1
|
Abe M, Ishiai S. Mental representation of a line when patients with left unilateral spatial neglect bisect it: A study with an endpoint reproduction task. J Neuropsychol 2021; 16:283-298. [PMID: 34159740 DOI: 10.1111/jnp.12258] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 06/02/2021] [Indexed: 11/30/2022]
Abstract
Patients with left unilateral spatial neglect (USN) typically place the subjective midpoint to the right of the objective centre. Based on the previous findings (e.g., Ishiai et al. 1989, Brain, 112, 1485), we hypothesized that the patients with left USN may see the representational image of a line that extends equally towards either side of the subjective midpoint depending not upon the information about the leftward extent. The present study tested whether patients with left USN would place the subjective midpoint at the centre of their mental representation of the line. The participants were 10 patients with left USN and 10 neurologically healthy controls. We devised a new 'endpoint reproduction task' using a computer display with a touch panel to seek the representational image when patients with left USN bisect lines and asked the participants to reproduce the location of the right or left endpoint after bisecting lines. The results showed that the representational image of the bisected line depends primarily on the location of the objective right endpoint, not on the location of the objective left endpoint in space. The analyses of the estimated right and left representational extents confirmed our hypotheses that patients with left USN would bisect a line seeing the representational line image that centred across their subjective midpoint. We believe that the findings of the present study with the use of the endpoint reproduction task will contribute to a better understanding of the visuospatial process underlying line bisection of patients with left USN.
Collapse
Affiliation(s)
- Masako Abe
- Department of Speech and Hearing Sciences, International University of Health and Welfare, Tochigi, Japan
| | - Sumio Ishiai
- Department of Rehabilitation Medicine, Sapporo Medical University School of Medicine, Hokkaido, Japan
| |
Collapse
|
2
|
Fabius J, Ten Brink AF, Van der Stigchel S, Nijboer TCW. The relationship between visuospatial neglect, spatial working memory and search behavior. J Clin Exp Neuropsychol 2020; 42:251-262. [PMID: 31900083 DOI: 10.1080/13803395.2019.1707779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Visuospatial neglect (VSN) is characterized by a lateralized attentional deficit in the visual domain. In addition, patients with VSN might have an impairment in the temporary storage of spatial information in working memory (spatial working memory; SWM) that, like VSN, could impair systematic searching behavior. Several studies have demonstrated either SWM impairments or impaired searching behavior in VSN patients. Here, we related SWM performance to search behavior in patients with and without VSN. We assessed SWM using a novel task in a group of 182 stroke patients (24 with VSN, 158 without) and 65 healthy controls. We related SWM performance to available stroke-related and cognitive data. Patients with VSN exhibited lower SWM performance than patients without VSN and healthy controls. Additional control analyses indicated that differences in SWM performance are specific to visuospatial processing, instead of e.g. verbal working memory or the general level of physical disability. Last, we related SWM performance to visual search performance on cancellation tasks, one where their cancellation markings remained visible and another one where their prior cancellations markings were invisible to the patient and therefore patients had to remember which targets they had canceled. SWM performance correlated with search organization. Together, these results from a large sample of stroke patients corroborate the findings of earlier studies, while excluding several alternative explanations: SWM impairment is a part of the neglect syndrome, and SWM impairments are related to search behavior.
Collapse
Affiliation(s)
- Jasper Fabius
- Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.,Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Antonia F Ten Brink
- Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.,Department of Psychology, University of Bath, Bath, UK
| | - Stefan Van der Stigchel
- Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands
| | - Tanja C W Nijboer
- Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.,Center of Excellence for Rehabilitation Medicine, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht University and De Hoogstraat Rehabilitation, Utrecht, The Netherlands
| |
Collapse
|
3
|
Pierce J, Saj A. A critical review of the role of impaired spatial remapping processes in spatial neglect. Clin Neuropsychol 2018; 33:948-970. [DOI: 10.1080/13854046.2018.1503722] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jordan Pierce
- Department of Neurosciences, University of Geneva, Geneva, Switzerland
| | - Arnaud Saj
- Department of Neurosciences, University of Geneva, Geneva, Switzerland
- Department of Neurology, University Hospital of Geneva, Geneva, Switzerland
| |
Collapse
|
4
|
Saj A, Verdon V, Hauert CA, Vuilleumier P. Dissociable components of spatial neglect associated with frontal and parietal lesions. Neuropsychologia 2018; 115:60-69. [DOI: 10.1016/j.neuropsychologia.2018.02.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 02/03/2018] [Accepted: 02/16/2018] [Indexed: 12/19/2022]
|
5
|
Toba MN, Rabuffetti M, Duret C, Pradat-Diehl P, Gainotti G, Bartolomeo P. Component deficits of visual neglect: “Magnetic” attraction of attention vs. impaired spatial working memory. Neuropsychologia 2018; 109:52-62. [DOI: 10.1016/j.neuropsychologia.2017.11.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/07/2017] [Accepted: 11/29/2017] [Indexed: 12/18/2022]
|
6
|
Gutierrez-Herrera M, Saevarsson S, Huber T, Hermsdörfer J, Stadler W. Repetitive TMS in right sensorimotor areas affects the selection and completion of contralateral movements. Cortex 2017; 90:46-57. [DOI: 10.1016/j.cortex.2017.02.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 12/21/2016] [Accepted: 02/14/2017] [Indexed: 10/20/2022]
|
7
|
Implicit learning: A way to improve visual search in spatial neglect? Conscious Cogn 2016; 43:102-12. [PMID: 27262690 DOI: 10.1016/j.concog.2016.05.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 05/25/2016] [Accepted: 05/25/2016] [Indexed: 11/22/2022]
Abstract
Studies have shown that neglect patients are able to use stimulus regularities to orient faster toward the neglected side, without necessarily being aware of that information, or at the very least without being able to verbalize their knowledge. In order to better control for the involvement of explicit processes, the present study sought to test neglect patients' ability to detect more complex associations between stimuli using tasks similar to those used in implicit learning studies. Our results demonstrate that neglect patients had difficulties implicitly learning complex associations, contrary to what we found with controls. The possible influence of attentional and working memory impairments are discussed.
