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Spatial neglect

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https://www.readbyqxmd.com/read/28812421/right-hemispatial-ipsilesional-neglect-with-chronic-right-hemisphere-strokes
#1
John B Williamson, Damon G Lamb, D Brandon Burtis, Salsabil Haque, Eduardo M Zilli, Tigran Kesayan, Michal Harciarek, Kenneth M Heilman
BACKGROUND: Patients who present with spatial neglect after stroke often perform normally on tests for neglect after a few weeks. Whereas tests for neglect are often performed directly in front of a patient, in their actual environments many important stimuli may be present within their left or right hemispace. The presence and severity of neglect often depends on the hemisphere injured. It is possible, in chronic stroke, for spatial judgments to be influenced by an interaction of stroke laterality and the spatial location of stimuli...
August 16, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28811605/spatial-and-viewpoint-selectivity-for-others-observed-actions-in-monkey-ventral-premotor-mirror-neurons
#2
Monica Maranesi, Alessandro Livi, Luca Bonini
The spatial location and viewpoint of observed actions are closely linked in natural social settings. For example, actions observed from a subjective viewpoint necessarily occur within the observer's peripersonal space. Neurophysiological studies have shown that mirror neurons (MNs) of the monkey ventral premotor area F5 can code the spatial location of live observed actions. Furthermore, F5 MN discharge can also be modulated by the viewpoint from which filmed actions are seen. Nonetheless, whether and to what extent MNs can integrate viewpoint and spatial location of live observed actions remains unknown...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783195/murine-cutaneous-leishmaniasis-investigated-by-maldi-mass-spectrometry-imaging
#3
Fernanda Negrão, Daniele F de O Rocha, Caroline F Jaeeger, Francisca J S Rocha, Marcos N Eberlin, Selma Giorgio
Imaging mass spectrometry (IMS) is recognized as a powerful tool to investigate the spatial distribution of untargeted or targeted molecules of a wide variety of samples including tissue sections. Leishmania is a protozoan parasite that causes different clinical manifestations in mammalian hosts. Leishmaniasis is a major public health risk in different continents and represents one of the most important neglected diseases. Cutaneous lesions from mice experimentally infected with Leishmania spp. were investigated by matrix-assisted laser desorption ionization MS using the SCiLS Lab software for statistical analysis...
August 7, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28774229/what-role-for-prism-adaptation-in-the-rehabilitation-of-pure-neglect-dyslexia
#4
Radek Ptak
Prism adaptation (PA) has been successfully applied in the rehabilitation of spatial neglect, with significant transfer to classic neglect tests and activities of daily living. However, well-controlled studies were unable to replicate these findings, and recent reports suggest that PA may affect selectively visuo-motor symptoms. Here, a patient with pure left neglect dyslexia was tested before, immediately after, and 24 h after PA. Despite a significant adaptation aftereffect adaptation had no effect omissions, substitutions and letter-based errors...
August 4, 2017: Neurocase
https://www.readbyqxmd.com/read/28755239/prism-adaptation-speeds-reach-initiation-in-the-direction-of-the-prism-after-effect
#5
Christopher L Striemer, Carley A Borza
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...
July 28, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28755002/prediction-of-soil-cadmium-distribution-across-a-typical-area-of-chengdu-plain-china
#6
Qiquan Li, Changquan Wang, Tianfei Dai, Wenjiao Shi, Xin Zhang, Yi Xiao, Weiping Song, Bing Li, Yongdong Wang
A suitable method and appropriate environmental variables are important for accurately predicting heavy metal distribution in soils. However, the classical methods (e.g., ordinary kriging (OK)) have a smoothing effect that results in a tendency to neglect local variability, and the commonly used environmental variables (e.g., terrain factors) are ineffective for improving predictions across plains. Here, variables were derived from the obvious factors affecting soil cadmium (Cd), such as road traffic, and were used as auxiliary variables for a combined method (HASM_RBFNN) that was developed using high accuracy surface modelling (HASM) and radial basis function neural network (RBFNN) model...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28747903/stoichiometric-mismatch-between-consumers-and-resources-mediates-the-growth-of-rocky-intertidal-suspension-feeders
#7
Matthew E S Bracken
The concept of ecological stoichiometry-the balancing of elemental ratios in ecological interactions-has transformed our thinking about processes in natural systems. Here, this perspective is applied to rocky shore ecosystems to explore the consequences of variation in internal nutrient ratios across two trophic levels. Specifically, I measured the internal concentrations of carbon (C) and nitrogen (N) in mussels (Mytilus spp.) and particulate organic matter (POM) to evaluate the effects of stoichiometric mismatch-the difference in the carbon-to-nitrogen ratio (C:N) between a consumer and its resources-on mussel growth at sites on the coasts of Oregon, USA, and the South Island of New Zealand...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28744194/navigating-monogamy-nonapeptide-sensitivity-in-a-memory-neural-circuit-may-shape-social-behavior-and-mating-decisions
#8
REVIEW
Alexander G Ophir
The role of memory in mating systems is often neglected despite the fact that most mating systems are defined in part by how animals use space. Monogamy, for example, is usually characterized by affiliative (e.g., pairbonding) and defensive (e.g., mate guarding) behaviors, but a high degree of spatial overlap in home range use is the easiest defining feature of monogamous animals in the wild. The nonapeptides vasopressin and oxytocin have been the focus of much attention for their importance in modulating social behavior, however this work has largely overshadowed their roles in learning and memory...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28716553/regional-analysis-of-age-related-local-bone-loss-in-the-spine-of-a-healthy-population-using-3d-voxel-based-modeling
#9
Alexander Valentinitsch, Stefano Trebeschi, Eva Alarcón, Thomas Baum, Johannes Kaesmacher, Claus Zimmer, Cristian Lorenz, Jan S Kirschke
Local variations in bone loss may be of great importance to individually predict osteoporotic fractures but are neglected by current densitometry techniques. The purpose of this study was to evaluate regional variations of normal bone loss at the spine among different age groups using voxel-based morphometry. Non-contrast MDCT scans of 16 patients under the age of 40 (mean age 26years) without spinal pathology were identified as a reference cohort, where each thoracolumbar vertebra was assessed individually...
