keyword
MENU ▼
Read by QxMD icon Read
search

Color vision

keyword
https://www.readbyqxmd.com/read/29146465/more-than-blindsight-case-report-of-a-child-with-extraordinary-visual-capacity-following-perinatal-bilateral-occipital-lobe-injury
#1
Inaki-Carril Mundinano, Juan Chen, Mitchell de Souza, Marc G Sarossy, Marc F Joanisse, Melvyn A Goodale, James A Bourne
Injury to the primary visual cortex (V1, striate cortex) and the geniculostriate pathway in adults results in cortical blindness, abolishing conscious visual perception. Early studies by Larry Weiskrantz and colleagues demonstrated that some patients with an occipital-lobe injury exhibited a degree of unconscious vision and visually-guided behaviour within the blind field. A more recent focus has been the observed phenomenon whereby early-life injury to V1 often results in the preservation of visual perception in both monkeys and humans...
November 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29146319/developing-a-machine-vision-system-for-simultaneous-prediction-of-freshness-indicators-based-on-tilapia-oreochromis-niloticus-pupil-and-gill-color-during-storage-at-4%C3%A2-c
#2
Ce Shi, Jianping Qian, Shuai Han, Beilei Fan, Xinting Yang, Xiaoming Wu
The study assessed the feasibility of developing a machine vision system based on pupil and gill color changes in tilapia for simultaneous prediction of total volatile basic nitrogen (TVB-N), thiobarbituric acid (TBA) and total viable counts (TVC) during storage at 4°C. The pupils and gills were chosen and color space conversion among RGB, HSI and L(∗)a(∗)b(∗) color spaces was performed automatically by an image processing algorithm. Multiple regression models were established by correlating pupil and gill color parameters with TVB-N, TVC and TBA (R(2)=0...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29143248/what-do-dogs-canis-familiaris-see-a-review-of-vision-in-dogs-and-implications-for-cognition-research
#3
Sarah-Elizabeth Byosiere, Philippe A Chouinard, Tiffani J Howell, Pauleen C Bennett
Over the last 20 years, a large amount of research has been conducted in an attempt to uncover the cognitive abilities of the domestic dog. While substantial advancements have been made, progress has been impeded by the fact that little is known about how dogs visually perceive their external environment. It is imperative that future research determines more precisely canine visual processing capabilities, particularly considering the increasing number of studies assessing cognition via paradigms requiring vision...
November 15, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/29143216/self-perception-and-determinants-of-color-vision-in-parkinson-s-disease
#4
Alexander U Brandt, Hanna G Zimmermann, Timm Oberwahrenbrock, Justine Isensee, Thomas Müller, Friedemann Paul
Visual dysfunction is common in patients with Parkinson's disease (PD). The objective of this study was to investigate the perceived impact of visual dysfunction and especially color vision loss on PD patients, and to identify retinal and disease factors associated with color vision. Thirty PD patients and thirty-four healthy controls were included. Participants performed the Farnsworth-Munsell Hue-100 test (FMT). Patients answered the National Eye Institute Visual Function Questionnaire (NEI-VFQ), Unified Parkinson's Disease Rating Scale (UPDRS) assessment, and underwent optical coherence tomography with measurement of retinal nerve fiber layer, ganglion cell layer + inner plexiform layer (GCIPL), and outer nuclear and photoreceptor layer...
November 15, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29139068/minor-corral-changes-and-adoption-of-good-handling-practices-can-improve-the-behavior-and-reduce-cortisol-release-in-nellore-cows
#5
Maria Lúcia Pereira Lima, João Alberto Negrão, Claudia Cristina Paro de Paz, Temple Grandin
Inadequate corral facilities and improper handling are major causes of stress in beef cattle. The purpose of this study was to evaluate the effects of minor changes in the corral and adoption of good handling practices on the behavior, cortisol release, and time spent taking blood samples in Nellore cows. Minor corral changes included obstructing the cow's vision when the handler walked deep into the animal's flight zone and the elimination of bright objects, color contrasts, puddles, shadows, and darkness in the corral...
