keyword
MENU ▼
Read by QxMD icon Read
search

Left Visual Field

keyword
https://www.readbyqxmd.com/read/28328554/the-effect-of-inlet-cannula-length-on-the-intraventricular-flow-field-an-in-vitro-flow-visualization-study-using-the-evaheart-lvad
#1
Karen May-Newman, Juyeun Moon, Varsha Ramesh, Ricardo Montes, Josue Campos, Brian Herold, Paul Isingoma, Tadashi Motomura, Robert Benkowski
LVAD inflow cannula malposition is a significant risk for pump thrombosis. Thrombus development is influenced by altered flow dynamics, such as stasis or high shear that promote coagulation. The goal of this study was to measure the intraventricular flow field surrounding the apical inflow cannula of the Evaheart centrifugal LVAD, and assess flow stasis, vortex structures and pulsatility for a range of cannula insertion depths and support conditions. Experimental studies were performed using a mock loop with a customized silicone left ventricle (LV) and the Evaheart LVAD...
March 20, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28321551/top-down-cortical-interactions-in-visuospatial-attention
#2
Timothy P Meehan, Steven L Bressler, Wei Tang, Serguei V Astafiev, Chad M Sylvester, Gordon L Shulman, Maurizio Corbetta
The voluntary allocation of visuospatial attention depends upon top-down influences from the frontal eye field (FEF) and intraparietal sulcus (IPS)-the core regions of the dorsal attention network (DAN)-to visual occipital cortex (VOC), and has been further associated with within-DAN influences, particularly from the FEF to IPS. However, the degree to which these influences manifest at rest and are then modulated during anticipatory visuospatial attention tasks remains poorly understood. Here, we measured both undirected and directed functional connectivity (UFC, DFC) between the FEF, IPS, and VOC at rest and during an anticipatory visuospatial attention task, using a slow event-related design...
March 20, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28303097/language-learning-enhanced-by-massive-multiple-online-role-playing-games-mmorpgs-and-the-underlying-behavioral-and-neural-mechanisms
#3
REVIEW
Yongjun Zhang, Hongwen Song, Xiaoming Liu, Dinghong Tang, Yue-E Chen, Xiaochu Zhang
Massive Multiple Online Role-Playing Games (MMORPGs) have increased in popularity among children, juveniles, and adults since MMORPGs' appearance in this digital age. MMORPGs can be applied to enhancing language learning, which is drawing researchers' attention from different fields and many studies have validated MMORPGs' positive effect on language learning. However, there are few studies on the underlying behavioral or neural mechanism of such effect. This paper reviews the educational application of the MMORPGs based on relevant macroscopic and microscopic studies, showing that gamers' overall language proficiency or some specific language skills can be enhanced by real-time online interaction with peers and game narratives or instructions embedded in the MMORPGs...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28296326/evaluation-of-target-and-cardiac-position-during-visually-monitored-deep-inspiration-breath-hold-for-breast-radiotherapy
#4
Leigh Conroy, Rosanna Yeung, Elizabeth Watt, Sarah Quirk, Karen Long, Alana Hudson, Tien Phan, Wendy L Smith
A low-resource visually monitored deep inspiration breath-hold (VM-DIBH) technique was successfully implemented in our clinic to reduce cardiac dose in left-sided breast radiotherapy. In this study, we retrospectively characterized the chest wall and heart positioning accuracy of VM-DIBH using cine portal images from 42 patients. Central chest wall position from field edge and in-field maximum heart distance (MHD) were manually measured on cine images and compared to the planned positions based on the digitally reconstructed radiographs (DRRs)...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28285406/leftward-oculomotor-prismatic-training-induces-a-rightward-bias-in-normal-subjects
#5
I Ronga, P Sarasso, F Raineri, J-R Duhamel, C Becchio, M Neppi-Modona
Wedge prisms shifting the visual field laterally create a mismatch between the straight ahead position signalled by vision and that encoded by extraretinal and head-on-trunk proprioceptive information. Short-term adaptation to left-deviating prisms in normal subjects results in a visuomotor attentional bias towards the right-hand side (aftereffect). Prismatic adaptation (PA) is usually induced through a training consisting in repeated ballistic movements of the dominant arm towards visual targets, while participants are wearing prismatic goggles...
March 11, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28279711/altered-saccadic-targets-when-processing-facial-expressions-under-different-attentional-and-stimulus-conditions
#6
Frank A Boutsen, Justin D Dvorak, Vinay K Pulusu, Elliott D Ross
Depending on a subject's attentional bias, robust changes in emotional perception occur when facial blends (different emotions expressed on upper/lower face) are presented tachistoscopically. If no instructions are given, subjects overwhelmingly identify the lower facial expression when blends are presented to either visual field. If asked to attend to the upper face, subjects overwhelmingly identify the upper facial expression in the left visual field but remain slightly biased to the lower facial expression in the right visual field...
