Spatial Neglect: Not Simply Disordered Attention

Danckert, James

doi:10.1007/978-1-4614-7672-6_5

Cited by 3 publications

(2 citation statements)

References 125 publications

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“…Although prisms may be a useful way to reduce some symptoms of neglect, and can be used to induce changes in attention and perceptual biases in healthy adults, other research suggests that prisms may have different effects depending on the nature of the experimental tasks used. Specifically, several studies suggest that prisms may have a greater influence on tests that require responses using the motor effectors that are directly influenced by adaptation (i.e., the eyes or the hand), but prisms may have less of an influence on tests that require purely perceptual responses (Danckert, 2014;Dijkerman et al, 2003;Ferber, Danckert, Joanisse, Goltz, & Goodale, 2003;Sarri, Greenwood, Kalra, & Driver, 2010;Striemer & Danckert, 2010a, 2010bStriemer, Ferber, & Danckert, 2013). Furthermore, some of our recent work (Striemer et al, 2016) examining the effects of different magnitudes of leftward PA in healthy adults demonstrated that a larger leftward prism shift (17°) led to a greater rightward shift in manual line bisection compared to a smaller leftward prism shift (8.5°).…”

Section: Introductionmentioning

confidence: 99%

Prism adaptation speeds reach initiation in the direction of the prism after-effect

Striemer

Borza

2017

Exp Brain Res

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Damage to the temporal-parietal cortex in the right hemisphere often leads to spatial neglect-a disorder in which patients are unable to attend to sensory input from their contralesional (left) side. Neglect has been associated with both attentional and premotor deficits. That is, in addition to having difficulty with attending to the left side, patients are often slower to initiate leftward vs. rightward movements (i.e., directional hypokinesia). Previous research has indicated that a brief period of adaptation to rightward shifting prisms can reduce symptoms of neglect by adjusting the patient's movements leftward, toward the neglected field. Although prism adaptation has been shown to reduce spatial attention deficits in patients with neglect, very little work has examined the effects of prisms on premotor symptoms. In the current study, we examined this in healthy individuals using leftward shifting prisms to induce a rightward shift in the egocentric reference frame, similar to neglect patients prior to prism adaptation. Specifically, we examined the speed with which healthy participants initiated leftward and rightward reaches (without visual feedback) prior to and following adaptation to either 17° leftward (n = 16) or 17° rightward (n = 15) shifting prisms. Our results indicated that, following adaptation, participants were significantly faster to initiate reaches towards targets located in the direction opposite the prism shift. That is, participants were faster to initiate reaches to right targets following leftward prism adaptation and were faster to initiate reaches to left targets following rightward prism adaptation. Overall, these results are consistent with the idea that prism adaptation can influence the speed with which a reach can be initiated toward a target in the direction opposite the prism shift, possibly through altering activity in neural circuits involved in reach planning.

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Section: Introductionmentioning

confidence: 99%

Prism adaptation speeds reach initiation in the direction of the prism after-effect

Striemer

Borza

2017

Exp Brain Res

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“…This, for instance, is demonstrated when patients deny ownership of left-sided extremities or claim that they can walk independently when they are in fact paralyzed (Gandola, et al, 2012; Pugnaghi, Molinari, Panzetti, Nichelli, & Zamboni, 2012). Nevertheless, neglect differs from intellectual dysfunction and psychiatric disorders, and patients usually express themselves confidently and smoothly (Danckert, 2014; Robertson & Halligan, 1999).…”

Section: Introductionmentioning

confidence: 99%

“Getting the Left Right”

et al. 2015

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We used a phenomenological approach to gain insight into the experiences of self, other, and world in patients with hemispatial neglect within the first month following stroke. Comprehensive descriptions of circumstances were conjoined with open-ended interviews of 12 participants. The neglect experience was captured in the overarching theme, "getting the left right," which encompasses the two subthemes of (a) surreal awareness of the left and (b) emergence of a different world. Patients had unclear perceptions of their own body and surroundings, their attention was brittle, and they encountered bewildering reactions from other people. They simultaneously pursued the ineffable neglected space and searched for coherence. The vulnerability, loss, and conflicting perceptions that patients with neglect face should be acknowledged and alleviation sought. Facilitating methods should provide additional opportunities for patients to communicate their experiences. We underscore the importance of readjusting the current approaches of neglect and emphasizing meaningfulness in professional guidance.

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Statistical and perceptual updating: correlated impairments in right brain injury

et al. 2014

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It has been hypothesized that many of the cognitive impairments commonly seen after right brain damage (RBD) can be characterized as a failure to build or update mental models. We (Danckert et al. in Neglect as a disorder of representational updating. NOVA Open Access, New York, 2012a; Cereb Cortex 22:2745-2760, 2012b) were the first to directly assess the association between RBD and updating and found that RBD patients were unable to exploit a strongly biased play strategy in their opponent in the children's game rock, paper, scissors. Given that this game required many other cognitive capacities (i.e., working memory, sustained attention, reward processing), RBD patients could have failed this task for various reasons other than a failure to update. To assess the generality of updating deficits after RBD, we had RBD, left brain-damaged (LBD) patients and healthy controls (HCs) describe line drawings that evolved gradually from one figure (e.g., rabbit) to another (e.g., duck) in addition to the RPS updating task. RBD patients took significantly longer to alter their perceptual report from the initial object to the final object than did LBD patients and HCs. Although both patient groups performed poorly on the RPS task, only the RBD patients showed a significant correlation between the two, very different, updating tasks. We suggest these data indicate a general deficiency in the ability to update mental representations following RBD.

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Spatial Neglect: Not Simply Disordered Attention

Cited by 3 publications

References 125 publications

Prism adaptation speeds reach initiation in the direction of the prism after-effect

Prism adaptation speeds reach initiation in the direction of the prism after-effect

“Getting the Left Right”

Statistical and perceptual updating: correlated impairments in right brain injury

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