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Color contrast sensitivity

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https://www.readbyqxmd.com/read/27873373/cardiac-output-and-blood-flow-redistribution-in-the-fetus-with-d-loop-transposition-of-the-great-arteries-and-intact-ventricular-septum-insights-into-the-pathophysiology
#1
Max E Godfrey, Kevin G Friedman, Monika Drogosz, Abraham M Rudolph, Wayne Tworetzky
OBJECTIVES: Although the postnatal physiology of D-loop transposition of the great arteries with intact ventricular septum (DTGA-IVS) is well established, little is known about fetal DTGA-IVS. In the normal fetus, the pulmonary valve (PV) is larger than the aortic valve (AoV), there is exclusive right to left flow at the foramen ovale (FO) and ductus arteriosus (DA), and the left ventricle (LV) ejects 40% of combined ventricular output (CVO) through the aorta, primarily to the brain. In DTGA-IVS, the LV ejects O2 -rich blood to the pulmonary artery, theoretically leading to pulmonary vasodilation, increased branch pulmonary arterial flow and reduced DA flow...
November 22, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27872754/evaluation-of-contrast-sensitivity-chromatic-vision-and-reading-ability-in-patients-with-primary-open-angle-glaucoma
#2
Maria P Bambo, Blanca Ferrandez, Noemi Güerri, Isabel Fuertes, Beatriz Cameo, Vicente Polo, Jose M Larrosa, Elena Garcia-Martin
Purpose. To compare contrast sensitivity, acquired color vision deficiency, and reading ability in patients with glaucoma at different stages of the disease and to establish correlations between visual field parameters and visual function scores. Methods. This prospective cross-sectional study included 121 glaucoma patients. Subjects with a diagnosis of chronic open angle glaucoma were recruited and classified according to Hodapp-Parrish-Anderson criteria. Patients with severe visual field defects were excluded because they were older, which could bias the interpretation of visual function tests...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27851900/residual-perception-of-biological-motion-in-cortical-blindness
#3
Ruffieux Nicolas, Ramon Meike, Lao Junpeng, Colombo Françoise, Stacchi Lisa, Borruat François-Xavier, Accolla Ettore, Annoni Jean-Marie, Caldara Roberto
From birth, the human visual system shows a remarkable sensitivity for perceiving biological motion. This visual ability relies on a distributed network of brain regions and can be preserved even after damage of high-level ventral visual areas. However, it remains unknown whether this critical biological skill can withstand the loss of vision following bilateral striate damage. To address this question, we tested the categorization of human and animal biological motion in BC, a rare case of cortical blindness after anoxia-induced bilateral striate damage...
November 13, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27829050/high-resolution-ultrasound-switchable-fluorescence-imaging-in-centimeter-deep-tissue-phantoms-with-high-signal-to-noise-ratio-and-high-sensitivity-via-novel-contrast-agents
#4
Bingbing Cheng, Venugopal Bandi, Ming-Yuan Wei, Yanbo Pei, Francis D'Souza, Kytai T Nguyen, Yi Hong, Baohong Yuan
For many years, investigators have sought after high-resolution fluorescence imaging in centimeter-deep tissue because many interesting in vivo phenomena-such as the presence of immune system cells, tumor angiogenesis, and metastasis-may be located deep in tissue. Previously, we developed a new imaging technique to achieve high spatial resolution in sub-centimeter deep tissue phantoms named continuous-wave ultrasound-switchable fluorescence (CW-USF). The principle is to use a focused ultrasound wave to externally and locally switch on and off the fluorophore emission from a small volume (close to ultrasound focal volume)...
2016: PloS One
https://www.readbyqxmd.com/read/27828102/perifoveal-l-and-m-cone-driven-temporal-contrast-sensitivities-at-different-retinal-illuminances
#5
Cord Huchzermeyer, Jan Kremers
We established a protocol using a well-established LED stimulator to measure temporal contrast sensitivities driven by sine-wave modulation of L- and M-cones in the perifovea using triple silent substitution. The stimulus was presented in an annular field (2° inner diameter, 13° outer diameter). We validated this technique by studying the contrast sensitivity of three color normal observers at 10 different temporal frequencies (between 1 and 28 Hz) over a large range of retinal illuminances (between 0.07 and 587 phot Td), spanning the complete mesopic range...
