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"Hemispatial neglect"

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https://www.readbyqxmd.com/read/28512354/neglect-patients-exhibit-egocentric-or-allocentric-neglect-for-the-same-stimulus-contingent-upon-task-demands
#1
Louise-Ann Leyland, Hayward J Godwin, Valerie Benson, Simon P Liversedge
Hemispatial Neglect (HN) is a failure to allocate attention to a region of space opposite to where damage has occurred in the brain, usually the left side of space. It is widely documented that there are two types of neglect: egocentric neglect (neglect of information falling on the individual's left side) and allocentric neglect (neglect of the left side of each object, regardless of the position of that object in relation to the individual). We set out to address whether neglect presentation could be modified from egocentric to allocentric through manipulating the task demands whilst keeping the physical stimulus constant by measuring the eye movement behaviour of a single group of neglect patients engaged in two different tasks (copying and tracing)...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28464421/low-frequency-rtms-of-the-unaffected-hemisphere-in-stroke-patients-a-systematic-review
#2
REVIEW
L Sebastianelli, V Versace, S Martignago, F Brigo, E Trinka, L Saltuari, R Nardone
The aim of this review was to summarize the evidence for the effectiveness of low-frequency (LF) repetitive transcranial magnetic stimulation (rTMS) over the unaffected hemisphere in promoting functional recovery after stroke. We performed a systematic search of the studies using LF-rTMS over the contralesional hemisphere in stroke patients and reviewed the 67 identified articles. The studies have been gathered together according to the time interval that had elapsed between the stroke onset and the beginning of the rTMS treatment...
May 2, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28429801/the-dizzy-patient-don-t-forget-disorders-of-the-central-vestibular-system
#3
REVIEW
Thomas Brandt, Marianne Dieterich
Vertigo and dizziness are among the most common complaints in neurology clinics, and they account for about 13% of the patients entering emergency units. In this Review, we focus on central vestibular disorders, which are mostly attributable to acute unilateral lesions of the bilateral vestibular circuitry in the brain. In a tertiary interdisciplinary outpatient dizziness unit, central vestibular disorders, including vestibular migraine, comprise about 25% of the established diagnoses. The signs and symptoms of these disorders can mimic those of peripheral vestibular disorders with sustained rotational vertigo...
April 21, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28359924/prolonged-cerebral-hyperperfusion-and-subcortical-low-intensity-on-fluid-attenuated-inversion-recovery-images-unusual-manifestation-after-removal-of-organized-chronic-subdural-hematoma
#4
Satoru Tanioka, Yu Sato, Kazuhiko Tsuda, Shigehiko Niwa, Hidenori Suzuki
BACKGROUND: Cerebral hyperperfusion sometimes occurs after removal of chronic subdural hematoma (CSH) and usually resolves within a few days without any symptoms. Subcortical low intensity (SCLI) on fluid attenuated inversion recovery (FLAIR) magnetic resonance images is rare and has been reported in some diseases other than CSH. The authors describe a case of organized CSH who suffered prolonged neurologic deterioration, SCLI and cerebral hyperperfusion postoperatively. CASE DESCRIPTION: An 81-year-old man, presenting with left hemiparesis, underwent craniotomy for right organized CSH after 2-time burr-hole surgeries...
March 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28323684/shifting-spatial-neglect-with-repeated-line-bisections-possible-role-of-lateralized-attentional-fatigue
#5
Mary Woods, John B Williamson, Keith D White, Charles G Maitland, Kenneth M Heilman
BACKGROUND AND OBJECTIVE: Many patients who have signs of neglect immediately after a right hemisphere stroke remain disabled even when they improve on tests of neglect. Few patients are tested for attentional persistence and fatigue despite their importance in many instrumental activities. To investigate whether stimulus repetition might alter the allocation of attention, we repeatedly tested a patient 16 weeks after she developed hemispatial neglect from a right hemisphere stroke. METHODS: During each of three testing sessions given in 1 day, we asked the patient to bisect 90 lines of two lengths, presented in 30-trial blocks in three locations: left, center, and right of her midsagittal plane, partially counterbalanced across sessions...
