a evolução funcional em indivíduos destros

Estudo comparativo entre a relação do hemisfério acometido no acidente vascular encefálico e a evolução funcional em indivíduos destros

Upper and lower visual field differences in perceptual asymmetries

Alertness Training Improves Spatial Bias and Functional Ability in Spatial Neglect

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