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Left Visual Field

Edouard Mazerand, Marc Le Renard, Sophie Hue, Jean-Michel Lemee, Evelyne Klinger, Philippe Menei
BACKGROUND: Brain mapping during awake craniotomy is a well-known technique to preserve neurological functions, especially the language. It is still challenging to map the optic radiations due to the difficulty to test the visual field intraoperatively. OBJECTIVE: To assess the visual field during awake craniotomy, we developed the Functions' Explorer based on a Virtual Reality Headset (FEX-VRH). METHODS: The impaired visual field of ten patients was tested with the gold standard exam (an automated perimetry), and the FEX-VRH...
October 15, 2016: World Neurosurgery
Giulia Prete, Mara Fabri, Nicoletta Foschi, Luca Tommasi
We investigated hemispheric asymmetries in categorization of face gender by means of a divided visual field paradigm, in which female and male faces were presented unilaterally for 150 ms each. A group of 60 healthy participants (30 males) and a male split-brain patient (D.D.C.) were asked to categorize the gender of the stimuli. Healthy participants categorized male faces presented in the right visual field (RVF) better and faster than when presented in the left visual field (LVF), and female faces presented in the LVF than in the RVF, independently of the participants' sex...
October 13, 2016: Neuroscience
Mustafa Özçetin, Mehmet Karacı, Ertuğ Toroslu, Nurullah Edebali
Pituitary adenomas usually arise from the anterior lobe of the pituitary gland and are manifested with hormonal disorders or mass effect. Mass effect usually occurs in nonfunctional tumors. Pituitary adenomas may be manifested with visual field defects or rarely in the form of total oculomotor palsy. Visual field defect is most frequently in the form of bitemporal hemianopsia and superior temporal defect. Sudden loss of vision, papilledema and ophthalmoplegia may be observed. Pituitary apoplexy is defined as an acute clinical syndrome characterized with headache, vomiting, loss of vision, ophthalmoplegia and clouding of consciousness...
September 2016: Türk Pediatri Arşivi
Aminda J O'Hare, Ruth Ann Atchley, Keith M Young
The motivated attention network is believed to be the system that allocates attention toward motivationally relevant, emotional stimuli in order to better prepare an organism for action [Lang, P. J., Bradley, M. M., & Cuthbert, B. N. (1997). Motivated attention: Affect, activation, and action. In P. J. Lang, R. F. Simons, M. Balaban, & R. Simons (Eds.), Attention and orienting: Sensory and motivational processes (pp. 97-135). Psychology Press]. The late positive potential (LPP), an event-related potential (ERP) that is a manifestation of the motivated attention network, has not been found to reliably differentiate the valence of emotionally relevant stimuli...
October 12, 2016: Laterality
Bernhard J Haubner, Thomas Schuetz, Josef M Penninger
Cardiac regeneration is one of the prime visions in cardiovascular research. The mouse neonatal apical resection and left anterior descending artery (LAD) ligation model introduced novel in vivo mammalian assays to study cardiac regeneration. However, recent reports and editorials discussed and critically questioned the value and technical reproducibility of the mouse neonatal myocardial infarction approach, making it paramount to develop and use a reproducible model system. We established a mouse neonatal myocardial infarction model by visually confirmed ligation of the LAD using microsurgery...
November 2016: Basic Research in Cardiology
Wei Zhou, Eric R Muir, Steven Chalfin, Kundandeep S Nagi, Timothy Q Duong
PURPOSE OF THE STUDY: The purpose of the study was to evaluate neurodegeneration along brain visual pathways in primary open angle glaucoma (POAG) using improved analysis methods of volumetric and diffusion tensor magnetic resonance imaging (MRI) data. METHODS: Eleven POAG patients (60.0±9.2 y) with primarily mild to moderate POAG and 11 age-matched controls (55.9±7.5 y) were studied using structural and diffusion tensor MRI. Surface-based segmentation was applied to structural MRI to obtain visual cortical area and volume...
September 21, 2016: Journal of Glaucoma
Peter Leinen, Stefan Panzer, Charles H Shea
Two experiments utilizing a spatial-temporal movement sequence were designed to determine if the memory of the sequence is lateralized in the left or right hemisphere. In Experiment 1, dominant right-handers were randomly assigned to one of two acquisition groups: a left-hand starter and a right-hand starter group. After an acquisition phase, reaction time (RT) was measured in a recognition test by providing the learned sequential pattern in the left or right visual half-field for 150ms. In a retention test and two transfer tests the dominant coordinate system for sequence production was evaluated...