October 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/27813519/comparison-of-vision-related-quality-of-life-in-primary-open-angle-glaucoma-and-dry-type-age-related-macular-degeneration
#6
S Karadeniz Ugurlu, A E Kocakaya Altundal, M Altin Ekin
PurposeTo compare quality of life (QoL) in patients with primary open-angle glaucoma (POAG) and dry-type age-related macular degeneration (AMD) with similar best-corrected visual acuity.MethodsAge-, sex-, and visual acuity-matched POAG and dry AMD patients were included in the study. Each patient performed 24-2 and 10-2 SITA standard visual field tests. Contrast sensitivity was evaluated with CSV-1000 HGT instrument. The 25 item National Eye Institute Visual Function Questionnaire (NEI-VFQ-25) was used to analyze QoL...
November 4, 2016: Eye
https://www.readbyqxmd.com/read/27794166/a-new-procedure-for-a-fast-soft-staining-of-bn-pages-on-photosynthetic-complexes
#7
Domenica Farci, Joanna Kirkpatrick, Dario Piano
We report a fast and sensitive procedure for Blue Native PAGE staining, in which the conventional staining step with Coomassie Brilliant Blue is avoided. After running, a short exposure to a mix of polar protic solvents (ethanol and acetic acid) leads to a fast and selective removal of the dye from the migration front and a specific binding to the protein bands, while the rest undergo a selective and complete background removal, leading to an intense contrast. This single step staining-destaining technique is useful in protein samples that bind colored cofactors such as photosystems, which can be selectively discerned by their characteristic green color...
October 29, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27789946/real-time-colorimetric-detection-of-dna-methylation-of-the-pax1-gene-in-cervical-scrapings-for-cervical-cancer-screening-with-thiol-labeled-pcr-primers-and-gold-nanoparticles
#8
Jin Huang, Yu-Ligh Liou, Ya-Nan Kang, Zhi-Rong Tan, Ming-Jing Peng, Hong-Hao Zhou
BACKGROUND: DNA methylation can induce carcinogenesis by silencing key tumor suppressor genes. Analysis of aberrant methylation of tumor suppressor genes can be used as a prognostic and predictive biomarker for cancer. In this study, we propose a colorimetric method for the detection of DNA methylation of the paired box gene 1 (PAX1) gene in cervical scrapings obtained from 42 patients who underwent cervical colposcopic biopsy. METHODS: A thiolated methylation-specific polymerase chain reaction (MSP) primer was used to generate MSP products labeled with the thiol group at one end...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27773657/contrast-dependence-of-saccadic-blanking-and-landmark-effects
#9
Kazumichi Matsumiya, Masayuki Sato, Satoshi Shioiri
Two phenomena have been reported to affect the perceived displacement of a visual target during saccadic eye movements: the blanking effect and landmark effect. In the blanking effect, temporarily blanking the target after a saccade improves displacement judgments. In the landmark effect, illusory target displacement occurs when a continuously presented landmark is displaced during a saccade, and the target is temporarily blanked after the saccade without displacement. We show that the strengths of the blanking and landmark effects vary with stimulus contrast...
December 2016: Vision Research
https://www.readbyqxmd.com/read/27767982/intrasurgical-dignity-assessment-of%C3%A2-hepatic%C3%A2-tumors-using-semi-quantitative-strain-elastography-and-contrast-enhanced-ultrasound-for-optimisation-of-liver-tumor%C3%A2-surgery
#10
N Platz Batista da Silva, M Schauer, M Hornung, S Lang, L P Beyer, I Wiesinger, C Stroszczynski, E M Jung
OBJECTIVE: To evaluate the efficacy of strain elastography (SE) using semi-quantitative measurement methods compared to constrast enhanced ultrasound during liver tumor surgery (Io-CEUS) for dignity assessment of focal liver lesions(FLL). MATERIAL AND METHODS: Prospective data acquisition and retrospective analysis of US data of 100 patients (116 lesions) who underwent liver tumor surgery between 10/2010 and 03/2016. Retrospective reading of SE color patterns was performed establishing groups depending on dominant color (>50% blue = stiff, inhomogenous, >50% yellow/red/green = soft tissue)...