July 14, 2017: Bone
https://www.readbyqxmd.com/read/28716250/white-matter-lesions-and-cognitive-impairment-may-be-related-to-recovery-from-unilateral-spatial-neglect-after-stroke
#10
Chisako Köder Kamakura, Yuji Ueno, Yuzuru Sakai, Hisao Yoshida, Saiko Aiba, Akito Hayashi, Hideki Shimura, Katsuhiko Takeda, Keiko Kamakura, Nobutaka Hattori, Takao Urabe
BACKGROUND: Unilateral spatial neglect (USN) is frequently found in ischemic stroke patients. Because USN is related to poor functional outcomes, evaluating recovery from USN after stroke is critical. METHODS: Patients with acute ischemic stroke with lesions in the right cerebral hemisphere on MRI and exhibiting left USN were administered the Behavior Inattention Test (BIT) at 1 and 3weeks after admission. BIT improvement was defined as a ≥1-point increase in ≥4 of the 6 BIT subtests from 1 to 3weeks, or a total BIT score ≥131 at 3weeks...
August 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28704362/local-and-global-genetic-diversity-of-protozoan-parasites-spatial-distribution-of-cryptosporidium-and-giardia-genotypes
#11
Juan C Garcia-R, Nigel French, Anthony Pita, Niluka Velathanthiri, Rima Shrestha, David Hayman
Cryptosporidiosis and giardiasis are recognized as significant enteric diseases due to their long-term health effects in humans and their economic impact in agriculture and medical care. Molecular analysis is essential to identify species and genotypes causing these infectious diseases and provides a potential tool for monitoring. This study uses information on species and genetic variants to gain insights into the geographical distribution and spatial patterns of Cryptosporidium and Giardia parasites. Here, we describe the population heterogeneity of genotypic groups within Cryptosporidium and Giardia present in New Zealand using gp60 and gdh markers to compare the observed variation with other countries around the globe...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28702652/explicit-consideration-of-spatial-hydrogen-bonding-direction-for-activity-coefficient-prediction-based-on-implicit-solvation-calculations
#12
Wei-Lin Chen, Shiang-Tai Lin
The activity coefficient of a chemical in a mixture is important in understanding the thermodynamic properties and non-ideality of the mixture. The COSMO-SAC model based on the result of quantum mechanical implicit solvation calculations has been shown to provide reliable predictions of activity coefficients for mixed fluids. However, it is found that the prediction accuracy is in general inferior for associating fluids. Existing methods for describing the hydrogen-bonding interaction consider the strength of the interaction based only on the polarity of the screening charges, neglecting the fact that the formation of hydrogen bonds requires a specific orientation between the donor and acceptor pairs...
August 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28701939/behavioral-and-cortical-effects-during-attention-driven-brain-computer-interface-operations-in-spatial-neglect-a-feasibility-case-study
#13
Luca Tonin, Marco Pitteri, Robert Leeb, Huaijian Zhang, Emanuele Menegatti, Francesco Piccione, José Del R Millán
During the last years, several studies have suggested that Brain-Computer Interface (BCI) can play a critical role in the field of motor rehabilitation. In this case report, we aim to investigate the feasibility of a covert visuospatial attention (CVSA) driven BCI in three patients with left spatial neglect (SN). We hypothesize that such a BCI is able to detect attention task-specific brain patterns in SN patients and can induce significant changes in their abnormal cortical activity (α-power modulation, feature recruitment, and connectivity)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28701101/validation-of-an-immersive-virtual-reality-system-for-training-near-and-far-space-neglect-in-individuals-with-stroke-a-pilot-study
#14
Kazuhiro Yasuda, Daisuke Muroi, Masahiro Ohira, Hiroyasu Iwata
BACKGROUND: Unilateral spatial neglect (USN) is defined as impaired ability to attend and see on one side, and when present, it interferes seriously with daily life. These symptoms can exist for near and far spaces combined or independently, and it is important to provide effective intervention for near and far space neglect. OBJECTIVE: The purpose of this pilot study was to propose an immersive virtual reality (VR) rehabilitation program using a head-mounted display that is able to train both near and far space neglect, and to validate the immediate effect of the VR program in both near and far space neglect...