September 17, 2016: Acta Psychologica
M El-Husseiny, L Daas, A Viestenz, A Langenbucher, B Seitz
BACKGROUND AND PURPOSE: The KAMRA™ inlay (AcuFocus, Irvine, California, USA) is an additional option for correcting presbyopia that has been used for many years in refractive surgery. Our objective is to report our three-month postoperative results of KAMRA™ inlay implantation in terms of near, intermediate and distance vision. PATIENTS AND METHODS: All 24 patients (average age 54.1 ± 6.0 years) were treated with the KAMRA™ inlay in the non-dominant eye (75 % in the left eye) by the same surgeon (MEH)...
September 8, 2016: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
Kamila Śmigasiewicz, Gabriel Sami Hasan, Rolf Verleger
In dynamically changing environments, spatial attention is not equally distributed across the visual field. For instance, when two streams of stimuli are presented left and right, the second target (T2) is better identified in the left visual field (LVF) than in the right visual field (RVF). Recently, it has been shown that this bias is related to weaker stimulus-driven orienting of attention toward the RVF: The RVF disadvantage was reduced with salient task-irrelevant valid cues and increased with invalid cues...
September 14, 2016: Journal of Cognitive Neuroscience
Peyman Petramfar, Farideh Hosseinzadeh, S Saeed Mohammadi
INTRODUCTION: Pseudo-Foster Kennedy syndrome is a triad consisting of ipsilateral optic atrophy, contralateral optic disc edema, and ipsilateral anosmia in the absence of an intracranial mass. Vitamin B12 plays an important role in DNA synthesis, and its deficiency causes peripheral neuropathy, myeloneuropathy, and, very rarely, optic neuropathy. CASE PRESENTATION: In this study, we describe a 34-year-old male who presented with progressive loss of visual acuity and field...
June 2016: Iranian Red Crescent Medical Journal
Katherine A DeLong, Marta Kutas
With a growing literature demonstrating the predictive nature of language processing, the current study examines contributions of the brain's two hemispheres in processing more and less probable sentence continuations. Specifically, we use the ERP method in conjunction with the visual half-field paradigm to test for hemispheric utilization of sentential constraint to (pre-)activate lexical information and resolve meaning. Taking advantage of the N400's semantic sensitivities, we find support for both hemispheres exhibiting remarkably similar involvement, across a range of message level constraint, in meaning construction...
September 5, 2016: Neuropsychologia
Chuhan Li, Min Wang, Ping Yang, Xianxian Kong, Ling Li
We examined the influence of spatial selective attention on the processing of emotional faces (happy neutral, and fear) using behavioral as well as event-related potential recordings. Emotional stimuli were rapidly presented randomly to the right or the left visual field while participants attended to one visual field at a time, detecting smaller stimuli that were shown in the attended field. Behavioral results showed decreased accuracy for the fearful faces compared with neutral and happy faces. Event-related potential data showed that compared with the neutral and happy faces, fearful faces appearing in the right visual field elicited enhanced contralateral P1 amplitudes in the unattended condition, whereas fearful faces appearing in the left visual field elicited decreased contralateral N170 activity in the attended condition...
November 9, 2016: Neuroreport
Afra M Wohlschläger, Sarah Glim, Junming Shao, Johanna Draheim, Lina Köhler, Susana Lourenço, Valentin Riedl, Christian Sorg
The human brain's ongoing activity is characterized by intrinsic networks of coherent fluctuations, measured for example with correlated functional magnetic resonance imaging signals. So far, however, the brain processes underlying this ongoing blood oxygenation level dependent (BOLD) signal orchestration and their direct relevance for human behavior are not sufficiently understood. In this study, we address the question of whether and how ongoing BOLD activity within intrinsic occipital networks impacts on conscious visual perception...