October 20, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27742131/impaired-contrast-sensitivity-is-associated-with-more-severe-cognitive-impairment-in-parkinson-disease
#11
A Ridder, M L T M Müller, V Kotagal, K A Frey, R L Albin, N I Bohnen
OBJECTIVES: Dopaminergic degeneration affects both nigrostriatal projection neurons and retinal amacrine cells in Parkinson disease (PD). Parkinsonian retinopathy is associated with impaired color discrimination and contrast sensitivity. Some prior studies described associations between color discrimination deficits and cognitive deficits in PD, suggesting that contrast discrimination deficits are due, at least in part, to cognitive deficits in PD. We investigated the relationship between cognitive deficits and impaired contrast sensitivity in PD...
October 7, 2016: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/27688970/blue-hypertext-is-a-good-design-decision-no-perceptual-disadvantage-in-reading-and-successful-highlighting-of-relevant-information
#12
Benjamin Gagl
BACKGROUND: Highlighted text in the Internet (i.e., hypertext) is predominantly blue and underlined. The perceptibility of these hypertext characteristics was heavily questioned by applied research and empirical tests resulted in inconclusive results. The ability to recognize blue text in foveal and parafoveal vision was identified as potentially constrained by the low number of foveally centered blue light sensitive retinal cells. The present study investigates if foveal and parafoveal perceptibility of blue hypertext is reduced in comparison to normal black text during reading...
2016: PeerJ
https://www.readbyqxmd.com/read/27676614/the-contribution-of-object-shape-and-surface-properties-to-object-ensemble-representation-in-anterior-medial-ventral-visual-cortex
#13
Jonathan S Cant, Yaoda Xu
Our visual system can extract summary statistics from large collections of objects without forming detailed representations of the individual objects in the ensemble. In a region in ventral visual cortex encompassing the collateral sulcus and the parahippocampal gyrus and overlapping extensively with the scene-selective parahippocampal place area (PPA), we have previously reported fMRI adaptation to object ensembles when ensemble statistics repeated, even when local image features differed across images (e...
September 27, 2016: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/27671455/color-doppler-ultrasound-with-superb-microvascular-imaging-smi-compared-to-contrast-enhanced-ultrasound-ceus-and-ct-angiography-to-identify-and-classify-endoleaks-in-patients-undergoing-evar
#14
Vito Cantisani, Emanuele David, Donatella Ferrari, Fabrizio Fanelli, Luca Di Marzo, Carlo Catalano, Filippo Benedetto, Domenico Spinelli, Athanasios Katsargyris, Alfredo Blandino, Giorgio Ascenti, Ferdinando D'Ambrosio
OBJECTIVE: To evaluate the diagnostic effectiveness of color-Doppler ultrasound with Superb Microvascular Imaging (SMI) compared to ultrasound with contrast agent (CEUS), CT multi-slice angiography (64 slices) and angiography required for therapeutic reasons, for follow-up after endovascular aneurysm repair (EVAR) MATERIALS AND METHODS: from March 2014 to May 2015, 57 patients treated with EVAR were evaluated with CT, CEUS, CDUS, SMI and angiography in cases requiring treatment. Evaluation included sac diameter, stent-graft integrity, identification and classification of endoleaks...