Collapse
|
8
|
Wansard M, Meulemans T, Geurten M. Shedding new light on representational neglect: The importance of dissociating visual and spatial components. Neuropsychologia 2016; 84:150-7. [DOI: 10.1016/j.neuropsychologia.2016.02.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 12/29/2015] [Accepted: 02/14/2016] [Indexed: 10/22/2022]
|
9
|
Abstract
The visual search paradigm has had an enormous impact in many fields. A theme running through this literature has been the distinction between preattentive and attentive processing, which I refer to as the two-stage assumption. Under this assumption, slopes of set-size and response time are used to determine whether attention is needed for a given task or not. Even though a lot of findings question this two-stage assumption, it still has enormous influence, determining decisions on whether papers are published or research funded. The results described here show that the two-stage assumption leads to very different conclusions about the operation of attention for identical search tasks based only on changes in response (presence/absence versus Go/No-go responses). Slopes are therefore an ambiguous measure of attentional involvement. Overall, the results suggest that the two-stage model cannot explain all findings on visual search, and they highlight how slopes of response time and set-size should only be used with caution.
Collapse
Affiliation(s)
- Árni Kristjánsson
- Department of Psychology, School of Health Sciences, University of Iceland, Iceland
| |
Collapse
|
10
|
Wansard M, Bartolomeo P, Bastin C, Segovia F, Gillet S, Duret C, Meulemans T. Support for distinct subcomponents of spatial working memory: A double dissociation between spatial–simultaneous and spatial–sequential performance in unilateral neglect. Cogn Neuropsychol 2015; 32:14-28. [DOI: 10.1080/02643294.2014.995075] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
11
|
Wansard M, Meulemans T, Gillet S, Segovia F, Bastin C, Toba MN, Bartolomeo P. Visual neglect: is there a relationship between impaired spatial working memory and re-cancellation? Exp Brain Res 2014; 232:3333-43. [PMID: 24989636 DOI: 10.1007/s00221-014-4028-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 06/18/2014] [Indexed: 10/25/2022]
Abstract
In visual search tasks, neglect patients tend to explore and repeatedly re-cancel stimuli on the ipsilesional side, as if they did not realize that they had previously examined the rightward locations favoured by their lateral bias. The aim of this study was to explore the hypothesis that a spatial working memory deficit explains these ipsilesional re-cancellation errors in neglect patients. For the first time, we evaluated spatial working memory and re-cancellation through separate and independent tasks in a group of patients with right hemisphere damage and a diagnosis of left neglect. Results showed impaired spatial working memory in neglect patients. Compared to the control group, neglect patients cancelled fewer targets and made more re-cancellations both on the left side and on the right side. The spatial working memory deficit appears to be related to re-cancellations, but only for some neglect patients. Alternative interpretations of re-exploration of space are discussed.
Collapse
Affiliation(s)
- Murielle Wansard
- Neuropsychology Unit, Department of Psychology, Behavior and Cognition, University of Liège, Boulevard du Rectorat, B33, 4000, Liège, Belgium,
| | | | | | | | | | | | | |
Collapse
|
12
|
Vuilleumier P. Mapping the functional neuroanatomy of spatial neglect and human parietal lobe functions: progress and challenges. Ann N Y Acad Sci 2013; 1296:50-74. [PMID: 23751037 DOI: 10.1111/nyas.12161] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Spatial neglect is generally defined by various deficits in processing information from one (e.g., left) side of space contralateral to focal (e.g., right) hemisphere damage. Although classically associated with parietal lobe functions, there is now compelling evidence that neglect can follow lesions in many different cortical and subcortical sites, suggesting a dysfunction in distributed brain networks. In addition, neglect is likely to result from a combination of distinct deficits that co-occur due to concomitant damage affecting juxtaposed brain areas and their connections, but the exact nature of core deficits and their neural substrates still remains unclear. The present review describes recent progress in identifying functional components of the neglect syndrome and relating them to distinct subregions of parietal cortex. A comprehensive understanding of spatial neglect will require a more precise definition of cognitive processes implicated in different behavioral manifestations, as well as meticulous mapping of these processes onto specific brain circuits, while taking into account functional changes in activity that may arise in structurally intact areas subsequent to damage in distant portions of the relevant networks.
