Prism adaptation improves visual search in hemispatial neglect

Saevarsson, Styrmir; Kristjánsson, Árni; Hildebrandt, Helmut; Halsband, Ulrike

doi:10.1016/j.neuropsychologia.2008.11.026

Cited by 54 publications

(49 citation statements)

References 55 publications

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“…In this study, no effect of prism adaptation was observed on the attentional deployment in space in both healthy participants and neglect patients, although a recent study did find an effect on the visual search performance of neglect patients when unlimited search time was given to find a target [18]. The effect of prism adaptation on attentional deployment therefore appears to be restricted to neglect patients, see also Ref.…”

Section: Discussioncontrasting

confidence: 48%

Prism adaptation influences perception but not attention: evidence from antisaccades

et al. 2010

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Prism adaptation has been shown to successfully alleviate symptoms of hemispatial neglect, yet the underlying mechanism is still poorly understood. In this study, the antisaccade task was used to measure the effects of prism adaptation on spatial attention in healthy participants. Results indicated that prism adaptation did not influence the saccade latencies or antisaccade errors, both strong measures of attentional deployment, despite a successful prism adaptation procedure. In contrast to visual attention, prism adaptation evoked a perceptual bias in visual space as measured by the landmark task. We conclude that prism adaptation has a differential influence on visual attention and visual perception in healthy participants as measured by the tasks used.

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Section: Discussioncontrasting

confidence: 48%

Prism adaptation influences perception but not attention: evidence from antisaccades

et al. 2010

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“…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%

“…Lesions associated with neglect often include and/or disconnect the right IPS , which has been identified as key structure for pre-attentive and serial search (Donner et al, 2002;Nobre et al, 2003). Thus, it is not surprising that the spatial bias in preattentive and in serial search, which is often observed in neglect, fails to respond to rightward PA Saevarsson et al, 2009) 2 . Second, failure to respond to rightward PA may be due to differences in connectivity between the left IPL and visual areas on either side.…”

Section: Effects Of Rightward Prismatic Adaptation In Neglectmentioning

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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“…For example, reductions in neglect symptoms following rightward prism adaptation have been observed for tasks involving line bisection (Rossetti, Rode, Pisella, Farné, Li, Boisson, & Perenin, 1998; Pisella, Rode, Farne, Boisson, & Rossetti, 2002), shape cancellation (Rossetti et al, 1998; Serino, Bonifazi, Pierfederici, & Ladavas, 2007), body orientation judgments (Gossmann, Kastrup, Kerkhoff, LÓpez-Herrero, & Hildebrandt, 2013), visual search (Saevarsson, Kristjansson, Hildebrandt, & Halsband, 2009), haptic exploration (McIntosh, Rossetti, & Milner, 2002), straight-ahead pointing (Pisella et al, 2002), and attentional disengagement from ipsilesional hemispace (Schindler, McIntosh, Cassidy, Birchall, Benson, Ietswaart, & Milner, 2009). In addition, Bultitude, Rafal, and List (2009) demonstrated that adaptation to rightward-shifting prisms ameliorates the local processing bias of neglect patients.…”

Section: Introductionmentioning

confidence: 99%

Adaptation to leftward-shifting prisms enhances local processing in healthy individuals

Reed

Dassonville

2014

Neuropsychologia

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In healthy individuals, adaptation to left-shifting prisms has been shown to simulate the symptoms of hemispatial neglect, including a reduction in global processing that approximates the local bias observed in neglect patients. The current study tested whether leftward prism adaptation can more specifically enhance local processing abilities. In three experiments, the impact of local and global processing was assessed through tasks that measure susceptibility to illusions that are known to be driven by local or global contextual effects. Susceptibility to the rod-and-frame illusion – an illusion disproportionately driven by both local and global effects depending on frame size – was measured before and after adaptation to left- and right-shifting prisms. A significant increase in rod-and-frame susceptibility was found for the left-shifting prism group, suggesting that adaptation caused an increase in local processing effects. The results of a second experiment confirmed that leftward prism adaptation enhances local processing, as assessed with susceptibility to the simultaneous-tilt illusion. A final experiment employed a more specific measure of the global effect typically associated with the rod-andframe illusion, and found that although the global effect was somewhat diminished after leftward prism adaptation, the trend failed to reach significance (p = .078). Rightward prism adaptation had no significant effects on performance in any of the experiments. Combined, these findings indicate that leftward prism adaptation in healthy individuals can simulate the local processing bias of neglect patients primarily through an increased sensitivity to local visual cues, and confirm that prism adaptation not only modulates lateral shifts of attention, but also prompts shifts from one level of processing to another.

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Prism adaptation improves visual search in hemispatial neglect

Cited by 54 publications

References 55 publications

Prism adaptation influences perception but not attention: evidence from antisaccades

Prism adaptation influences perception but not attention: evidence from antisaccades

Modulation of visual attention by prismatic adaptation

Adaptation to leftward-shifting prisms enhances local processing in healthy individuals

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