March 13, 2017: Vision Research
https://www.readbyqxmd.com/read/28258660/pure-optic-ataxia-and-visual-hemiagnosia-extending-the-dual-visual-hypothesis
#7
Jurka R Meichtry, Dario Cazzoli, Silvia Chaves, Sebastian von Arx, Tobias Pflugshaupt, Roger Kalla, Claudio L Bassetti, Klemens Gutbrod, René M Müri
Goodale and Milner's two visual system hypothesis is an influential model for the understanding of the primate visual system. Lesions of either the ventral (occipito-temporal) or the dorsal (occipito-parietal) stream produce distinct and dissociated syndromes in humans: visual agnosia is typical for ventral damage, whereas optic ataxia (OA) for dorsal damage. We studied the case of a 59-year-old left-handed woman with a circumscribed lesion around the left posterior occipital sulcus, extending to the underlying white matter...
March 4, 2017: Journal of Neuropsychology
https://www.readbyqxmd.com/read/28254653/functional-connectivity-between-prefrontal-and-parietal-cortex-drives-visuo-spatial-attention-shifts
#8
Klaartje Heinen, Eva Feredoes, Christian C Ruff, Jon Driver
It is well established that the frontal eye-fields (FEF) in the dorsal attention network (DAN) guide top-down selective attention. In addition, converging evidence implies a causal role for the FEF in attention shifting, which is also known to recruit the ventral attention network (VAN) and fronto-striatal regions. To investigate the causal influence of the FEF as (part of) a central hub between these networks, we applied thetaburst transcranial magnetic stimulation (TBS) off-line, combined with functional magnetic resonance (fMRI) during a cued visuo-spatial attention shifting paradigm...
February 28, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28245497/new-rules-for-visual-selection-isolating-procedural-attention
#9
Mahalakshmi Ramamurthy, Erik Blaser
High performance in well-practiced, everyday tasks-driving, sports, gaming-suggests a kind of procedural attention that can allocate processing resources to behaviorally relevant information in an unsupervised manner. Here we show that training can lead to a new, automatic attentional selection rule that operates in the absence of bottom-up, salience-driven triggers and willful top-down selection. Taking advantage of the fact that attention modulates motion aftereffects, observers were presented with a bivectorial display with overlapping, iso-salient red and green dot fields moving to the right and left, respectively, while distracted by a demanding auditory two-back memory task...
February 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28242798/visuospatial-asymmetries-arise-from-differences-in-the-onset-time-of-perceptual-evidence-accumulation
#10
Daniel P Newman, Gerard M Loughnane, Simon P Kelly, Redmond G O'Connell, Mark A Bellgrove
Healthy subjects tend to exhibit a bias of visual attention whereby left hemifield stimuli are processed more quickly and accurately than stimuli appearing in the right hemifield. It has long been held that this phenomenon arises from the dominant role of the right cerebral hemisphere in regulating attention, however, methods that would allow for a more precise understanding of the mechanisms underpinning visuospatial bias have remained elusive. We sought to finely trace the temporal evolution of spatial biases by leveraging a novel bilateral dot motion detection paradigm...
February 27, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28240816/lateralization-of-posterior-alpha-eeg-reflects-the-distribution-of-spatial-attention-during-saccadic-reading
#11
Benthe Kornrumpf, Olaf Dimigen, Werner Sommer
Visuospatial attention is an important mechanism in reading that governs the uptake of information from foveal and parafoveal regions of the visual field. However, the spatiotemporal dynamics of how attention is allocated during eye fixations are not completely understood. The current study explored the use of EEG alpha-band oscillations to investigate the spatial distribution of attention during reading. We reanalyzed two data sets, focusing on the lateralization of alpha activity at posterior scalp sites...
February 27, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28237544/the-language-of-arithmetic-across-the-hemispheres-an-event-related-potential-investigation
#12
Danielle S Dickson, Kara D Federmeier
Arithmetic expressions, like verbal sentences, incrementally lead readers to anticipate potential appropriate completions. Existing work in the language domain has helped us understand how the two hemispheres differently participate in and contribute to the cognitive process of sentence reading, but comparatively little work has been done with mathematical equation processing. In this study, we address this gap by examining the ERP response to provided answers to simple multiplication problems, which varied both in levels of correctness (given an equation context) and in visual field of presentation (joint attention in central presentation, or biased processing to the left or right hemisphere through contralateral visual field presentation)...
February 22, 2017: Brain Research
https://www.readbyqxmd.com/read/28228312/a-study-of-coronary-artery-variants-and-anomalies-observed-at-a-tertiary-care-armed-forces-hospital-using-64-slice-mdct
#13
Akhilesh Rao, Yayati Pimpalwar, Neha Yadu, R K Yadav
BACKGROUND: Isolated coronary artery anomalies are usually clinically silent and mostly detected incidentally during angiography or autopsy. However, few of them may be implicated in cases of sudden cardiac death even in the absence of additional heart abnormalities. Prior knowledge of such variants and anomalies is necessary for planning various interventional procedures. Multiple detector computed tomography coronary angiography has proved a very useful non-invasive modality in this field given its superiority over conventional coronary angiography in providing detailed coronary artery anatomy...