July 12, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28697652/ask-the-experts-how-to-treat-individuals-with-spatial-neglect-a-survey-study
#15
Peii Chen, Marco Pitteri, Glen Gillen, Harsha Ayyala
PURPOSE: Spatial neglect (SN) impedes rehabilitation success and leaves long-term consequences. We asked experts to provide their opinions in addressing SN by scenario (ideal vs. reality) and by recovery phase (earliest, acute, subacute, and chronic). Experts were individuals who have assessed or treated patients with SN clinically. MATERIALS AND METHODS: This study was conducted using an anonymous survey on the Internet with 189 responders over 3 months. Located in 23 different countries, 127 experts of seven disciplines were included (occupational therapy, physical therapy, nursing, speech and language pathology or therapy, neurology, physical medicine and rehabilitation, and psychology or neuropsychology)...
July 11, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28687287/impact-of-ct-parameters-on-the-physical-quantities-related-to-image-quality-for-two-mdct-scanners-using-the-acr-accreditation-phantom-a-phantom-study
#16
B Alikhani, L Jamali, H-J Raatschen, F Wacker, T Werncke
INTRODUCTION: To evaluate the image quality provided by MDCT scanners using an ACR phantom an to find out the relationship between CT parameters and physical quantities related to image quality. METHODS: A GE Lightspeed VCT and a GE Lightspeed Pro 16 are used. The ACR phantom consists of four modules for evaluating physical parameters. The image quality parameters, such as CT number, linearity, CNR, image uniformity, SNR and at least spatial resolution using MTF, by different sets of image acquisition protocols (IAPs) are characterized...
August 2017: Radiography
https://www.readbyqxmd.com/read/28684889/climate-change-amplifies-the-interactions-between-wind-and-bark-beetle-disturbances-in-forest-landscapes
#17
Rupert Seidl, Werner Rammer
CONTEXT: Growing evidence suggests that climate change could substantially alter forest disturbances. Interactions between individual disturbance agents are a major component of disturbance regimes, yet how interactions contribute to their climate sensitivity remains largely unknown. OBJECTIVES: Here, our aim was to assess the climate sensitivity of disturbance interactions, focusing on wind and bark beetle disturbances. METHODS: We developed a process-based model of bark beetle disturbance, integrated into the dynamic forest landscape model iLand (already including a detailed model of wind disturbance)...
July 2017: Landscape Ecology
https://www.readbyqxmd.com/read/28682260/is-implicit-motor-imagery-a-reliable-strategy-for-a-brain-computer-interface
#18
Bethel A Osuagwu, Magdalena Zych, Aleksandra Vuckovic
Explicit motor imagery (eMI) is a widely used brain computer interface (BCI) paradigm, but not everybody can accomplish this task. Here we propose a BCI based on implicit motor imagery (iMI). We compared classification accuracy between eMI and iMI of hands. Fifteen able bodied people were asked to judge the laterality of hand images presented on a computer screen in a lateral or medial orientation. This judgement task is known to require mental rotation of a person's own hands which in turn is thought to involve iMI...
June 29, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28672369/using-optic-flow-in-the-far-peripheral-field
#19
Meaghan McManus, Sarah D'Amour, Laurence R Harris
Self-motion information can be used to update spatial memory of location through an estimate of a change in position. Viewing optic flow alone can create Illusory self-motion or "vection." Early studies suggested that peripheral vision is more effective than central vision in evoking vection, but controlling for retinal area and perceived distance suggests that all retinal areas may be equally effective. However, the contributions of the far periphery, beyond 90°, have been largely neglected. Using a large-field Edgeless Graphics Geometry display (EGG, Christie, Canada, field of view ±112°) and systematically blocking central (±20° to ±90°) or peripheral (viewing through tunnels ±20° to ±40°) parts of the field, we compared the effectiveness of different retinal regions at evoking forwards linear vection...
July 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28672021/the-clinical-burden-of-human-cystic-echinococcosis-in-palestine-2010-2015
#20
Amer Al-Jawabreh, Suheir Ereqat, Kamal Dumaidi, Abdelmajeed Nasereddin, Hanan Al-Jawabreh, Kifaya Azmi, Nahed Al-Laham, Moath Nairat, Adriano Casulli, Husni Maqboul, Ziad Abdeen
BACKGROUND: Cystic echinococcosis (CE) is classified by the WHO as a neglected disease inflicting economic losses on the health systems of many countries worldwide. The aim of this case-series study was to investigate the burden of human CE in Palestine during the period between 2010 and 2015. METHODOLOGY/PRINCIPAL FINDINGS: Records of surgically confirmed CE patients from 13 public and private hospitals in the West Bank and Gaza Strip were reviewed. Patients' cysts were collected from surgical wards and formalin-fixed paraffin-embedded (FFPE) blocks were collected from histopathology departments...
July 2017: PLoS Neglected Tropical Diseases
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