September 23, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27641243/linked-color-imaging-application-for-improving-the-endoscopic-diagnosis-accuracy-a-pilot-study
#15
Xiaotian Sun, Tenghui Dong, Yiliang Bi, Min Min, Wei Shen, Yang Xu, Yan Liu
Endoscopy has been widely used in diagnosing gastrointestinal mucosal lesions. However, there are still lack of objective endoscopic criteria. Linked color imaging (LCI) is newly developed endoscopic technique which enhances color contrast. Thus, we investigated the clinical application of LCI and further analyzed pixel brightness for RGB color model. All the lesions were observed by white light endoscopy (WLE), LCI and blue laser imaging (BLI). Matlab software was used to calculate pixel brightness for red (R), green (G) and blue color (B)...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27633241/effect-of-color-temperature-on-melatonin-production-for-illumination-of-working-environments
#16
Anja Kraneburg, Steffen Franke, Ralf Methling, Barbara Griefahn
UNLABELLED: We studied the influence of correlated color temperature (CCT) of 7 polychromatic white light illuminations (1600 K-14,000 K, 200 lx) in two experiments. Visual performance was tested in 17 students (8 men) during daytime. Visual acuity, contrast sensitivity and sleepiness did not vary with illuminations but polychromatic white light of <2000 K impaired color discrimination. Melatonin synthesis was tested with weekly intervals in 8 trials from 10pm to 2am (7 polychromatic illuminations and a dim light reference (<0...
January 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27603676/use-of-digitally-stained-multimodal-confocal-mosaic-images-to-screen-for-nonmelanoma-skin-cancer
#17
Euphemia W Mu, Jesse M Lewin, Mary L Stevenson, Shane A Meehan, John A Carucci, Daniel S Gareau
Importance: Confocal microscopy has the potential to provide rapid bedside pathologic analysis, but clinical adoption has been limited in part by the need for physician retraining to interpret grayscale images. Digitally stained confocal mosaics (DSCMs) mimic the colors of routine histologic specimens and may increase adaptability of this technology. Objective: To evaluate the accuracy and precision of 3 physicians using DSCMs before and after training to detect basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) in Mohs micrographic surgery fresh-tissue specimens...
September 7, 2016: JAMA Dermatology
https://www.readbyqxmd.com/read/27595132/representation-of-perceptual-color-space-in-macaque-posterior-inferior-temporal-cortex-the-v4-complex
#18
Kaitlin S Bohon, Katherine L Hermann, Thorsten Hansen, Bevil R Conway
The lateral geniculate nucleus is thought to represent color using two populations of cone-opponent neurons [L vs M; S vs (L + M)], which establish the cardinal directions in color space (reddish vs cyan; lavender vs lime). How is this representation transformed to bring about color perception? Prior work implicates populations of glob cells in posterior inferior temporal cortex (PIT; the V4 complex), but the correspondence between the neural representation of color in PIT/V4 complex and the organization of perceptual color space is unclear...
July 2016: ENeuro
https://www.readbyqxmd.com/read/27591308/vision-on-the-high-seas-spatial-resolution-and-optical-sensitivity-in-two-procellariiform-seabirds-with-different-foraging-strategies
#19
Mindaugas Mitkus, Gabrielle A Nevitt, Johannis Danielsen, Almut Kelber
Procellariiform or 'tubenosed' seabirds are challenged to find prey and orient over the seemingly featureless oceans. Previous studies have found that life history strategy (burrow vs. surface nesting) was correlated to foraging strategy. Burrow nesters tended to track prey using dimethyl sulphide (DMS), a compound associated with phytoplankton, whereas surface-nesting species did not. Burrow nesters also tended to be smaller and more cryptic, whereas surface nesters were larger with contrasting plumage coloration...
September 2, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27580077/blue-black-or-white-gold-early-stage-processing-and-the-color-of-the-dress
#20
Jeff Rabin, Brook Houser, Carolyn Talbert, Ruh Patel
PURPOSE: In Feb 2015 an image of a dress posted on Tumblr triggered an internet phenomenon: Is the Dress blue and black (BB) or white and gold (WG)? Many claim BB and others insist WG while the true colors are BB. The prevailing theory is that assumptions about the illuminant govern perception of the Dress with WG due to bluish lighting and BB due to yellowish. Our purpose was to determine if early stage optical, retinal and/or neural factors also impact perception of the Dress. METHODS: Thirty-nine subjects were categorized as BB or WG based on their initial perception of the Dress and their perception reported when viewing the Dress on iPhone 5, iPad, and 22" LCD displays...
2016: PloS One
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