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https://www.readbyqxmd.com/read/28438131/tablets-at-the-bedside-ipad-based-visual-field-test-used-in-the-diagnosis-of-intrasellar-haemangiopericytoma-a-case-report
#1
Nisha Nesaratnam, Peter B M Thomas, Ramez Kirollos, Algis J Vingrys, George Y X Kong, Keith R Martin
BACKGROUND: In the assessment of a pituitary mass, objective visual field testing represents a valuable means of evaluating mass effect, and thus in deciding whether surgical management is warranted. CASE PRESENTATION: In this vignette, we describe a 73 year-old lady who presented with a three-week history of frontal headache, and 'blurriness' in the left side of her vision, due to a WHO grade III anaplastic haemangiopericytoma compressing the optic chiasm. We report how timely investigations, including an iPad-based visual field test (Melbourne Rapid Field, (MRF)) conducted at the bedside aided swift and appropriate management of the patient...
April 24, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28424467/the-time-course-of-spatial-attention-shifts-in-elementary-arithmetic
#2
Dixiu Liu, Danni Cai, Tom Verguts, Qi Chen
It has been proposed that elementary arithmetic induces spatial shifts of attention. However, the timing of this arithmetic-space association remains unknown. Here we investigate this issue with a target detection paradigm. Detecting targets in the right visual field was faster than in the left visual field when preceded by an addition operation, while detecting targets in the left visual field was faster than in the right visual field when preceded by a subtraction operation. The arithmetic-space association was found both at the end of the arithmetic operation and during calculation...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28418457/the-field-of-view-available-to-the-ventral-occipito-temporal-reading-circuitry
#3
Rosemary Le, Nathan Witthoft, Michal Ben-Shachar, Brian Wandell
Skilled reading requires rapidly recognizing letters and word forms; people learn this skill best for words presented in the central visual field. Measurements over the last decade have shown that when children learn to read, responses within ventral occipito-temporal cortex (VOT) become increasingly selective to word forms. We call these regions the VOT reading circuitry (VOTRC). The portion of the visual field that evokes a response in the VOTRC is called the field of view (FOV). We measured the FOV of the VOTRC and found that it is a small subset of the entire field of view available to the human visual system...
April 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28415897/electric-field-navigated-transcranial-magnetic-stimulation-for-chronic-tinnitus-a-randomized-placebo-controlled-study
#4
Hanna Sahlsten, Juuso Virtanen, Juho Joutsa, Katri Niinivirta-Joutsa, Eliisa Löyttyniemi, Reijo Johansson, Janika Paavola, Tero Taiminen, Noora Sjösten, Jaakko Salonen, Anu Holm, Esa Rauhala, Satu K Jääskeläinen
OBJECTIVE: Repetitive transcranial magnetic stimulation (rTMS) may alleviate tinnitus. We evaluated effects of electric field (E-field) navigated rTMS targeted according to tinnitus pitch. No controlled studies have investigated anatomically accurate E-field-rTMS for tinnitus. DESIGN: Effects of E-field-rTMS were evaluated in a prospective randomised placebo-controlled 6-month follow-up study on parallel groups. Patients received 10 sessions of 1 Hz rTMS or placebo targeted to the left auditory cortex corresponding to tonotopic representation of tinnitus pitch...
April 18, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28414092/numbers-and-functional-lateralization-a-visual-half-field-and-dichotic-listening-study-in-proficient-bilinguals
#5
Michal Klichowski, Gregory Króliczak
Potential links between language and numbers and the laterality of symbolic number representations in the brain are still debated. Furthermore, reports on bilingual individuals indicate that the language-number interrelationships might be quite complex. Therefore, we carried out a visual half-field (VHF) and dichotic listening (DL) study with action words and different forms of symbolic numbers used as stimuli to test the laterality of word and number processing in single-, dual-language and mixed -task and language- contexts...