Collapse
Affiliation(s)
- Patrik Vuilleumier
- Laboratory for Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, Medical School, and University Hospital of Geneva, University of Geneva, Michel-Servet 1, Geneva, Switzerland.
| |
Collapse
|
13
|
Saj A, Cojan Y, Vocat R, Luauté J, Vuilleumier P. Prism adaptation enhances activity of intact fronto-parietal areas in both hemispheres in neglect patients. Cortex 2013; 49:107-19. [DOI: 10.1016/j.cortex.2011.10.009] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 09/15/2011] [Accepted: 10/21/2011] [Indexed: 11/24/2022]
|
14
|
Saevarsson S, Halsband U, Kristjansson A. Designing rehabilitation programs for neglect: could 2 be more than 1+1? APPLIED NEUROPSYCHOLOGY 2011; 18:95-106. [PMID: 21660761 PMCID: PMC4544767 DOI: 10.1080/09084282.2010.547774] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Unilateral neglect is a multimodal neuropsychological disorder that has puzzled scientists for a long time. Many interventions have been developed, but only a handful has proven to be effective. This review examines whether applying different therapeutic techniques in combination will increase therapeutic benefits. Studies were reviewed where therapies are applied sequentially or in combination with other techniques. The results indicate that combining different interventions leads to increased general improvement compared with other noncombined designs, even when the number of treatment sessions is not constant. Practical and theoretical aspects of different treatments are discussed. The combined approach to treatment may have direct relevance to disorders other than neglect. This report introduces a new classification scheme for different interventions with the aim of facilitating more focused therapy. Finally, suggestions are made as to what the focus of future studies of neglect therapy should be and how therapeutic benefits might be maximized.
Collapse
Affiliation(s)
- Styrmir Saevarsson
- Department of Psychology, Neuropsychology, University of Freiburg, Germany.
| | | | | |
Collapse
|
15
|
Abstract
Unilateral spatial neglect is a common neurological syndrome following predominantly right hemisphere injuries and is characterized by both spatial and non-spatial deficits. Core spatial deficits involve mechanisms for saliency coding, spatial attention, and short-term memory and occur in conjunction with nonspatial deficits that involve reorienting, target detection, and arousal/vigilance. We argue that neglect is better explained by the dysfunction of distributed cortical networks for the control of attention than by structural damage of specific brain regions. Ventral lesions in right parietal, temporal, and frontal cortex that cause neglect directly impair nonspatial functions partly mediated by a ventral frontoparietal attention network. Structural damage in ventral cortex also induces physiological abnormalities of task-evoked activity and functional connectivity in a dorsal frontoparietal network that controls spatial attention. The anatomy and right hemisphere dominance of neglect follow from the anatomy and laterality of the ventral regions that interact with the dorsal attention network.
Collapse
Affiliation(s)
- Maurizio Corbetta
- Departments of Neurology, Radiology, and Anatomy and Neurobiology, Washington University School of Medicine, 314-362-4530, 4525 Scott Avenue, St. Louis, MO 63110
| | - Gordon L. Shulman
- Department of Neurology, Washington University School of Medicine, 314-362-8880, 4525 Scott Avenue. St. Louis, MO 63110
| |
Collapse
|
16
|
Saevarsson S, Kristjansson A, Halsband U. Strength in numbers: combining neck vibration and prism adaptation produces additive therapeutic effects in unilateral neglect. Neuropsychol Rehabil 2010; 20:704-24. [PMID: 20503132 PMCID: PMC3129649 DOI: 10.1080/09602011003737087] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Unilateral neglect is a multifaceted disorder. Many authors have, for this reason, speculated that the best treatment for neglect will involve combinations of different therapeutic techniques. Two well-known interventions, neck vibration (NV) and prism adaptation (PA), have often been considered to be among the most effective treatments for neglect. Here, two experiments were performed to explore possible additive benefits when these interventions are used in combination to treat chronic neglect. Both experimental groups received NV for 20 minutes, while the second group received simultaneous PA. The effects of treatment were measured with a time-restricted and feedback-based visual search task, which has previously been found to abolish the beneficial effects of PA, and with standard neglect tests. Baseline and intervention measures were performed on separate days. Findings for both groups indicated improved visual search following intervention, but the patients that underwent the combined intervention (NVPA) showed clear improvements on visual search paper and pencil neglect tests unlike the NV-only group. Overall, our results suggest that PA strengthens the effects of NV and that feedback-based tasks do not abolish the beneficial effects of PA, when NV is applied simultaneously. The results support the view that the most effective treatment for neglect will involve the combination of different treatments.
Collapse
|