March 2017: Cognitive and Behavioral Neurology: Official Journal of the Society for Behavioral and Cognitive Neurology
https://www.readbyqxmd.com/read/28290071/structural-connectivity-in-spatial-attention-network-reconstruction-from-left-hemispatial-neglect
#6
Takaaki Hattori, Kenji Ito, Chika Nakazawa, Yoshiyuki Numasawa, Mayumi Watanabe, Shigeki Aoki, Hidehiro Mizusawa, Sumio Ishiai, Takanori Yokota
Left hemispatial neglect (neglect) is an impaired state of spatial attention. We aimed to reconstruct structural connectivity in the spatial attention network and to identify disconnection patterns underlying neglect. We enrolled 59 right-handed patients who had their first-ever infarction in the right hemisphere and classified them into neglect group (34 patients with neglect) and control group (25 patients without neglect). The neglect group was further subcategorized into 6 subgroups based on infarcted vascular territories...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28272901/attentional-impairments-following-right-hemisphere-damage-with-and-without-hemispatial-neglect-a-comparative-study
#7
Cristina Elizabeth Izábal Wong, Laura Damiani Branco, Charles Cotrena, Yves Joanette, Rochele Paz Fonseca
This study aimed to evaluate the performance of patients with right hemisphere damage (RHD) with or without hemispatial neglect (HN) on a cancellation task. The study involved 31 control participants and 31 patients with RHD, matched by age, education, and frequency of reading and writing habits. The numbers of omission and random errors as well as the mean time to task completion were compared between adults with and without RHD, as well as between patients with and without HN. The latter made more left-sided omission errors, and more overall omission errors, than patients with RHD and no HN...
March 8, 2017: Applied Neuropsychology. Adult
https://www.readbyqxmd.com/read/28149091/corpus-callosum-and-neglect-syndrome-clinical-findings-after-meningioma-removal-and-anatomical-review
#8
REVIEW
David Gomes, Madalena Fonseca, Maria Garrotes, Maria Rita Lima, Marta Mendonça, Mariana Pereira, Miguel Lourenço, Edson Oliveira, José Pedro Lavrador
Two types of neglect are described: hemispatial and motivational neglect syndromes. Neglect syndrome is a neurophysiologic condition characterized by a malfunction in one hemisphere of the brain, resulting in contralateral hemispatial neglect in the absence of sensory loss and the right parietal lobe lesion being the most common anatomical site leading to it. In motivational neglect, the less emotional input is considered from the neglected side where anterior cingulate cortex harbors the most frequent lesions...
January 2017: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/28116988/efficacy-of-home-based-visuomotor-feedback-training-in-stroke-patients-with-chronic-hemispatial-neglect
#9
Stéphanie Rossit, Christopher S Y Benwell, Larissa Szymanek, Gemma Learmonth, Laura McKernan-Ward, Elaine Corrigan, Keith Muir, Ian Reeves, George Duncan, Philip Birschel, Margaret Roberts, Katrina Livingstone, Hazel Jackson, Pauline Castle, Monika Harvey
Hemispatial neglect is a severe cognitive condition frequently observed after a stroke, associated with unawareness of one side of space, disability and poor long-term outcome. Visuomotor feedback training (VFT) is a neglect rehabilitation technique that involves a simple, inexpensive and feasible training of grasping-to-lift rods at the centre. We compared the immediate and long-term effects of VFT vs. a control training when delivered in a home-based setting. Twenty participants were randomly allocated to an intervention (who received VFT) or a control group (n = 10 each)...
January 24, 2017: Neuropsychological Rehabilitation
https://www.readbyqxmd.com/read/28039678/studying-the-neural-bases-of-prism-adaptation-using-fmri-a-technical-and-design-challenge
#10
Janet H Bultitude, Alessandro Farnè, Romeo Salemme, Danielle Ibarrola, Christian Urquizar, Jacinta O'Shea, Jacques Luauté
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...