April 14, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28413837/familial-exudative-vitreoretinopathy-presentation-as-persistent-fetal-vasculature
#6
Jeffrey Z Kartchner, M Elizabeth Hartnett
PURPOSE: To illustrate a presentation of familial exudative vitreoretinopathy (FEVR) that can be mistaken for unilateral persistent fetal vasculature (PFV) and the importance of wide angle fluorescein angiography in making this distinction. A patient was referred with a unilateral retrolental membrane and retinal detachment from PFV but was found to have FEVR. OBSERVATIONS: A 4 month-old full-term infant was referred with the diagnosis of PFV based on findings of a dense retrolental membrane and microphthalmia in the left eye...
June 2017: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/28396814/the-histopathological-finding-of-the-surgically-extracted-atypical-dome-shaped-choroidal-osteoma
#7
Hirona Bessho, Hisanori Imai, Atsushi Azumi
Purpose. To report a case of atypical dome-shaped choroidal osteoma, which was diagnosed by histopathological finding of surgically extracted tumor. Case Report. A 35-year-old woman presented with visual field abnormality in the left eye (OS). Her best-corrected visual acuity with Landolt ring chart was 1.0 OS. The funduscopic examination revealed a yellowish dome-shaped choroidal tumor located in the temporal side of the macula with exudative retinal detachment. 25-gauge pars plana vitrectomy and the extraction of the tumor were performed for the definitive diagnosis...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28396097/an-fmri-study-of-visual-hemifield-integration-and-cerebral-lateralization
#8
Lars Strother, Zhiheng Zhou, Alexandra K Coros, Tutis Vilis
The human brain integrates hemifield-split visual information via interhemispheric transfer. The degree to which neural circuits involved in this process behave differently during word recognition as compared to object recognition is not known. Evidence from neuroimaging (fMRI) suggests that interhemispheric transfer during word viewing converges in the left hemisphere, in two distinct brain areas, an "occipital word form area" (OWFA) and a more anterior occipitotemporal "visual word form area" (VWFA). We used a novel fMRI half-field repetition technique to test whether or not these areas also integrate nonverbal hemifield-split string stimuli of similar visual complexity...
April 7, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28395868/retinal-slippage-fold-causing-a-matching-contralateral-scotoma
#9
Jesse Gale, Keith Small
We describe a unique case in which a retinal slippage fold after right retinal detachment surgery resulted in a contralateral monocular scotoma. The scotoma in the left visual field matched the right retinal fold in visual space. This previously undescribed phenomenon could be explained by a lack of response from visual cortical neurons receiving inputs from the redundant folded retina. This may represent a top-down plasticity in the cortical retinotopic map.
April 7, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28393011/motivated-attention-and-family-risk-for-depression-neuronal-generator-patterns-at-scalp-elicited-by-lateralized-aversive-pictures-reveal-blunted-emotional-responsivity
#10
Jürgen Kayser, Craig E Tenke, Karen S Abraham, Daniel M Alschuler, Jorge E Alvarenga, Jamie Skipper, Virginia Warner, Gerard E Bruder, Myrna M Weissman
Behavioral and electrophysiologic evidence suggests that major depression (MDD) involves right parietotemporal dysfunction, a region activated by arousing affective stimuli. Building on prior event-related potential (ERP) findings (Kayser et al. 2016 NeuroImage 142:337-350), this study examined whether these abnormalities also characterize individuals at clinical high risk for MDD. We systematically explored the impact of family risk status and personal history of depression and anxiety on three distinct stages of emotional processing comprising the late positive potential (LPP)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28388668/effect-of-visual-attention-on-the-properties-of-optokinetic-nystagmus
#11
Kei Kanari, Kiyomi Sakamoto, Hirohiko Kaneko
It has been demonstrated that optokinetic nystagmus (OKN) gain increases through attention to peripheral motion when the central visual field is occluded. However, how the properties of OKN change when two areas containing motion in different directions are presented in the peripheral visual field is still unclear. In this study, we investigated whether OKN corresponding to the attended motion in the periphery occurred while the observer was maintaining fixation at the center. We presented two areas with different directions of motion arranged on the left and right, top and bottom, or center and surrounding (concentric) areas in the display...
