Prism Adaptation and Spatial Attention: A Study of Visual Search in Normals and Patients with Unilateral Neglect

Morris, Adam P.; Kritikos, Ada; Berberovic, Nadja; Pisella, Laure; Chambers, Christopher D.; Mattingley, Jason B.

doi:10.1016/s0010-9452(08)70166-7

Cited by 81 publications

(60 citation statements)

References 54 publications

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“…It must also be emphasized that other authors did not find effectiveness on spatial attention tasks, 5 and that poor generalization has been reported when PA used an upper-limb reaching task compared with a walking task. 9 This later result suggests that PA be performed using more global tasks to draw clearer conclusions about its efficacy in SN patients.…”

Section: Discussionmentioning

confidence: 86%

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Ineffectiveness of Prism Adaptation on Spatial Neglect Signs

Rousseaux

Bernati

Saj̈

et al. 2006

Stroke

100

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Background and Purpose-To evaluate the effect of prism adaptation (PA) on spatial neglect signs. Methods-Ten patients (hemianopia in 6) and 8 control subjects were included. Tasks were reading single words, nonwords, and a text, bell cancellation, line bisection, and scene drawing, before and after adaptation, with either deviating or neutral prisms. Results-Errors were more frequent in patients but without any specific effect of PA. We found partial improvement at the late sessions, independent of prisms. Conclusions-We did not confirm the efficacy of PA on spatial neglect. (Stroke. 2006;37:542-543.)

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Section: Discussionmentioning

confidence: 86%

“…3 However, the efficacy of PA has been discussed recently. 4,5 We re-evaluated the efficacy of PA on reading and other clinical tests by comparing the effect of deviating and neutral prisms in the same patients.…”

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confidence: 99%

Ineffectiveness of Prism Adaptation on Spatial Neglect Signs

Rousseaux

Bernati

Saj̈

et al. 2006

Stroke

100

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“…Rossetti et al (1998) first demonstrated that left neglect could be reduced if patients were given a short period of perceptuo-motor training when wearing prismatic lenses that shift their left visual field 108 towards the right. This beneficial effect has subsequently been replicated by other groups (Farnè, Rossetti, Toniolo, & Làdavas, 2002;Frassinetti, Angeli, Meneghello, Avanzi, & Làdavas, 2002;McIntosh, Rossetti, & Milner, 2002), though not in all patients (Frassinetti et al, 2002) or in all tests (Ferber et al, 2003;Morris et al, 2004). Positive effects of adaptation have been reported not only in perceptual-motor tasks such as cancellation and line bisection, but also in tasks requiring that patients locate a city on an imagined map and even in standing balance (Tilikete et al, 2001).…”

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confidence: 89%

“…The paper was positioned in landscape form, centred on MP's midline, and he was asked to make a mark with a pencil where he thought the centre of each line was. This provided us with a measure of line bisection and also of omissions (since he sometimes failed to attempt some lines, and these were completely neglected), enabling us to replicate any effects on omissions found in star cancellation (see also Morris et al, 2004, for a similar procedure). In the test of mathematical cognition, MP was given 2 sheets of A4 paper, each with 6 Â 2 number addition sums (24 þ 37 ¼ ?)…”

Section: Design and Proceduresmentioning

confidence: 99%

Long-term effects of prism adaptation in chronic visual neglect: A single case study

Humphreys

Watelet

Riddoch

2006

Cognitive Neuropsychology

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We investigated the effects of long-term training using prism adaptation on a patient with chronic neglect. A positive effect of prism adaptation was apparent on tests of visuo-spatial processing (cancellation, bisection, and grasping), but there was no benefit for neglect on the detection of errors on the contralesional side of words or on the detection the left side of chimeric faces. Across training sessions, the benefit of adaptation on immediate performance decreased, but it increased across sessions and within sessions when performance was tested up to 90 minutes after adaptation. The beneficial effect was maintained up to 1 year posttraining. In later sessions there were also increased negative after-effects following prism adaptation, as training progressed. There was no improvement on tests of mathematical cognition, which comprised an independent deficit in this patient. The data suggest that prolonged prism training can induce long-term adaptive spatial realignment of visuo-motor mappings, ameliorating some aspects of neglect. We discuss the implications for the rehabilitation of neglect and for understanding the neglect syndrome more generally.

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“…Rossetti and colleagues 10 found no improvement in patients treated with neutral goggles, whereas Rosseaux and colleagues 16 found comparable improvements after treatment with both prismatic and neutral goggles. These criticisms, together with other reports showing no improvement after PA for some tasks, [17][18][19][20] or for some patients, [13][14][15] cast doubt on the specific efficacy of PA above control conditions. However, the fact that some neglect improvement can be obtained also after NP cannot be taken as an argument against the specific effectiveness of PA. During NP, patients perform a series of movements toward a visual target presented several times in the neglected hemifield.…”

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confidence: 89%

Effectiveness of Prism Adaptation in Neglect Rehabilitation

Serino¹,

Barbiani²,

Rinaldesi³

et al. 2009

Stroke

148

122

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Background and Purpose-This study was conducted to investigate the effectiveness on neglect recovery of a 2-week treatment based on prism adaptation (PA) in comparison to an analogous visuomotor training performed without prisms, ie, neutral pointing (NP). Methods-Twenty neglect patients were divided into 2 matched groups, one was submitted to PA (PA group) and the other to NP (NP group) for 10 daily sessions over a period of 2 weeks. After the end of NP treatment, the patients in the NP group were also submitted to PA treatment. Neglect was assessed before and after each treatment and 1 month after the end of the PA treatment. Results-Visuospatial abilities improved after both PA and NP treatment; however, the improvement was significantly higher in the patients in the PA group than in the patients in the NP group. Moreover, when the patients in the NP group were submitted to PA, they further improved up to the level reached by patients in the PA group, ie, to nonpathological scores. Long-lasting beneficial effects of PA were confirmed 1 month from the end of treatment. Conclusion-The

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Prism Adaptation and Spatial Attention: A Study of Visual Search in Normals and Patients with Unilateral Neglect

Cited by 81 publications

References 54 publications

Ineffectiveness of Prism Adaptation on Spatial Neglect Signs

Ineffectiveness of Prism Adaptation on Spatial Neglect Signs

Long-term effects of prism adaptation in chronic visual neglect: A single case study

Effectiveness of Prism Adaptation in Neglect Rehabilitation

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