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Pupillometry

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https://www.readbyqxmd.com/read/29117062/relations-between-self-reported-daily-life-fatigue-hearing-status-and-pupil-dilation-during-a-speech-perception-in-noise-task
#1
Yang Wang, Graham Naylor, Sophia E Kramer, Adriana A Zekveld, Dorothea Wendt, Barbara Ohlenforst, Thomas Lunner
OBJECTIVE: People with hearing impairment are likely to experience higher levels of fatigue because of effortful listening in daily communication. This hearing-related fatigue might not only constrain their work performance but also result in withdrawal from major social roles. Therefore, it is important to understand the relationships between fatigue, listening effort, and hearing impairment by examining the evidence from both subjective and objective measurements. The aim of the present study was to investigate these relationships by assessing subjectively measured daily-life fatigue (self-report questionnaires) and objectively measured listening effort (pupillometry) in both normally hearing and hearing-impaired participants...
November 7, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/29055369/infrared-pupillometry-using-an-optical-coherence-tomography-scanner
#2
James A McHugh, Fion D Bremner
No abstract text is available yet for this article.
November 2017: Ophthalmology
https://www.readbyqxmd.com/read/29043601/pupillary-reflex-dilation-in-response-to-incremental-nociceptive-stimuli-in-patients-receiving-intravenous-ketamine
#3
Nada Sabourdin, Thomas Giral, Risa Wolk, Nicolas Louvet, Isabelle Constant
Pupillometry is a non-invasive monitoring technique, which allows dynamic pupillary diameter measurement by an infrared camera. Pupillary diameter increases in response to nociceptive stimuli. In patients anesthetized with propofol or volatile agents, the magnitude of this pupillary dilation is related to the intensity of the stimulus. Pupillary response to nociceptive stimuli has never been studied under ketamine anesthesia. Our objective was to describe pupillary reflex dilation after calibrated tetanic stimulations in patients receiving intravenous ketamine...
October 17, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29026357/use-of-digital-pupillometry-to-measure-sedative-response-to-propofol
#4
Jody H Haddock, Donald E Mercante, Rose Paccione, Jacob L Breaux, Sarah E Jolley, Jessica L Johnson, Sean E Connolly, Bennett P deBoisblanc
BACKGROUND: Digital pupillometry (DP) accurately and precisely measures pupillary responses. Little is known about using DP to measure the sedative effect of isolated propofol administration. METHODS: We conducted a cross-sectional study of 19 adults undergoing moderate sedation with propofol during which we measured pupillary changes using DP. RESULTS: Maximum and minimum pupillary diameters decreased significantly with propofol (mean change from baseline to procedural termination -1...
2017: Ochsner Journal
https://www.readbyqxmd.com/read/29017782/eyes-have-ears-indexing-the-orienting-response-to-sound-using-pupillometry
#5
Alexandre Marois, Katherine Labonté, Mark Parent, François Vachon
The rare occurrence of a sound deviating from the auditory background tends to trigger attentional orienting. While some sympathetic physiological responses can be used to index this orienting response, findings surrounding the pupillary dilation response (PDR) as a proxy for the orienting response are conflicting. The current study was tailor-designed to examine whether the PDR satisfies specific criteria of an orienting response index, namely the classic habituation pattern and a sensitivity to the size of the deviation...
October 7, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28994267/pupillary-light-reflex-and-circadian-synchronization-in-the-elderly
#6
Philipp Novotny, Herbert Plischke
Most elderly lack a synchronized circadian rhythm and often cannot benefit from light therapy. Non-visual effects of light are mediated through intrinsic photosensitive retinal ganglion cells (ipRGCs). With chromatic pupillometry, the functionality of ipRGCs and their functional circuit in the brain can be tested.