November 14, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/29137569/the-neuro-ophthalmological-effects-related-to-long-term-occupational-exposure-to-organic-solvents-in-painters
#6
Heba Khodary Allam, Shaimaa Soliman, Tamer Wasfy, Ahmed Ghoneim, Yasser Serag, Grace Simbajwe
PURPOSE: Organic solvents are widely used in many industries, and usually, exposure occurs with mixtures of solvents. Organic solvent mixtures are known for their ability to affect tissues of high lipid content including the myelin sheath in the nervous system. The purpose of this work was to study the evidence that long-term (more than 10 years) exposure to organic solvent mixtures among painters can induce neuro-ophthalmological effects on the function of retinal ganglion cells and the optic tract...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29137026/implantation-of-artificialiris-a-customflex-irisprosthesis-in-a-trauma-patient-with-an-artisan-lens-a-case-report-and-review
#7
Farideh Doroodgar, Mahmoud Jabbarvand, Feizollah Niazi, Sana Niazi, Azad Sanginabadi
PURPOSE: To evaluate probable complications of ArtificialIris implantation with iris fixated intraocular lens. METHOD: Development of photophobia, glare, and psychological strain during face-to-face communication in a 23-year-old man with a widespread traumatic iris defect terminate to make a decision for performing implantation of an ArtificialIris (Humanoptics, Erlangen, Germany) under the remnant iris without removing the patient's existing Artisan lens. RESULTS: Without any intraoperative or postoperative complications, the patient's visual acuity increased by 1 line, the endothelial cell loss was comparable with the cell loss associated with standard cataract surgery, and the anterior-chamber depth and anterior-chamber anatomy did not change...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29134201/pushing-the-limits-of-photoreception-in-twilight-conditions-the-rod-like-cone-retina-of-the-deep-sea-pearlsides
#8
Fanny de Busserolles, Fabio Cortesi, Jon Vidar Helvik, Wayne I L Davies, Rachel M Templin, Robert K P Sullivan, Craig T Michell, Jessica K Mountford, Shaun P Collin, Xabier Irigoien, Stein Kaartvedt, Justin Marshall
Most vertebrates have a duplex retina comprising two photoreceptor types, rods for dim-light (scotopic) vision and cones for bright-light (photopic) and color vision. However, deep-sea fishes are only active in dim-light conditions; hence, most species have lost their cones in favor of a simplex retina composed exclusively of rods. Although the pearlsides, Maurolicus spp., have such a pure rod retina, their behavior is at odds with this simplex visual system. Contrary to other deep-sea fishes, pearlsides are mostly active during dusk and dawn close to the surface, where light levels are intermediate (twilight or mesopic) and require the use of both rod and cone photoreceptors...
November 2017: Science Advances
https://www.readbyqxmd.com/read/29133032/measurements-of-neuronal-color-tuning-procedures-pitfalls-and-alternatives
#9
J Patrick Weller, Gregory D Horwitz
Measuring the color tuning of visual neurons is important for understanding the neural basis of vision, but it is challenging because of the inherently three-dimensional nature of color. Color tuning cannot be represented by a one-dimensional curve, and measuring three-dimensional tuning curves is difficult. One approach to addressing this challenge is to analyze neuronal color tuning data through the lens of mathematical models that make assumptions about the shapes of tuning curves. In this paper, we discuss the linear-nonlinear cascade model as a platform for measuring neuronal color tuning...
November 10, 2017: Vision Research
https://www.readbyqxmd.com/read/29129481/image-processing-strategies-based-on-saliency-segmentation-for-object-recognition-under-simulated-prosthetic-vision
#10
Heng Li, Xiaofan Su, Jing Wang, Han Kan, Tingting Han, Yajie Zeng, Xinyu Chai
BACKGROUND AND OBJECTIVE: Current retinal prostheses can only generate low-resolution visual percepts constituted of limited phosphenes which are elicited by an electrode array and with uncontrollable color and restricted grayscale. Under this visual perception, prosthetic recipients can just complete some simple visual tasks, but more complex tasks like face identification/object recognition are extremely difficult. Therefore, it is necessary to investigate and apply image processing strategies for optimizing the visual perception of the recipients...
