What role for prism adaptation in the rehabilitation of pure neglect dyslexia?

Ptak, Radek

doi:10.1080/13554794.2017.1361452

Cited by 4 publications

(3 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the VR environment, longer lines required eye-movements to be perceived entirely, which may have interfered with or even canceled the adaptation effects by recalibrating the coordinates of the sensory-motor reference frame. We also found no transfer effects in the landmark task, which is in good agreement with previous reports suggesting that PA may affect visuomotor performance more than purely perceptual measure ( Harvey et al, 1995 ; Gammeri et al, 2020 ; but see Ptak, 2017 ; McIntosh et al, 2019 ).…”

Section: Discussionsupporting

confidence: 92%

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

et al. 2021

Self Cite

View full text Add to dashboard Cite

Visuo-motor adaptation with optical prisms that displace the visual scene (prism adaptation, PA) has been widely used to study visuo-motor plasticity in healthy individuals and to decrease the lateralized bias of brain-damaged patients suffering from spatial neglect. Several factors may influence PA aftereffects, such as the degree of optical deviation (generally measured in dioptres of wedge prisms) or the direction of the prismatic shift (leftward vs. rightward). However, the mechanisms through which aftereffects of adaptation in healthy individuals and in neglect affect performance in tasks probing spatial cognition remain controversial. For example, some studies have reported positive effects of PA on auditory neglect, while other studies failed to obtain any changes of performance even in the visual modality. We here tested a new adaptation method in virtual reality to evaluate how sensory parameters influence PA aftereffects. Visual vs. auditory-verbal feedback of optical deviations were contrasted to assess whether rightward deviations influence manual and perceptual judgments in healthy individuals. Our results revealed that altered visual, but not altered auditory-verbal feedback induces aftereffects following adaptation to virtual prisms after 30-degrees of deviation. These findings refine current models of the mechanisms underlying the cognitive effects of virtual PA in emphasizing the importance of visual vs. auditory-verbal feedback during the adaptation phase on visuospatial judgments. Our study also specifies parameters which influence virtual PA and its aftereffect, such as the sensory modality used for the feedback.

show abstract

Section: Discussionsupporting

confidence: 92%

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, at closer look several factors emerge that may systematically contribute to thè outcome of PA rehabilitation. First, PA may affect visuomotor performance more than purely perceptual measures (Ptak, 2017;Striemer & Danckert, 201 Ob). For example, PA was found to improve performance in thè classic line bisection task, but not in thè landmark task (Harvey, Milner, & Roberts, 1995), which requires judging thè accuracy of line pre-bisections (Striemer & Danckert,201 Oa).…”

Section: Introductionmentioning

confidence: 99%

Adaptation to virtual prisms and its relevance for neglect rehabilitation: a single-blind dose-response study with healthy participants

Gammeri

Turri

Ricci

et al. 2018

Neuropsychological Rehabilitation

Self Cite

View full text Add to dashboard Cite

Prism adaptation (PA) has been applied with mixed success as a rehabilitation method of spatial neglect. Results from many single-case and multiple case studies as well as randomised controlled trials do not produce a clear picture of the efficacy of PA. We here tested a new method of PA, by inducing adaptation effects in the virtual reality. Healthy participants were attributed to one of four groups: no deviation, 10-, 20-, or 30-degrees rightward deviation. In contrast to classical wedge prisms, we induced the visual shift progressively. Participants performed two variants of the bisection and the landmark task to measure cognitive transfer of adaptation effects. Pointing error was directly related to the degree of optical deviation, and was greatest immediately following adaptation. Transfer was only observed in the bisection tasks, and only in the 30-degrees group. Due to the gradual induction of the spatial deviation the majority of participants were unaware of the adaptation effects. These findings show that large rightward deviation may affect sensorimotor performance in healthy participants similarly to neglect patients. Moreover, the finding that only participants adapted to 30-degrees showed biased bisection performance suggests that a critical threshold must be reached in order to induce significant visuomotor transfer.

show abstract

“…Significant improvement of neglect signs has been observed after a single application of PA for a few minutes (3-5 min), while PA repeated for two weeks led to long-term effects lasting up to 6 months [48][49][50][51]. However, neglect does not improve in all treated patients, and clinical studies including several RCTs failed to provide evidence for lasting effects of PA on its clinical manifestations [48,[52][53][54][55][56]. In a meta-analysis of eight RCTs [52-54,57-59], Li et al [60] found five reports showing that patients treated with PA showed significantly better scores in a neglect battery [61] than the control group [49,53,58,59,62].…”

Section: Effects Of Prism Adaptation On Spatial Neglectmentioning

confidence: 99%

Virtual Reality in the Rehabilitation of Cognitive Impairment after Stroke

Bourgeois

Schnider

Turri³

et al. 2023

CTN

Self Cite

View full text Add to dashboard Cite

Virtual reality (VR) is seen by some as a tool that may greatly improve, or even revolutionize cognitive rehabilitation. VR offers distinct advantages compared to classic rehabilitation using paper-and-pencil or computer-based training, such as immersion, the feeling of presence, embodiment of virtual players, ecological and multisensory stimulation. We here review recent clinical studies examining the effects of VR training in patients with stroke-induced cognitive deficits. Several trials reported evidence that VR training improves general cognition compared to standard cognitive training. However, the evidence remains controversial, as some of these studies had a high risk of bias. Regarding mood, there is some indication that immersive training improves depression scores in stroke patients, but the number of studies examining mood changes is very low. Finally, in the domain of spatial cognition the development of specific intervention techniques such as virtual prism adaptation provide avenues for clinical interventions, though well-controlled clinical trials are lacking. Together, the available evidence suggests that VR has the potential to improve rehabilitation particularly in domains requiring repetitive training in an immersed, ecological setting, or when a mismatch between body frames and the environment is created. Controlled clinical studies are required to examine the specific advantages of VR compared to classic interventions.

show abstract

What role for prism adaptation in the rehabilitation of pure neglect dyslexia?

Cited by 4 publications

References 47 publications

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

Adaptation to virtual prisms and its relevance for neglect rehabilitation: a single-blind dose-response study with healthy participants

Virtual Reality in the Rehabilitation of Cognitive Impairment after Stroke

Contact Info

Product

Resources

About