October 10, 2017: PsyCh Journal
https://www.readbyqxmd.com/read/28937242/pupillary-light-reflex-is-altered-in-adolescent-depression
#7
A Mestanikova, I Ondrejka, M Mestanik, D Cesnekova, Z Visnovcova, I Bujnakova, M Oppa, A Calkovska, I Tonhajzerova
Major depressive disorder is associated with abnormal autonomic regulation which could be noninvasively studied using pupillometry. However, the studies in adolescent patients are rare. Therefore, we aimed to study the pupillary light reflex (PLR), which could provide novel important information about dynamic balance between sympathetic and parasympathetic nervous system in adolescent patients suffering from major depression. We have examined 25 depressive adolescent girls (age 15.2+/-0.3 year) prior to pharmacotherapy and 25 age/gender-matched healthy subjects...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28912712/effect-of-cognitive-demand-on-functional-visual-field-performance-in-senior-drivers-with-glaucoma
#8
Viswa Gangeddula, Maud Ranchet, Abiodun E Akinwuntan, Kathryn Bollinger, Hannes Devos
Purpose: To investigate the effect of cognitive demand on functional visual field performance in drivers with glaucoma. Method: This study included 20 drivers with open-angle glaucoma and 13 age- and sex-matched controls. Visual field performance was evaluated under different degrees of cognitive demand: a static visual field condition (C1), dynamic visual field condition (C2), and dynamic visual field condition with active driving (C3) using an interactive, desktop driving simulator. The number of correct responses (accuracy) and response times on the visual field task were compared between groups and between conditions using Kruskal-Wallis tests...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28894607/evaluation-of-cholinergic-deficiency-in-preclinical-alzheimer-s-disease-using-pupillometry
#9
Shaun Frost, Liam Robinson, Christopher C Rowe, David Ames, Colin L Masters, Kevin Taddei, Stephanie R Rainey-Smith, Ralph N Martins, Yogesan Kanagasingam
Cortical cholinergic deficiency is prominent in Alzheimer's disease (AD), and published findings of diminished pupil flash response in AD suggest that this deficiency may extend to the visual cortical areas and anterior eye. Pupillometry is a low-cost, noninvasive technique that may be useful for monitoring cholinergic deficits which generally lead to memory and cognitive disorders. The aim of the study was to evaluate pupillometry for early detection of AD by comparing the pupil flash response (PFR) in AD (N = 14) and cognitively normal healthy control (HC, N = 115) participants, with the HC group stratified according to high (N = 38) and low (N = 77) neocortical amyloid burden (NAB)...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28885673/reproducibility-and-normal-values-of-static-pupil-diameters
#10
Simon Schröder, Ekaterina Chashchina, Edgar Janunts, Alan Cayless, Achim Langenbucher
PURPOSE: To provide additional information on normal values of static pupil diameter measurements for binocular infrared pupillometry with PupilX, a commercial pupillometer, and assess the reproducibility of this device's measurements. METHODS: The pupil diameters from 91 study participants with normal eyes with an average age of 39.7 years (SD 16.4 years) were measured with PupilX under scotopic (0 lx), mesopic (1 lx), and photopic (16 lx) illumination. To assess the repeatability of the device, each measurement was repeated 5 times...
September 8, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28864843/pupillary-autonomic-dysfunction-in-patients-with-anca-associated-vasculitis
#11
Philipp Moog, O Eren, S Kossegg, K Valda, A Straube, M Grünke, H Schulze-Koops, M Witt
OBJECTIVE: To assess autonomic function by infrared dynamic pupillometry in patients with ANCA-vasculitis (AAV) in correlation to autonomic symptoms, disease specific clinical parameters and cardiovascular reflex tests. METHODS: Patients with AAV and healthy controls underwent pupillometry at rest and after sympathetic stimulation (cold pressor test). Three parasympathetic parameters (amplitude, relative amplitude, maximum constriction velocity) and one sympathetic parameter (late dilatation velocity) were assessed...
December 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28860528/pupillary-responses-to-light-are-not-affected-by-narrow-irido-corneal-angles
#12
A V Rukmini, Raymond P Najjar, Eray Atalay, Sourabh Sharma, Jing Zhan Lock, Mani Baskaran, Monisha Nongpiur, Joshua J Gooley, Tin Aung, Dan Milea
Chromatic pupillometry is an emerging method for evaluating ocular health that relies upon the differential stimulation of rods, cones, and intrinsically photosensitive retinal ganglion cells (ipRGCs). Although it has been investigated in conditions affecting the outer or inner retina, there is a paucity of studies in conditions where the anterior chamber of the eye is affected. Primary angle closure suspects (PACS) are defined as eyes with narrow anterior chamber angles and intact retina. PACS patients are at risk of developing primary angle closure glaucoma and are prophylactically treated by performing laser peripheral iridotomy (LPI)...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28755458/tonic-noradrenergic-activity-modulates-explorative-behavior-and-attentional-set-shifting-evidence-from-pupillometry-and-gaze-pattern-analysis
#13
Péter Pajkossy, Ágnes Szőllősi, Gyula Demeter, Mihály Racsmány
A constant task for every living organism is to decide whether to exploit rewards associated with current behavior or to explore the environment for more rewarding options. Current empirical evidence indicates that exploitation is related to phasic whereas exploration is related to tonic firing mode of noradrenergic neurons in the locus coeruleus. In humans, this exploration-exploitation trade-off is subserved by the ability to flexibly switch attention between task-related and task-irrelevant information. Here, we investigated whether this function, called attentional set shifting, is related to exploration and tonic noradrenergic discharge...
July 29, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28752807/objective-assessment-of-listening-effort-coregistration-of-pupillometry-and-eeg
#14
Kelly Miles, Catherine McMahon, Isabelle Boisvert, Ronny Ibrahim, Peter de Lissa, Petra Graham, Björn Lyxell
Listening to speech in noise is effortful, particularly for people with hearing impairment. While it is known that effort is related to a complex interplay between bottom-up and top-down processes, the cognitive and neurophysiological mechanisms contributing to effortful listening remain unknown. Therefore, a reliable physiological measure to assess effort remains elusive. This study aimed to determine whether pupil dilation and alpha power change, two physiological measures suggested to index listening effort, assess similar processes...
