Space re-exploration in hemispatial neglect

Parton, Andrew; Malhotra, Paresh; Nachev, Parashkev; Ames, Diane; Ball, Joanna; Chataway, Jeremy; Husain, Masud

doi:10.1097/01.wnr.0000220130.86349.a7

Cited by 66 publications

(84 citation statements)

References 16 publications

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“…Karnath analyzed exploration of a large space by eye and head movements adopting magnetic transducers placed on the eye and on the head [39]. Parton proposed an exploration task on a touchscreen for studying the re-exploration of already touched items which may be alternatively simply tagged, cancelled or enhanced [40].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Features of Visual Exploration in Unilaterally Brain-Damaged Subjects with or without Neglect: Results from a Touchscreen Test

et al. 2012

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Cognitive assessment in a clinical setting is generally made by pencil-and-paper tests, while computer-based tests enable the measurement and the extraction of additional performance indexes. Previous studies have demonstrated that in a research context exploration deficits occur also in patients without evidence of unilateral neglect at pencil-and-paper tests. The objective of this study is to apply a touchscreen-based cancellation test, feasible also in a clinical context, to large groups of control subjects and unilaterally brain-damaged patients, with and without unilateral spatial neglect (USN), in order to assess disturbances of the exploratory skills. A computerized cancellation test on a touchscreen interface was used for assessing the performance of 119 neurologically unimpaired control subjects and 193 patients with unilateral right or left hemispheric brain damage, either with or without USN. A set of performance indexes were defined including Latency, Proximity, Crossings and their spatial lateral gradients, and Preferred Search Direction. Classic outcome scores were computed as well. Results show statistically significant differences among groups (assumed p<0.05). Right-brain-damaged patients with USN were significantly slower (median latency per detected item was 1.18 s) and less efficient (about 13 search-path crossings) in the search than controls (median latency 0.64 s; about 3 crossings). Their preferred search direction (53.6% downward, 36.7% leftward) was different from the one in control patients (88.2% downward, 2.1% leftward). Right-brain-damaged patients without USN showed a significantly abnormal behavior (median latency 0.84 s, about 5 crossings, 83.3% downward and 9.1% leftward direction) situated half way between controls and right-brain-damaged patients with USN. Left-brain-damaged patients without USN were significantly slower and less efficient than controls (latency 1.19 s, about 7 crossings), preserving a normal preferred search direction (93.7% downward). Therefore, the proposed touchscreen-based assessment had evidenced disorders in spatial exploration also in patients without clinically diagnosed USN.

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Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Features of Visual Exploration in Unilaterally Brain-Damaged Subjects with or without Neglect: Results from a Touchscreen Test

et al. 2012

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“…Re-exploration behavior in neglect has often been related to spatial working memory impairment (e.g., Husain et al, 2001;Mannan et al, 2005;Parton et al, 2006;Wojciulik, Husain, Clarke, & Driver, 2001). However, in these studies, no direct evaluation of spatial working memory was carried out, since it was the recancellation behavior itself that was considered as a measure of impaired spatial working memory.…”

Section: Discussionmentioning

confidence: 99%

Support for distinct subcomponents of spatial working memory: A double dissociation between spatial–simultaneous and spatial–sequential performance in unilateral neglect

Wansard

Bastin

Segovia

et al. 2015

Cognitive Neuropsychology

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Over the last decade, many studies have demonstrated that visuo-spatial working memory (VSWM) can be divided into separate subsystems dedicated to the retention of visual patterns and their serial order. Impaired VSWM has been suggested to exacerbate left visual neglect in rightbrain damaged individuals. The aim of this study was to investigate the segregation between spatial-sequential and spatial-simultaneous working memory in individuals with neglect. We demonstrated that patterns of results on these VSWM tasks can be dissociated. Spatialsimultaneous and sequential aspects of VSWM can be selectively impaired in unilateral neglect.Our results support the hypothesis of multiple VSWM subsystems, which should be taken into account to better understand neglect-related deficits.

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“…For instance, several recent studies of neglect patients required subjects to remember sequentially presented locations arrayed in a vertical line. The results showed that neglect patients had impaired spatial WM performance (Malhotra, Mannan, Driver, and Husain, 2004; Malhotra et al, 2005; Parton, Malhotra, Nachev, Ames, Ball, Chataway, and Husain, 2006). When the eye-movements of neglect patients were assessed in visual search tasks, it was shown that they tend to revisit previously foveated items as if they were new items, indicative of a spatial WM impairment (Husain et al, 2001; Wojciulik, Husain, Clarke, and Driver, 2001).…”

Section: Working Memory For Spatial Attributesmentioning

confidence: 97%

Some surprising findings on the involvement of the parietal lobe in human memory

Olson

Berryhill

2009

Neurobiology of Learning and Memory

150

128

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The posterior parietal lobe is known to play some role in a far-flung list of mental processes: linking vision to action (saccadic eye movements, reaching, grasping), attending to visual space, numerical calculation, and mental rotation. Here we review findings from humans and monkeys that illuminate an untraditional function of this region: memory. Our review draws on neuroimaging findings that have repeatedly identified parietal lobe activations associated with short-term or working memory and episodic memory. We also discuss recent neuropsychological findings showing that individuals with parietal lobe damage exhibit both working memory and long-term memory deficits. These deficits are not ubiquitous; they are only evident under certain retrieval demands. Our review elaborates on these findings and evaluates various theories about the mechanistic role of the posterior parietal lobe in memory. The available data point towards the conclusion that the posterior parietal lobe plays an important role in memory retrieval irrespective of elapsed time. The two models that are best supported by existing data are the Attention to Memory Model and the Subjective Memory Model. We conclude by formalizing several open questions that are intended to encourage future research.Keywords parietal lobe; Balint's syndrome; short-term memory; working memory; episodic memory; spatial processing; retrieval; episodic buffer; meta-memory If you were to peruse any textbook on memory or neuroscience, you would be hard-pressed to find the terms "memory" and "parietal lobe" together. How then, do we explain the large number of neuroimaging findings reporting parietal lobe activations to various mnemonic demands? The sheer volume of these findings raises the question of whether the parietal lobe plays a functional role in mnemonic processing that has been overlooked.To address this question, we review evidence linking the parietal lobe to memory. We focus on visual short-term or working memory (WM) and episodic memory for the simple reason that there is now sufficient material in these literatures to provide some nascent consensus. We note that links between verbal WM and parietal lobe function has recently been reviewed elsewhere (Buchsbaum and D'Esposito, 2008).Corresponding author: Ingrid R. Olson, Department of Psychology, Temple University, 1701 N. 13 th Street, Philadelphia, PA 19122, Telephone: 215-204-7318, Email: iolson@temple.edu. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. NIH Public Access Anatomy and Connectivity of the Posterior Parietal CortexBecause in vivo axon tracin...

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Space re-exploration in hemispatial neglect

Cited by 66 publications

References 16 publications

Spatio-Temporal Features of Visual Exploration in Unilaterally Brain-Damaged Subjects with or without Neglect: Results from a Touchscreen Test

Spatio-Temporal Features of Visual Exploration in Unilaterally Brain-Damaged Subjects with or without Neglect: Results from a Touchscreen Test

Support for distinct subcomponents of spatial working memory: A double dissociation between spatial–simultaneous and spatial–sequential performance in unilateral neglect

Some surprising findings on the involvement of the parietal lobe in human memory

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