November 9, 2017: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/29121209/genomic-environment-impacts-color-vision-evolution-in-a-family-with-visually-based-sexual-selection
#11
Benjamin A Sandkam, Jeffrey B Joy, Corey T Watson, Felix Breden
Many models of evolution by sexual selection predict a co-evolution of sensory systems and mate preferences, but the genomic architecture (number and arrangement of contributing loci) underlying these characters could constrain this co-evolution. Here we examine how the genomic organization and evolution of the opsin genes (responsible for tuning color vision) can influence the evolutionary trajectory of sexually selected traits across 15 species in the family Poeciliidae, which includes classic systems for studies of color-mediated sexual selection such as guppies, swordtails and mollies...
November 7, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29114192/optic-neuritis-observation-and-experience-at-a-tertiary-care-hospital-in-qassim-region-saudi-arabia
#12
Mohammad Jawad Alamgir, Syed Abrar Ali, Nermin Aly Hamdy, Moin Zafar Khan, Elgamri E Mohammad
Objectives: Optic neuritis (ON) can occur in isolation or association with multiple sclerosis (MS) or neuromyelitis optica. ON, is seen more commonly in Caucasians and interaction is found to exist between ethnic origin and the latitude at which the patient grows up. At present limited information is available about the profile of ON in Saudi patients. We aimed to analyze the records of ON patients, in regard to their presentation, natural history, treatment outcome, and risk and association with MS...
November 2017: International Journal of Health Sciences
https://www.readbyqxmd.com/read/29111567/a-computer-vision-for-animal-ecology
#13
REVIEW
Ben G Weinstein
1.A central goal of animal ecology is to observe species in the natural world. The cost and challenge of data collection often limit the breadth and scope of ecological study. Ecologists often use image capture to bolster data collection in time and space. However, the ability to process these images remains a bottleneck. 2.Computer vision can greatly increase the efficiency, repeatability, and accuracy of image review. Computer vision uses image features, such as color, shape, and texture to infer image content...
November 7, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/29103793/consensus-definition-for-atrophy-associated-with-age-related-macular-degeneration-on-oct-classification-of-atrophy-report-3
#14
Srinivas R Sadda, Robyn Guymer, Frank G Holz, Steffen Schmitz-Valckenberg, Christine A Curcio, Alan C Bird, Barbara A Blodi, Ferdinando Bottoni, Usha Chakravarthy, Emily Y Chew, Karl Csaky, Ronald P Danis, Monika Fleckenstein, K Bailey Freund, Juan Grunwald, Carel B Hoyng, Glenn J Jaffe, Sandra Liakopoulos, Jordi M Monés, Daniel Pauleikhoff, Philip J Rosenfeld, David Sarraf, Richard F Spaide, Ramin Tadayoni, Adnan Tufail, Sebastian Wolf, Giovanni Staurenghi
PURPOSE: To develop consensus terminology and criteria for defining atrophy based on OCT findings in the setting of age-related macular degeneration (AMD). DESIGN: Consensus meeting. PARTICIPANTS: Panel of retina specialists, image reading center experts, retinal histologists, and optics engineers. METHODS: As part of the Classification of Atrophy Meetings (CAM) program, an international group of experts surveyed the existing literature, performed a masked analysis of longitudinal multimodal imaging for a series of eyes with AMD, and reviewed the results of this analysis to define areas of agreement and disagreement...
November 2, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29101639/an-automatic-markerless-registration-method-for-neurosurgical-robotics-based-on-an-optical-camera
#15
Fanle Meng, Fangwen Zhai, Bowei Zeng, Hui Ding, Guangzhi Wang
PURPOSE: Current markerless registration methods for neurosurgical robotics use the facial surface to match the robot space with the image space, and acquisition of the facial surface usually requires manual interaction and constrains the patient to a supine position. To overcome these drawbacks, we propose a registration method that is automatic and does not constrain patient position. METHODS: An optical camera attached to the robot end effector captures images around the patient's head from multiple views...