January 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/28222415/young-adult-patient-with-headache-fever-and-blurred-vision
#14
Stavroula A Paschou, Konstantinos Tzioras, Vasiliki Trianti, Stavroula Lyra, Vasileios-Arsenios Lioutas, Andreas Seretis, Andromachi Vryonidou
BACKGROUND AND IMPORTANCE: This case highlights the fact that acute pituitary apoplexy may be misdiagnosed due to being confused with other entities exhibiting similar symptoms, such as meningitis or subarachnoid hemorrhage. CLINICAL PRESENTATION: A patient in his late 30s presented with sudden and severe frontal headache, fever, blurred vision, nausea, confusion, as well as oculomotor palsy (CN III) with partial ptosis of the left eyelid, dilated left pupil and left eye globe deviation inferiorly and laterally...
October 2016: Hormones: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28216520/examination-of-some-factors-affected-right-to-left-shunt-rate-and-the-normal-value-of-right-to-left-shunt-rate-in-lung-perfusion-scintigraphy
#15
Fumitoshi Nakamura, Masafumi Okabe, Takaaki Ono, Yousuke Sugimura, Naoko Muromoto, Ryou Suzuki, Taketoshi Okawada
PURPOSE: Diagnosis for right-to-left shunt was determined by the assessment of shunt-rate, which was obtained by using (99 m)Tc-macroaggregated albumin. However, it is difficult to diagnose right-to-left shunt, using the normal level of shunt-rate measured by using conventional methods. To solve this problem, we investigated ourselves the normal level of shunt-rate. METHOD: We researched 20 patients with pulmonary embolism, and they didn't have right-to-left shunt...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28214641/posterior-reversible-encephalopathy-syndrome-causing-vision-loss-following-endoscopic-endonasal-resection-of-pituitary-adenoma-a-case-report
#16
Nicolas W Villelli, Daniel M Prevedello, Daniel S Ikeda, Alaa S Montaser, Bradley A Otto, Ricardo L Carrau
BACKGROUND: Posterior Reversible Encephalopathy Syndrome (PRES) is characterized by headache, altered mental status, visual changes, and seizure combined with brain imaging consistent with cerebral edema without infarction. To the best of our knowledge, we report the first case of PRES following an endoscopic endonasal resection of a pituitary macroadenoma. CASE DESCRIPTION: A 59-year-old female was diagnosed with a pituitary macroadenoma, for which she underwent endoscopic endonasal extracapsular resection...
February 15, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28212053/transthoracic-echocardiography-pitfalls-and-limitations-as-delineated-at-cardiac-ct-and-mr-imaging
#17
Sachin B Malik, Natalie Chen, Rex A Parker, Joe Y Hsu
Transthoracic echocardiography ( TTE transthoracic echocardiography ) is a critical tool in the field of clinical cardiology. It often serves as one of the first-line imaging modalities in the evaluation of cardiac disease owing to its low cost, portability, widespread availability, lack of ionizing radiation, and ability to evaluate both anatomy and function of the heart. Consequently, a large majority of patients undergoing a cardiac computed tomography (CT) or magnetic resonance (MR) imaging examination will have a TTE transthoracic echocardiography available for review...
March 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28211206/variable-familial-exudative-vitreoretinopathy-in-a-family-harbouring-variants-in-both-fzd4-and-tspan12
#18
Patrik Schatz, Arif O Khan
PURPOSE: To report a family affected by familial exudative vitreoretinopathy (FEVR) in which more severe disease phenotypes segregated with digenic rather than monogenic variants in FEVR-related genes. METHODS: Phenotype was documented with high-resolution imaging of retinal structure and wide-field fundus photography. Next-generation sequencing (NGS) of known genes involved in FEVR was performed. RESULTS: Three affected individuals within a family with FEVR presented with variable disease severity...
February 16, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28210181/causes-of-irreversible-unilateral-or-bilateral-blindness-in-the-al-baha-region-of-the-kingdom-of-saudi-arabia
#19
Huda Farhan Alghamdi
PURPOSE: To determine the causes of irreversible unilateral and bilateral blindness that cannot be rehabilitated medically, optically nor surgically in Al Baha province, Kingdom of Saudi Arabia. METHODS: There were a retrospective chart review and examination of patients presenting to King Fahad Hospital Al Baha, Saudi Arabia, with unilateral or bilateral blindness from June 2011 to September 2011. Blindness was defined as best corrected visual acuity (BCVA) of less than 0...
July 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28205527/an-end-to-end-software-solution-for-the-analysis-of-high-throughput-single-cell-migration-data
#20
Paola Masuzzo, Lynn Huyck, Aleksandra Simiczyjew, Christophe Ampe, Lennart Martens, Marleen Van Troys
The systematic study of single-cell migration requires the availability of software for assisting data inspection, quality control and analysis. This is especially important for high-throughput experiments, where multiple biological conditions are tested in parallel. Although the field of cell migration can count on different computational tools for cell segmentation and tracking, downstream data visualization, parameter extraction and statistical analysis are still left to the user and are currently not possible within a single tool...
February 13, 2017: Scientific Reports
keyword
keyword
49887
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"