2017: PloS One
https://www.readbyqxmd.com/read/28384671/acute-zonal-cone-photoreceptor-outer-segment-loss
#12
Tomas S Aleman, Harpal S Sandhu, Leona W Serrano, Anastasia Traband, Marisa K Lau, Grazyna Adamus, Robert A Avery
Importance: The diagnostic path presented narrows down the cause of acute vision loss to the cone photoreceptor outer segment and will refocus the search for the cause of similar currently idiopathic conditions. Objective: To describe the structural and functional associations found in a patient with acute zonal occult photoreceptor loss. Design, Setting, and Participants: A case report of an adolescent boy with acute visual field loss despite a normal fundus examination performed at a university teaching hospital...
April 6, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28379584/neural-correlates-of-the-eye-dominance-effect-in-human-face-perception-the-left-visual-field-superiority-for-faces-revisited
#13
Wookyoung Jung, Joong-Gu Kang, Hyeonjin Jeon, Miseon Shim, Ji Sun Kim, Hyun-Sung Leem, Seung-Hwan Lee
Faces are processed best when they are presented in the left visual field (LVF), a phenomenon known as LVF superiority. Although one eye contributes more when perceiving faces, it is unclear how the dominant eye (DE), the eye we unconsciously use when performing a monocular task, affects face processing. Here, we examined the influence of the DE on the LVF superiority for faces using event-related potentials. Twenty left-eye-dominant (LDE group) and 23 right-eye-dominant (RDE group) participants performed the experiments...
April 4, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28358554/attenuated-hemispheric-asymmetry-in-metaphor-processing-among-adults-with-adhd
#14
Dorit Segal, Lilach Shalev, Nira Mashal
OBJECTIVE: To characterize the hemispheric processing of metaphors in adults with ADHD compared to controls. METHOD: We investigated the hemispheric processing of metaphors in 24 adult participants diagnosed with ADHD and 24 control participants. The hemispheric processing was examined using a divided visual field paradigm, in which different kinds of metaphors as well as literal word pairs and unrelated word pairs were presented either to the right visual field/left hemisphere (RVF/LH) or to the left visual field/right hemisphere (LVF/RH)...
March 30, 2017: Neuropsychology
https://www.readbyqxmd.com/read/28356369/the-independence-of-eye-movements-in-a-stomatopod-crustacean-is-task-dependent
#15
Ilse M Daly, Martin J How, Julian C Partridge, Nicholas W Roberts
Stomatopods have an extraordinary visual system, incorporating independent movement of their eyes in all three degrees of rotational freedom. In this work, we demonstrate that in the peacock mantis shrimp, Odontodactylus scyllarus, the level of ocular independence is task dependent. During gaze stabilization in the context of optokinesis, there is weak but significant correlation between the left and right eyes in the yaw degree of rotational freedom, but not in pitch and torsion. When one eye is completely occluded, the uncovered eye does not drive the covered eye during gaze stabilization...
April 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28352205/syringomyelia-presenting-with-unilateral-optic-neuropathy-a-case-report
#16
Qi Zhe Ngoo, Evelyn Li Min Tai, Wan Hazabbah Wan Hitam
PURPOSE: In this case report, we present two cases of syringomyelia with optic neuropathy. FINDINGS: In Case 1, a 36-year-old Malay lady presented to our clinic with acute onset of blurring of vision in her left eye that she experienced since past 1 month. She was diagnosed with syringomyelia 12 years ago and was on conservative management. Her visual acuity was 6/6 in the right eye and counting fingers at 1 m in the left. There was a positive relative afferent pupillary defect in her left eye...
2017: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/28349383/right-away-a-late-right-lateralized-category-effect-complements-an-early-left-lateralized-category-effect-in-visual-search
#17
Merryn D Constable, Stefanie I Becker
According to the Sapir-Whorf hypothesis, learned semantic categories can influence early perceptual processes. A central finding in support of this view is the lateralized category effect-namely, the finding that categorically different colors (e.g., blue and green hues) can be discriminated faster than colors within the same color category (e.g., different hues of green), especially when they are presented in the right visual field. Because the right visual field projects to the left hemisphere, this finding has been popularly couched in terms of the left-lateralization of language...
March 27, 2017: Psychonomic Bulletin & Review
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
#18
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
#19
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
#20
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
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