November 3, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29095594/chameleon-inspired-mechanochromic-photonic-films-composed-of-non-close-packed-colloidal-arrays
#16
Gun Ho Lee, Tae Min Choi, Bomi Kim, Sang Hoon Han, Jung Min Lee, Shin-Hyun Kim
Chameleons use a non-close-packed array of guanine nanocrystals in iridophores to develop and tune skin colors in the full visible range. Inspired by the biological process uncovered in panther chameleons, we designed photonic films containing a non-close-packed face-centered-cubic array of silica particles embedded in an elastomer. The non-close-packed array is formed by interparticle repulsion exerted by solvation layers on the particle surface, which is rapidly captured in the elastomer by photocuring of the dispersion medium...
November 8, 2017: ACS Nano
https://www.readbyqxmd.com/read/29082670/two-visual-systems-in-one-eyestalk-the-unusual-optic-lobe-metamorphosis-in-the-stomatopod-alima-pacifica
#17
Chan Lin, Thomas W Cronin
The compound eyes of adult stomatopod crustaceans have two to six ommatidial rows at the equator, called the midband, that are often specialized for color and polarization vision. Beneath the retina, this midband specialization is represented as enlarged optic lobe lamina cartridges and a hernia-like expansion in the medulla. We studied how the optic lobe transforms from the larvae, which possess typical crustacean larval compound eyes without a specialized midband, through metamorphosis into the adults with the midband in a two midband-row species Alima pacifica...
October 30, 2017: Developmental Neurobiology
https://www.readbyqxmd.com/read/29076459/an-optimized-content-aware-image-retargeting-method-toward-expanding-the-perceived-visual-field-of-the-high-density-retinal-prosthesis-recipients
#18
Heng Li, Yajie Zeng, Zhuofan Lu, Xiaofei Cao, Xiaofan Su, Xiaohong Sui, Jing Wang, Xinyu Chai
Retinal prosthesis devices have shown great value in restoring some sight for individuals with profoundly impaired vision, but the visual acuity and visual field provided by prostheses greatly limit recipients' visual experience. In this paper, we employ computer vision approaches to seek to expand the perceptible visual field in patients implanted potentially with a high-density retinal prosthesis while maintaining visual acuity as much as possible. Approach. We propose an optimized content-aware image retargeting method, by introducing salient object detection based on color and intensity-difference contrast, aiming to remap important information of a scene into a small visual field and preserve their original scale as much as possible...
October 27, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29074161/score2-report-5-vision-related-function-in-patients-with-macular-edema-secondary-to-central-retinal-or-hemiretinal-vein-occlusion
#19
Ingrid U Scott, Maria J Figueroa, Neal L Oden, Michael S Ip, Barbara A Blodi, Paul C VanVeldhuisen
PURPOSE: To describe baseline vision-related function, measured with the National Eye Institute Visual Function Questionnaire (NEI VFQ-25), in patients with macular edema secondary to central retinal vein occlusion (CRVO) or hemiretinal vein occlusion (HRVO) in the Study of COmparative Treatments for REtinal Vein Occlusion 2 (SCORE2); evaluate the baseline relationship between NEI VFQ-25 scores with visual acuity letter score (VALS) and central retinal thickness; and compare baseline NEI VFQ-25 scores in SCORE2 participants with those in normal-vision reference populations and patients in other retinal vein occlusion trials...
October 23, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29067037/x-fido-an-effective-application-for-detecting-olive-quick-decline-syndrome-with-deep-learning-and-data-fusion
#20
Albert C Cruz, Andrea Luvisi, Luigi De Bellis, Yiannis Ampatzidis
We have developed a vision-based program to detect symptoms of Olive Quick Decline Syndrome (OQDS) on leaves of Olea europaea L. infected by Xylella fastidiosa, named X-FIDO (Xylella FastIdiosa Detector for O. europaea L.). Previous work predicted disease from leaf images with deep learning but required a vast amount of data which was obtained via crowd sourcing such as the PlantVillage project. This approach has limited applicability when samples need to be tested with traditional methods (i.e., PCR) to avoid incorrect training input or for quarantine pests which manipulation is restricted...
2017: Frontiers in Plant Science
keyword
keyword
3692
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"