keyword
MENU ▼
Read by QxMD icon Read
search

pupil dilation

keyword
https://www.readbyqxmd.com/read/29348407/error-related-cardiac-response-as-information-for-visibility-judgements
#1
Marta Łukowska, Michał Sznajder, Michał Wierzchoń
Interoception provides information about the saliency of external or internal sensory events and thus may inform perceptual decision-making. Error in performance is an example of a motivationally significant internal event that evokes autonomic nervous system response resembling the orienting response: heart rate deceleration, increased skin conductance response, and pupil dilation. Here, we investigate whether error-related cardiac activity may serve as a source of information when making metacognitive judgments in an orientation discrimination backward masking task...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29339957/a-case-of-synchronised-pupillary-and-nasal-cycling-evidence-for-a-central-autonomic-pendulum
#2
Fion D Bremner, Jonas Gälldin Nordström
We previously reported that some healthy individuals show alternating anisocoria. We now describe one such individual who also exhibits a classic nasal cycle (alternating periods of nasal congestion and decongestion). We made measurements of his pupil asymmetry and nasal asymmetry at 21 different time points and found that these variables were always synchronised such that greater nasal airflow was invariably found on the same side as the larger pupil. We hypothesise that a common central oscillator may be responsible for co-modulating the sympathetic outflow to both nasal vessels and iris dilator muscles in some healthy individuals...
October 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/29336629/pupillary-manifestations-of-marfan-syndrome-from-the-marfan-eye-consortium-of-chicago
#3
Sanket S Shah, Sudhi P Kurup, Hantamalala Ralay Ranaivo, Rebecca B Mets-Halgrimson, Marilyn B Mets
BACKGROUND: Marfan syndrome (MFS) is a genetic disorder that affects multiple organ systems, including the eye. The most common ocular manifestations include ectopia lentis and retinal detachment. The current literature qualitatively cites that MFS patients have miotic or "poorly dilating" pupils. This study was the first to quantitatively assess pupillary function in MFS patients. MATERIALS AND METHODS: 57 eyes from 29 MFS patients, 36 eyes from 18 pediatric age- and gender-matched controls, and 44 eyes from 22 adult age-matched controls were measured in a clinic-based cross sectional study...
January 16, 2018: Ophthalmic Genetics
https://www.readbyqxmd.com/read/29329947/-pseudoexfoliation-syndrome-and-pseudoexfoliation-glaucoma
#4
REVIEW
C Schweitzer
Pseudoexfoliation syndrome is an age-related systemic disease that mainly affects the anterior structures of the eye. Despite a worldwide distribution, reported incidence and prevalence of this syndrome vary widely between ethnicities and geographical areas. The exfoliative material is composed mainly of abnormal cross-linked fibrils that accumulate progressively in some organs such as the heart, blood vessels, lungs or meninges, and particularly in the anterior structures of the eye. The exact pathophysiological process still remains unclear but the association of genetic and environmental factors are thought to play a role in the development and progressive extracellular accumulation of exfoliative material...
January 9, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29315718/experimental-investigation-of-accommodation-in-eyes-fit-with-multifocal-contact-lenses-using-a-clinical-auto-refractor
#5
Basal H Altoaimi, Pete Kollbaum, Dawn Meyer, Arthur Bradley
PURPOSE: Multifocal or multi-zone contact lenses are increasingly being fit to young eyes in an attempt to control myopia progression. However, success in achieving this aim may depend on how much the eye accommodates. The purpose of the current work was to evaluate the ability of an open-field clinical autorefractor to measure on-axis refractive state and accommodation in eyes fit with multifocal contact lenses (CLs). METHODS: Refractive state was measured with a Grand Seiko WAM-5500 autorefractor (www...
January 8, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29315412/automated-pupillometry-and-detection-of-clinical-transtentorial-brain-herniation-a-case-series
#6
Alexander Papangelou, Elizabeth K Zink, Wan-Tsu W Chang, Anthony Frattalone, Daniel Gergen, Allan Gottschalk, Romergryko G Geocadin
Introduction: Transtentorial herniation (TTH) is a life-threatening neurologic condition that typically results from expansion of supratentorial mass lesions. A change in bedside pupillary examination is central to the clinical diagnosis of TTH. Materials and Methods: To quantify the changes in the pupillary examination that precede and accompany TTH and its treatment, we evaluated 12 episodes of herniation in three patients with supratentorial mass lesions using automated pupillometry (NeurOptics, Inc...