December 30, 2016: Behavior Research Methods
https://www.readbyqxmd.com/read/27903814/blink-associated-contralateral-eccentric-saccades-as-a-rare-sign-of-unilateral-brain-injury
#11
Ilaria Zivi, Eugenio Bertelli, Giacinta Bilotti, Ignazio Alessandro Clemente, Leopold Saltuari, Giuseppe Frazzitta
OBJECTIVE: To describe a rare sign of unilateral brain injury as a form of unwanted blink-associated contralateral eccentric saccades. METHODS: A 62-year-old patient who underwent an ischemic stroke affecting the entire right middle cerebral artery territory came to our attention 1 year after stroke, manifesting with transient contralateral conjugate gaze deviations associated with spontaneous blinking. We complemented the regular neurologic evaluation with brain MRI, study of evoked potentials, electroneurography of the facial nerve, and infrared video-oculoscopy...
January 10, 2017: Neurology
https://www.readbyqxmd.com/read/27801770/dehydration-status-is-associated-with-more-severe-hemispatial-neglect-after-stroke
#12
Mona N Bahouth, Zainab Bahrainwala, Argye E Hillis, Rebecca F Gottesman
BACKGROUND: Many stroke patients are clinically dehydrated at the time of hospital presentation, which could lead to an increase in blood viscosity and alteration in cerebral perfusion. Impaired cerebral perfusion can cause hemispheric dysfunction, which can be rapidly quantified with bedside tests of hemispatial neglect. We hypothesized that hospitalized patients with laboratory markers consistent with dehydration or a volume contracted state (VCS) would have more severe cerebral dysfunction defined by greater degree of neglect...
November 2016: Neurologist
https://www.readbyqxmd.com/read/27606267/the-effect-of-an-upper-limb-rehabilitation-robot-on-hemispatial-neglect-in-stroke-patients
#13
Yoon Sik Choi, Kyeong Woo Lee, Jong Hwa Lee, Sang Beom Kim, Gyu Tae Park, Sook Joung Lee
OBJECTIVE: To investigate the effectiveness of an upper limb rehabilitation robot therapy on hemispatial neglect in stroke patients. METHODS: Patients were randomly divided into an upper limb rehabilitation robot treatment group (robot group) and a control group. The patients in the robot group received left upper limb training using an upper limb rehabilitation robot. The patients sat on the right side of the robot, so that the monitor of the robot was located on the patients' left side...
August 2016: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27543899/social-priming-of-hemispatial-neglect-affects-spatial-coding-evidence-from-the-simon-task
#14
Isabel Arend, Daniela Aisenberg, Avishai Henik
In the Simon effect (SE), choice reactions are fast if the location of the stimulus and the response correspond when stimulus location is task-irrelevant; therefore, the SE reflects the automatic processing of space. Priming of social concepts was found to affect automatic processing in the Stroop effect. We investigated whether spatial coding measured by the SE can be affected by the observer's mental state. We used two social priming manipulations of impairments: one involving spatial processing - hemispatial neglect (HN) and another involving color perception - achromatopsia (ACHM)...
October 2016: Consciousness and Cognition
https://www.readbyqxmd.com/read/27509209/the-impact-of-cortical-lesions-on-thalamo-cortical-network-dynamics-after-acute-ischaemic-stroke-a-combined-experimental-and-theoretical-study
#15
Joeri B G van Wijngaarden, Riccardo Zucca, Simon Finnigan, Paul F M J Verschure
The neocortex and thalamus provide a core substrate for perception, cognition, and action, and are interconnected through different direct and indirect pathways that maintain specific dynamics associated with functional states including wakefulness and sleep. It has been shown that a lack of excitation, or enhanced subcortical inhibition, can disrupt this system and drive thalamic nuclei into an attractor state of low-frequency bursting and further entrainment of thalamo-cortical circuits, also called thalamo-cortical dysrhythmia (TCD)...
