The Role of Vision in Spatial Representation

Chokron, Sylvie; Colliot, Pascale; Bartolomeo, Paolo

doi:10.1016/s0010-9452(08)70123-0

Cited by 65 publications

(40 citation statements)

References 41 publications

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“…In drawing common objects from memory, blindfolding decreases left omissions , presumably because it nullifies the attention-capturing power of the right-sided details just drawn by the patient. Also the lesser frequency and severity of neglect in imaginal, as opposed to perceptual, tasks (Halsband et al, 1985;Bartolomeo et al, 1994;Manoach et al, 1996;Bartolomeo et al, 2005) suggests that right-sided imagined details have less "magnetic" power than their physical counterparts in visuo-spatial tests (Bartolomeo et al, 1994;Bartolomeo and Chokron, 2002a;Chokron et al, 2004). More relevant to line bisection, Chokron and her co-workers (1998) asked normal participants and neglect patients to stop a dot travelling on a line when it crossed its centre.…”

Section: Relation To Attentional Impairments In Neglectmentioning

confidence: 99%

Line bisection in left neglect: The importance of starting right

Urbanski

2008

Cortex

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Section: Relation To Attentional Impairments In Neglectmentioning

confidence: 99%

Line bisection in left neglect: The importance of starting right

Urbanski

2008

Cortex

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“…[1][2][3] Representational neglect is commonly assessed by requiring subjects to draw objects from memory 4 or to name the towns or the countries on an imagined map. 5,6 For example, when subjects with hemispatial neglect are asked to evoke mentally the map of France, they may omit to mention the towns located on the left part of the map, 6,7 thus suggesting an amputation of the left part of their mental representation of space.…”

mentioning

confidence: 99%

“…When patients with neglect were asked to perform a drawing from memory task, 4,[16][17][18] with or without blindfolding, left neglect was decreased and even eliminated by blindfolding. These results suggest that visual feedback may exacerbate representational neglect and support the hypothesis that engaging attention through visual input can influence the processing of visual imagery.…”

mentioning

confidence: 99%

Looking while imagining

Rode

Revol²,

Rossetti³

et al. 2007

Neurology

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Abstract-Background: Subjects with hemispatial neglect often exhibit representational neglect: a failure to report details from the left side of mentally visualized images. This failure could reflect impaired ability to generate the left side of the mental image, or it could reflect failure to explore the left side of a normally generated mental image. When subjects with hemispatial neglect look at pictures or drawings, their attention tends to be drawn to objects on the right side, thereby aggravating their failure to explore the left side. If representational neglect represents a failure to explore the left side of a normally generated mental visual image, then it should be improved by blindfolding, which removes the attention-catching right-sided stimuli. However, if representational neglect represents a failure to generate the left side of the mental visual image, then blindfolding should have little impact on reporting of details of the image. Methods: To determine which of these explanations is correct, we asked eight normal participants and eight brain-damaged patients with left representational neglect to imagine the map of France and to name as many towns as possible in 2 minutes. In different sessions, participants performed the task with eyes open or while blindfolded. Results: Normal participants mentioned more towns while blindfolded than with vision, thus suggesting a distracting effect of visual details on mental imagery. Patients with neglect, however, showed no appreciable effect of blindfolding on reporting of details from either side of mental images. Conclusion: Representational neglect may represent a failure to generate the left side of mental images.

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“…First, clear vision is affected by walking speed, unsteady gait and declined postural control [9], which all deteriorate following stroke [9,19,60]. Second, older patient with and without stroke are highly dependent on the clarity of the visual information for their overall postural control [9,35] and overall locomotion [33] so that blurred vision during dynamic tasks can significantly jeopardize their stability [61]. However, DVA has never been assessed as a safety outcome following gait training rehabilitation to address visual changes along with the changes in walking abilities.…”

Section: Discussionmentioning

confidence: 99%

“…Visual functions: Intact visual functions are required and are significantly involved in spatial orientation especially during dynamic tasks such as walking [35,36]. Furthermore, vision problems has been recently addressed among the commonly reported disabilities for people over 65 [37] and moreover in chronic diseases such as stroke [38] and has a negative influence on the QOL [38].…”

Section: Factors Related To Mobility-related Fallsmentioning

confidence: 99%

Chronic Ambulatory Stroke Survivors: Is It Safe to Walk Faster?

Ahmad¹

2017

Int J Neurorehabilitation Eng

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Various interventions have been proposed that target improving mobility and walking speed of stroke survivors. A typical course of physical therapy that targets increasing walking speed does not guarantee that a person is "safe" in terms of their mobility. The literature can point to no conclusions regarding the walking performance benchmarks that would be necessary in order to maximize safety and how to assess them in an integrated approach. As 40% of all stroke survivors suffer serious falls within a year after their stroke, clinicians should be cautious when treating stroke patient to increase their walking speed and that there is a need for assessment batteries that comprehensively assess threats to mobility safety in chronic ambulatory stroke survivors. This review is details the available research on factors related to mobility falls in chronic ambulatory stroke survivors. This research also propose future research using Dynamic Visual Acuity (DVA) as an assessment methodology will combine three factors that are related to mobilityrelated fall risk, i.e., vision, fast walking and dual-task walking.

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The Role of Vision in Spatial Representation

Cited by 65 publications

References 41 publications

Line bisection in left neglect: The importance of starting right

Line bisection in left neglect: The importance of starting right

Looking while imagining

Chronic Ambulatory Stroke Survivors: Is It Safe to Walk Faster?

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