January 5, 2018: Military Medicine
https://www.readbyqxmd.com/read/29311335/melanopsin-and-l-cone-induced-pupil-constriction-is-inhibited-by-s-and-m-cones-in-humans
#7
Tom Woelders, Thomas Leenheers, Marijke C M Gordijn, Roelof A Hut, Domien G M Beersma, Emma J Wams
The human retina contains five photoreceptor types: rods; short (S)-, mid (M)-, and long (L)-wavelength-sensitive cones; and melanopsin-expressing ganglion cells. Recently, it has been shown that selective increments in M-cone activation are paradoxically perceived as brightness decrements, as opposed to L-cone increments. Here we show that similar effects are also observed in the pupillary light response, whereby M-cone or S-cone increments lead to pupil dilation whereas L-cone or melanopic illuminance increments resulted in pupil constriction...
January 8, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29305356/case-of-a-fixed-and-dilated-pupil-acute-anisocoria-secondary-to-aerosol-ipratropium-bromide
#8
Laura Royce, Chris Schulz, Nick Brown
No abstract text is available yet for this article.
January 4, 2018: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/29301874/locus-coeruleus-activity-strengthens-prioritized-memories-under-arousal
#9
David Clewett, Ringo Huang, Rico Velasco, Tae-Ho Lee, Mara Mather
Recent models posit that bursts of locus coeruleus (LC) activity amplify neural gain, such that limited attention and encoding resources focus even more on prioritized mental representations under arousal. Here, we tested this hypothesis in human males and females using functional magnetic resonance imaging (fMRI), neuromelanin MRI, and pupil dilation, a biomarker of arousal and LC activity. During scanning, participants performed a monetary incentive encoding task in which threat of punishment motivated participants to prioritize encoding of scene images over superimposed objects...
January 4, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29290509/ambient-mass-spectrometry-for-rapid-diagnosis-of-psychoactive-drugs-overdose-in-an-unstable-patient
#10
Chi-Wei Lee, Yu-Ying Chao, Jentaie Shiea, Jheng-Heng Shen, Hei-Hwa Lee, Bai-Hsiun Chen
A 25-year-old man suffered from consciousness change was sent to our emergency department by friends who reported that they were not sure what had happened to him. Physical examination revealed bilateral pupils dilatation, lethargy, slurred speech, and ataxia. Computer-aided tomographic scan of the brain revealed no definite evidence of intracranial lesions. Routine laboratory tests revealed total physiological turmoil. Despite immediate commencement of aggressive treatment, the patient's condition deteriorated long before the traditional drug screen provided an answer for the identities of the multiple drugs overdose...
December 20, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29286878/urrets-zavalia-like-syndrome-as-a-complication-of-sickle-cell-disease
#11
Seyed Ali Tabatabaei, Mirataollah Salabati, Mohammad Soleimani
INTRODUCTION: We present a case of a sickle cell patient who presented with Urrets-Zavalia Syndrome (UZS) like characteristics without having undergone any surgical procedures. CASE REPORT: A 41-year-old woman diagnosed with sickle cell thalassemia presented with glaucoma of the both eyes. Visual acuity was decreased in both eyes. Epithelial edema was observed in corneas of both eyes, most prominently in the left eye. Peripheral anterior synechiae were present bilaterally...
December 29, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/29273687/ophthalmoscopy-in-the-21st-century-the-2017-h-houston-merritt-lecture
#12
REVIEW
Valérie Biousse, Beau B Bruce, Nancy J Newman
Although the usefulness of viewing the ocular fundus is well-recognized, ophthalmoscopy is infrequently and poorly performed by most nonophthalmologist physicians, including neurologists. Barriers to the practice of ophthalmoscopy by nonophthalmologists include not only the technical difficulty related to direct ophthalmoscopy, but also lack of adequate training and discouragement by preceptors. Recent studies have shown that digital retinal fundus photographs with electronic transmission and remote interpretation of images by an ophthalmologist are an efficient and reliable way to allow examination of the ocular fundus in patients with systemic disorders such as diabetes mellitus...
December 22, 2017: Neurology
https://www.readbyqxmd.com/read/29259566/intrinsic-altruism-or-social-motivation-what-does-pupil-dilation-tell-us-about-children-s-helping-behavior
#13
Carolina Pletti, Anne Scheel, Markus Paulus
No abstract text is available yet for this article.
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29251663/pain-or-nociception-subjective-experience-mediates-the-effects-of-acute-noxious-heat-on-autonomic-responses
#14
Dominik Mischkowski, Esther E Palacios-Barrios, Lauren Banker, Troy C Dildine, Lauren Y Atlas
Nociception reliably elicits an autonomic nervous system (ANS) response. Because pain and ANS circuitry interact on multiple spinal, subcortical, and cortical levels, it remains unclear whether autonomic responses are simply a reflexive product of noxious stimulation regardless of how stimulation is consciously perceived or whether the experience of pain mediates ANS responses to noxious stimulation. To test these alternative predictions, we examined the relative contribution of noxious stimulation and individual pain experience to ANS responses in healthy volunteers who underwent one or two pain assessment tasks...