August 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27494375/motor-versus-body-awareness-voxel-based-lesion-analysis-in-anosognosia-for-hemiplegia-and-somatoparaphrenia-following-right-hemisphere-stroke
#16
Valentina Moro, Simone Pernigo, Manos Tsakiris, Renato Avesani, Nicola M J Edelstyn, Paul M Jenkinson, Aikaterini Fotopoulou
Anosognosia for hemiplegia (AHP) is informative about the neurocognitive basis of motor awareness. However, it is frequently associated with concomitant symptoms, such as hemispatial neglect and disturbances in the sense of body ownership (DSO). Although double dissociations between these symptoms have been reported, there is ongoing debate about whether they are manifestations of independent abnormalities, or a single neurocognitive deficit. We aimed to investigate the specificity of lesions associated with AHP by surpassing four, existing methodological limitations: (a) recruit a relatively large sample of patients (total N = 70) in a multi-centre study; (b) identify lesions associated with AHP in grey and white matter using voxel-based methods; (c) take into account the duration of AHP and concomitant neglect symptoms; and (d) compare lesions against a control hemiplegic group, patients suffering from AHP and DSO, and a few, rare patients with selective DSO...
October 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/27313902/hemispatial-neglect-shows-that-before-is-left
#17
Mario Bonato, Arnaud Saj, Patrik Vuilleumier
Recent research has led to the hypothesis that events which unfold in time might be spatially represented in a left-to-right fashion, resembling writing direction. Here we studied fourteen right-hemisphere damaged patients, with or without neglect, a disorder of spatial awareness affecting contralesional (here left) space processing and representation. We reasoned that if the processing of time-ordered events is spatial in nature, it should be impaired in the presence of neglect and spared in its absence. Patients categorized events of a story as occurring before or after a central event, which acted as a temporal reference...
2016: Neural Plasticity
https://www.readbyqxmd.com/read/27277836/normalization-of-network-connectivity-in-hemispatial-neglect-recovery
#18
Lenny E Ramsey, Joshua S Siegel, Antonello Baldassarre, Nicholas V Metcalf, Kristina Zinn, Gordon L Shulman, Maurizio Corbetta
OBJECTIVE: We recently reported that spatial and nonspatial attention deficits in stroke patients with hemispatial neglect are correlated at 2 weeks postonset with widespread alterations of interhemispheric and intrahemispheric functional connectivity (FC) measured with resting-state functional magnetic resonance imaging across multiple brain networks. The mechanisms underlying neglect recovery are largely unknown. In this study, we test the hypothesis that recovery of hemispatial neglect correlates with a return of network connectivity toward a normal pattern, herein defined as "network normalization...
July 2016: Annals of Neurology
https://www.readbyqxmd.com/read/27103056/semiology-of-neglect-an-update
#19
G Rode, C Pagliari, L Huchon, Y Rossetti, L Pisella
Hemispatial neglect is a common disabling condition following brain damage to the right hemisphere. Generally, it involves behavioral bias directed ipsilaterally to the damaged hemisphere and loss of spatial awareness for the contralesional side. In this syndrome, several clinical subtypes were identified. The objective of this article is to provide a nosological analysis of the recent data from the literature on the different subtypes of neglect (visual, auditory, somatosensory, motor, egocentric, allocentric and representational neglect), associated ipsilesional and contralesional productive manifestations and their anatomical lesion correlates...
April 18, 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/26889731/functional-cerebral-space-theory-towards-an-integration-of-theory-and-mechanisms-of-left-hemineglect-anosognosia-and-anosodiaphoria
#20
Andrew J Smith, Ransom W Campbell, Patti Kelly Harrison, David W Harrison
BACKGROUND: The current case study presents a 43 year old African American woman admitted to a Tertiary Care Rehabilitation unit at a major medical center for concerns over left-sided anesthesia and weakness. Head scans indicate a right middle cerebral arterial distribution infarct altering blood flow in temporal, parietal, and occipital regions in the right cerebral hemisphere. OBJECTIVE: Physician and therapist reports (i.e., speech and occupational therapists) referred the patient for a neuropsychological evaluation for concerns over the patient's capacity to recognize the severity of her deficits and self-care, with potential rule-outs indicated by the extant literature on right CVA for anosognosia, anosodiaphoria, and left hemibody/hemispace neglect...
2016: NeuroRehabilitation
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