Prism adaptation can improve contralesional tactile perception in neglect

Maravita, Angelo; McNeil, Jeffrey A.; Malhotra, Paresh; Greenwood, Richard; Husain, Masud; Driver, Jon

doi:10.1212/wnl.60.11.1829

Cited by 130 publications

(69 citation statements)

References 9 publications

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“…For VSA and OLP, on the other hand, patients' performances are not easily reproducible from one pre-test to the next. Even though SN is primordially considered as a visually manifested pathology, the reliability of the above-mentioned proprioceptive measurement can be linked to somesthetic manifestations of the syndrome [22][23][24]. It can likewise be linked to the leftward somesthetic effects also observed after PA in healthy subjects [65,66].…”

Section: Discussionmentioning

confidence: 99%

“…Its effects involve a wide range of perceptual, cognitive and motor functions that are affected in SN (see reviews: [15][16][17][18]): visual neglect [19][20][21], somatosensory [22] and haptic [23] neglect, tactile extinction [24], auditory extinction [25], representational neglect [26,27], numerical representations [28] and writing [29] or wheelchair movement [30,31]. Beneficial effects on postural imbalance have likewise been observed in patients following clinical SN remission [32].…”

Section: Introductionmentioning

confidence: 99%

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Long-term sensorimotor and therapeutical effects of a mild regime of prism adaptation in spatial neglect. A double-blind RCT essay

Rode

Lacour

Jacquin-Courtois

et al. 2015

Annals of Physical and Rehabilitation Medicine

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Spatial neglect (SN) is commonly associated with poor functional outcome. Adaptation to a rightward optical deviation of vision has been shown to benefit to SN rehabilitation. The neurophysiological foundations and the optimal modalities of prism adaptation (PA) therapy however remain to be validated. This study is aimed at exploring the long-term sensory-motor, cognitive and functional effects produced by weekly PA sessions over a period of four weeks. A double-blind, monocentric randomized and controlled trial (RCT) was carried out. Twenty patients with left SN secondary to stroke were included, 10 in the "prism" group and 10 in the "control" group. The sensory-motor effects of PA were evaluated by measurement of manual and visual straight-ahead, and also by precision of pointing without visual feedback before and after each PA session. The functional independence measure (FIM) was evaluated before and at 1, 3 and 6 months after PA, while SN severity was assessed using the Behavioural Inattention Test (BIT) before and 6 months after PA. Before the intervention, only manual straight-ahead pointing constituted a reproducible sensory-motor measurement. During prism exposure, a questionnaire showed that not a single patient were aware of the direct effects of optical deviation on pointing movement performance. The sensory-motor after-effects produced by the PA produced a more rapid reduction of the rightward manual straight-ahead, which was secondarily followed by visual straight-ahead. These sensory-motor effects helped to clarify the action mechanisms of PA on SN. At the conclusion of the 6-month follow-up, the two groups showed similar improvement, indicating that a weekly PA session over 4 weeks was not sufficient to produce long-term functional benefit. This improvement was correlated with the evolution of visual straight-ahead, which can be proposed as a marker for patients outcome.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-term sensorimotor and therapeutical effects of a mild regime of prism adaptation in spatial neglect. A double-blind RCT essay

Rode

Lacour

Jacquin-Courtois

et al. 2015

Annals of Physical and Rehabilitation Medicine

View full text Add to dashboard Cite

show abstract

“…Without fixed anatomical landmark, the term is used to designate the gathering of IPL and STG (e. g. Corbetta and Shulman 2011) or the part of IPL next to the junction with the temporal lobe (i. e. without STG; e. g. Karnath et al 2009, Karnath andRorden 2012). on wheel-chair navigation (Jacquin-Courtois et al, 2008), postural control (Nijboer et al, 2014), mental imagery (Rode et al, 2001, haptic spatial judgments (McIntosh et al, 2002), accuracy and response times in pre-attentive visual search (Saevarsson et al, 2009), tactile attention (Maravita et al, 2003), and auditory extinction (Jacquin-Courtois et al, 2010) as well as activities much closer to daily living, such as picture scanning, telephone dialing, and coin and card sorting (Frassinetti et al, 2002). Visuo-constructive disorders and spatial dysgraphia have also been improved by rightward PA , as was temporal order judgment .…”

Section: Unilateral Neglect: Alleviation Of the Spatial Attentional Dmentioning

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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“…Rossetti et al [1] used prism adaptation to rehabilitate neglect patients who present with a neurological condition in which they fail to attend to and represent the left side of space. Since that early work numerous studies have demonstrated the benefit of adaptation to 10 • rightward optical deviations on various neglect symptoms [e.g., [2][3][4] see [5] for a review]. In healthy subjects a mirror effect has been shown in simulating neglect-like symptoms.…”

Section: Introductionmentioning

confidence: 99%