Through a prism darkly: re-evaluating prisms and neglect

Striemer, Christopher L.; Danckert, James

doi:10.1016/j.tics.2010.04.001

Cited by 89 publications

(71 citation statements)

References 73 publications

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“…In order to understand the cognitive and neural mechanisms that underlie this intervention, it is important to examine tasks on which this technique has no impact, as well as those for which improvements are observed. Our finding that prism adaptation does not alter configural processing of faces is consistent with the dorsal versus ventral stream processing model proposed by Striemer and Danckert 36 . Studies that directly compare the effects of prism adaptation on classic dorsal and ventral stream tasks would further illuminate the mechanisms of the beneficial effects of this intervention on hemispatial neglect.…”

Section: Discussionsupporting

confidence: 92%

“…Striemer and Danckert 36 proposed that the beneficial effects of prism adaptation are limited to dorsal stream attentional and visuomotor behaviours, whereas ventral stream perceptual processes are relatively unaffected. Many of the tasks on which neglect patients have shown improvement following neglect, such as pen-and-paper tasks 9, 40 , reading 41 , haptic exploration 12 , postural imbalance 42 and wheel-chair navigation 43 , can be explained by a leftward shift in motor behaviour (including eye movements).…”

Section: Discussionmentioning

confidence: 99%

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Prism adaptation does not alter configural processing of faces

2013

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Patients with hemispatial neglect (‘neglect’) following a brain lesion show difficulty responding or orienting to objects and events on the left side of space. Substantial evidence supports the use of a sensorimotor training technique called prism adaptation as a treatment for neglect. Reaching for visual targets viewed through prismatic lenses that induce a rightward shift in the visual image results in a leftward recalibration of reaching movements that is accompanied by a reduction of symptoms in patients with neglect. The understanding of prism adaptation has also been advanced through studies of healthy participants, in whom adaptation to leftward prismatic shifts results in temporary neglect-like performance. Interestingly, prism adaptation can also alter aspects of non-lateralised spatial attention. We previously demonstrated that prism adaptation alters the extent to which neglect patients and healthy participants process local features versus global configurations of visual stimuli. Since deficits in non-lateralised spatial attention are thought to contribute to the severity of neglect symptoms, it is possible that the effect of prism adaptation on these deficits contributes to its efficacy. This study examines the pervasiveness of the effects of prism adaptation on perception by examining the effect of prism adaptation on configural face processing using a composite face task. The composite face task is a persuasive demonstration of the automatic global-level processing of faces: the top and bottom halves of two familiar faces form a seemingly new, unknown face when viewed together. Participants identified the top or bottom halves of composite faces before and after prism adaptation. Sensorimotor adaptation was confirmed by significant pointing aftereffect, however there was no significant change in the extent to which the irrelevant face half interfered with processing. The results support the proposal that the therapeutic effects of prism adaptation are limited to dorsal stream processing.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Prism adaptation does not alter configural processing of faces

2013

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“…Although there have been a large number of behavioral studies investigating the effects of prism adaptation on spatial cognition in neurologically healthy participants and brainlesioned patients (for reviews, see Luauté, Halligan, Rode, Jacquin-Courtois, & Boisson, 2006;Michel et al, 2003;Newport & Schenk, 2012;Striemer & Danckert, 2010), only a few groups have succeeded in using functional magnetic resonance imaging (fMRI) to study changes in brain activity induced by prism adaptation (Chapman et al, 2010;Danckert, Ferber, & Goodale, 2008;Küper et al, 2014;Luauté et al, 2009). fMRI investigations of prism adaptation face several major challenges, which fall into two categories.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Studying the neural bases of prism adaptation using fMRI: A technical and design challenge

et al. 2016

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Prism adaptation induces rapid recalibration of visuomotor coordination. The neural mechanisms of prism adaptation have come under scrutiny since the observations that the technique can alleviate hemispatial neglect following stroke, and can alter spatial cognition in healthy controls. Relative to non-imaging behavioral studies, fMRI investigations of prism adaptation face several challenges arising from the confined physical environment of the scanner and the supine position of the participants. Any researcher who wishes to administer prism adaptation in an fMRI environment must adjust their procedures enough to enable the experiment to be performed, but not so much that the behavioral task departs too much from true prism adaptation. Furthermore, the specific temporal dynamics of behavioral components of prism adaptation present additional challenges for measuring their neural correlates. We developed a system for measuring the key features of prism adaptation behavior within an fMRI environment. To validate our configuration, we present behavioral (pointing) and head movement data from 11 righthemisphere lesioned patients and 17 older controls who underwent sham and real prism adaptation in an MRI scanner. Most participants could adapt to prismatic displacement with minimal head movements, and the procedure was well tolerated. We propose recommendations for fMRI studies of prism adaptation based on the design-specific constraints and our results.

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“…The work on perturbation of visual field – prisms adaptation (PA) – provided important insights into visuo-spatial processing that may be related to the reviewed experiments (Striemer and Danckert, 2010). According to the classic PA procedure developed by Richard Held and colleagues, participants are asked to repeatedly perform goal-directed movements while wearing prismatic goggles (Held and Freedman, 1963; Redding and Wallace, 1997).…”

Section: Full-body Illusions and Self-consciousnessmentioning

confidence: 99%

Multi-Sensory and Sensorimotor Foundation of Bodily Self-Consciousness – An Interdisciplinary Approach

Ionta¹,

Gassert²,

Blanke³

2011

Front. Psychology

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Scientific investigations on the nature of the self have so far focused on high-level mechanisms. Recent evidence, however, suggests that low-level bottom-up mechanisms of multi-sensory integration play a fundamental role in encoding specific components of bodily self-consciousness, such as self-location and first-person perspective (Blanke and Metzinger, 2009). Self-location and first-person perspective are abnormal in neurological patients suffering from out-of-body experiences (Blanke et al., 2004), and can be manipulated experimentally in healthy subjects by imposing multi-sensory conflicts (Lenggenhager et al., 2009). Activity of the temporo-parietal junction (TPJ) reflects experimentally induced changes in self-location and first-person perspective (Ionta et al., 2011), and dysfunctions in TPJ are causally associated with out-of-body experiences (Blanke et al., 2002). We argue that TPJ is one of the key areas for multi-sensory integration of bodily self-consciousness, that its levels of activity reflect the experience of the conscious “I” as embodied and localized within bodily space, and that these mechanisms can be systematically investigated using state of the art technologies such as robotics, virtual reality, and non-invasive neuroimaging.

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Through a prism darkly: re-evaluating prisms and neglect

Cited by 89 publications

References 73 publications

Prism adaptation does not alter configural processing of faces

Prism adaptation does not alter configural processing of faces

Studying the neural bases of prism adaptation using fMRI: A technical and design challenge

Multi-Sensory and Sensorimotor Foundation of Bodily Self-Consciousness – An Interdisciplinary Approach

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