December 13, 2017: Pain
https://www.readbyqxmd.com/read/29247487/the-locus-coeruleus-norepinephrine-system-as-pacemaker-of-attention-a-developmental-mechanism-of-derailed-attentional-function-in-autism-spectrum-disorder
#15
REVIEW
Nico Bast, Luise Poustka, Christine M Freitag
Children with autism spectrum disorder (ASD) exhibit diminished visual engagement to environmental stimuli. Aberrant attentional function provides an explanation by reduced phasic alerting and orienting to exogenous stimuli. We review aberrant attentional function (alerting, orienting, and attentional control) in children with ASD as studied by neurocognitive and neurophysiological tasks as well as magnetic resonance imaging studies. The locus coeruleus - norepinephrine (LC-NE) system is outlined as a pacemaker of attentional function...
December 15, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29246389/mitigating-passive-fatigue-during-monotonous-drives-with-thermal-stimuli-insights-into-the-effect-of-different-stimulation-durations
#16
Elisabeth Schmidt, Angelika C Bullinger
Driving on monotonous roads has been shown to cause passive fatigue as even non-sleep-deprived drivers suffer from the lack of stimuli. Consequently, alertness is reduced and the risk of accidents increases. To counteract this risk, measures need to be taken to mitigate driver fatigue. While in the past, some studies have been focused on the potential of thermal stimuli to reduce fatigue, their results seem inconclusive. Examining the study conditions in which the thermal stimuli were studied, it becomes obvious that the duration of the thermal stimulus strongly affects perceived fatigue...
December 12, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/29246204/the-application-of-wide-field-laser-ophthalmoscopy-in-fundus-examination-before-myopic-refractive-surgery
#17
Lin Liu, Fang Wang, Ding Xu, Chunlei Xie, Jun Zou
BACKGROUND: To evaluate wide-field laser ophthalmoscopy (Optomap 200Tx) for screening retinal lesions before myopic refractive surgery. METHODS: Seventy-eight eyes of 78 consecutive refractive surgery candidates were included in this study. All subjects underwent Optomap 200Tx, mydriatic slit-lamp lens examination and the Goldmann three-mirror contact lens examination, which was considered as the reference method for determining retinal lesions. RESULTS: Forty of 78 eyes had retinal lesions (51...
December 15, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/29245636/additions-to-the-description-of-i-paroplocephalus-i-i-atriceps-i-serpentes-elapidae-with-a-discussion-on-pupil-shape-in-it-and-other-australian-snakes
#18
Brian Bush
Morphometric data on an additional twelve individuals of Paroplocephalus atriceps Storr are included enlarging Keogh et al.'s 2000 description of the genus and further verifying its affinities with Hoplocephalus. Included are comments on its venom and observations confirming arboreality and although primarily nocturnal, it includes some diurnal activity. Various authors have erroneously suggested it has vertically elliptic pupils but they are round. During an examination of snake's eyes, it was found that several additional species have pupils that require re-describing, especially Suta fasciata Rosen, S...
November 7, 2017: Zootaxa
https://www.readbyqxmd.com/read/29220579/pupillary-responses-to-static-images-of-men-and-women-a-possible-measure-of-sexual-interest
#19
Robert J Snowden, Aimee McKinnon, Julie Fitoussi, Nicola S Gray
The pupil dilates to images that are arousing. In Experiment 1, we examined if the pupil's response to brief presentations (2,000 ms) of static images could be used to identify individuals' sexual orientation. Participants were grouped according to their self-reported gender and sexual orientation (male heterosexual, N = 20; male bisexual, N = 13; male homosexual, N = 19; female heterosexual, N = 28; female bisexual, N = 21; female homosexual, N = 17). Pupil size was monitored to images of men in seminude poses, women in seminude poses, or neutral images...
December 8, 2017: Journal of Sex Research
https://www.readbyqxmd.com/read/29220361/pre-stimulus-pupil-dilation-and-the-preparatory-control-of-attention
#20
Jessica L Irons, Minjeong Jeon, Andrew B Leber
Task preparation involves multiple component processes, including a general evaluative process that signals the need for adjustments in control, and the engagement of task-specific control settings. Here we examined the dynamics of these different mechanisms in preparing the attentional control system for visual search. We explored preparatory activity using pupil dilation, a well-established measure of task demands and effortful processing. In an initial exploratory experiment, participants were cued at the start of each trial to search for either a salient color singleton target (an easy search task) or a low-salience shape singleton target (a difficult search task)...
2017: PloS One
keyword
keyword
117190
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"