January 2017: Trends in Hearing
https://www.readbyqxmd.com/read/28750207/eye-gaze-and-pupillary-response-in-angelman-syndrome
#15
Michael P Hong, Janna L Guilfoyle, Lindsey N Mooney, Logan K Wink, Ernest V Pedapati, Rebecca C Shaffer, John A Sweeney, Craig A Erickson
BACKGROUND: Angelman syndrome (AS) is a rare neurological disorder characterized by severe developmental disability, communication impairment, elevated seizure risk, and motor system abnormalities. AIMS: The aims of this study were to determine the feasibility of social scene eye tracking and pupillometry measures in individuals with AS and to compare the performance of AS participants to individuals with idiopathic Autism Spectrum Disorder (ASD) and typically developing controls (TDC)...
July 24, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28719527/pupillometry-guided-intraoperative-remifentanil-administration-versus-standard-practice-influences-opioid-use-a-randomized-study
#16
RANDOMIZED CONTROLLED TRIAL
Nada Sabourdin, Jérôme Barrois, Nicolas Louvet, Agnès Rigouzzo, Marie-Laurence Guye, Christophe Dadure, Isabelle Constant
BACKGROUND: Pupillometry has shown promising results for assessing nociception in anesthetized patients. However, its benefits in clinical practice are not demonstrated. The aim of this prospective randomized study was to evaluate the impact of intraoperative pupillometry monitoring on perioperative opioid consumption in major gynecologic surgery. METHODS: After receiving ethics committee approval and written consent of patients, American Society of Anesthesiologists status I to II women undergoing gynecologic surgery were included in this single-blinded, prospective, parallel-arm randomized study...
August 2017: Anesthesiology
https://www.readbyqxmd.com/read/28716800/relationship-between-vascular-resistance-and-sympathetic-nerve-fiber-density-in-arterial-vessels-in-children-with-sleep-disordered-breathing
#17
Anna Kontos, Kurt Lushington, James Martin, Quenten Schwarz, Ryan Green, David Wabnitz, Xiangjun Xu, Elke M Sokoya, Scott Willoughby, Mathias Baumert, Antonio Ferrante, Melissa La Forgia, Declan Kennedy
BACKGROUND: Sleep disordered breathing in children is associated with increased blood flow velocity and sympathetic overactivity. Sympathetic overactivity results in peripheral vasoconstriction and reduced systemic vascular compliance, which increases blood flow velocity during systole. Augmented blood flow velocity is recognized to promote vascular remodeling. Importantly, increased vascular sympathetic nerve fiber density and innervation in early life plays a key role in the development of early-onset hypertension in animal models...
July 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28716667/pupillometric-evaluation-of-the-melanopsin-containing-retinal-ganglion-cells-in-mitochondrial-and-non-mitochondrial-optic-neuropathies
#18
Shakoor Ba-Ali, Henrik Lund-Andersen
In recent years, chromatic pupillometry is used in humans to evaluate the activity of melanopsin expressing intrinsic photosensitive retinal ganglion cells (ipRGCs). Blue light is used to stimulate the ipRGCs and red light activates the rod/cone photoreceptors. The late re-dilation phase of pupillary light reflex is primarily driven by the ipRGCs. Optic neuropathies i.e. Leber hereditary optic neuropathy (LHON), autosomal dominant optic atrophy (ADOA), nonarteritic anterior ischemic optic neuropathy (NAION), glaucoma, optic neuritis and idiopathic intracranial hypertension (IIH) are among the diseases, which have been subject to pupillometric studies...
July 14, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28711663/cognitive-workload-across-the-spectrum-of-cognitive-impairments-a-systematic-review-of-physiological-measures
#19
REVIEW
Maud Ranchet, John C Morgan, Abiodun E Akinwuntan, Hannes Devos
Our objective was to identify the physiological measures that are sensitive to assessing cognitive workload across the spectrum of cognitive impairments. Three database searches were conducted: PubMed, PsychINFO, and Web of Science. Studies from the last decade that used physiological measures of cognitive workload in older adults (mean age >65 years-old) were reviewed. The cognitive workload of healthy older individuals was compared with the cognitive workload of younger adults, patients with mild cognitive impairment (MCI), and patients with Alzheimer's diseases (AD)...
July 12, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28709109/no-arousal-biased-competition-in-focused-visuospatial-attention
#20
Árni Gunnar Ásgeirsson, Sander Nieuwenhuis
Arousal sometimes enhances and sometimes impairs perception and memory. A recent theory attempts to reconcile these findings by proposing that arousal amplifies the competition between stimulus representations, strengthening already strong representations and weakening already weak representations. Here, we report a stringent test of this arousal-biased competition theory in the context of focused visuospatial attention. Participants were required to identify a briefly presented target in the context of multiple distractors, which varied in the degree to which they competed for representation with the target, as revealed by psychophysics...
November 2017: Cognition
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