2016: Frontiers in Human Neuroscience
Alina Livshits, Jelena Kravarusic, Ellie Chuang, Mark E Molitch
PURPOSE: The objective of this case report is to demonstrate that the simple expedient of measuring periodic prolactin levels in patients with MEN1 who have modest hyperprolactinemia and normal pituitary MRI scans is insufficient to monitor for the development of pituitary adenomas. METHODS: Review of relevant literature and chart review. RESULTS: A 25 year old man with known MEN1 manifested by hyperparathyroidism and a gastrin-producing neuroendocrine tumor was found to have a prolactin [PRL] level of 20...
September 6, 2016: Pituitary
Matthew T Bender, Li-Mei Lin, Geoffrey P Colby, Daniel Lubelski, Judy Huang, Rafael J Tamargo, Alexander L Coon
INTRODUCTION: Recent reports suggest that thromboembolic complications are associated with Pipeline embolization device (PED) placement cluster in P2Y12 hyporesponders. OBJECTIVE: To evaluate the role of P2Y12 hyporesponse in PED placement by retrospectively reviewing a single-center series of patients. METHODS: We retrospectively reviewed an institutional review board-approved database of patients with an aneurysm at a single institution and identified all patients with a measured P2Y12 reaction unit (PRU)>200 who had undergone anterior circulation PED placement...
September 6, 2016: Journal of Neurointerventional Surgery
Woncheol Jang, Joon-Ho Shin, Mingyu Kim, Kwanguk Kenny Kim
BACKGROUND AND OBJECTIVE: Human field of regard (FOR) is an important concept that should be considered along with field of view (FOV) for people with/without handicaps, but previous studies have neglected this aspect of human perception. In the current study, we suggest and test a new virtual reality (VR) software with which to evaluate individual's detection abilities in the human FOR. METHODS: We conducted measurements of human FOV, FOR, and FOR with visual cue (FOR-cue), and we evaluated healthy adults' responses in a first experiment...
October 2016: Computer Methods and Programs in Biomedicine
Robert C Sergott, Chris A Johnson, Kenneth D Laxer, Robert T Wechsler, Katya Cherny, JoAnn Whittle, Ge Feng, Deborah Lee, Jouko Isojarvi
OBJECTIVE: Evaluate visual-field and retinal-structure changes following adjunctive vigabatrin treatment in vigabatrin-naive adults with refractory complex partial seizures (rCPS). METHODS: Prospective, longitudinal, single-arm, open-label study (NCT01278173). Eligible patients (≥2 seizures/month who failed ≥3 therapies) who could reliably perform perimetry (Humphrey automated static) and retinal-structure assessment (spectral-domain optical coherence tomography) prior to vigabatrin exposure...
October 2016: Epilepsia
William W Sprague, Emily A Cooper, Sylvain Reissier, Baladitya Yellapragada, Martin S Banks
Blur from defocus can be both useful and detrimental for visual perception: It can be useful as a source of depth information and detrimental because it degrades image quality. We examined these aspects of blur by measuring the natural statistics of defocus blur across the visual field. Participants wore an eye-and-scene tracker that measured gaze direction, pupil diameter, and scene distances as they performed everyday tasks. We found that blur magnitude increases with increasing eccentricity. There is a vertical gradient in the distances that generate defocus blur: Blur below the fovea is generally due to scene points nearer than fixation; blur above the fovea is mostly due to points farther than fixation...
August 1, 2016: Journal of Vision
Kevin E Houston, A M Barrett
PURPOSE: Patching for double vision is a common palliative treatment for head-trauma patients with acquired strabismus when prisms are not feasible. METHODS: We review literature on spatial neglect and discuss possible effects of monocular occlusion on spatial attention. RESULTS: Patching the left eye has been shown to worsen spatial judgments in some brain-injured patients with left neglect by inhibiting the right superior colliculus further impairing contralateral leftward orienting (the Sprague Effect)...
August 30, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Maxwell Elia, Ninani Kombo, John Huang
PURPOSE: To report a case of neurosarcoidosis with an isolated brain lesion mimicking a low-grade glioma. METHODS: A 38-year-old woman presented with 2 weeks of blurry vision in the left eye. Ophthalmic examination, visual field testing, fluorescein angiography, laboratory testing, and MRI of the brain were performed. RESULTS: Ophthalmic examination revealed left-sided optic nerve infiltration, and MRI of the brain demonstrated a solitary lesion in the brain...
August 26, 2016: Retinal Cases & Brief Reports
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