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https://www.readbyqxmd.com/read/28524817/functional-dissociation-of-stimulus-intensity-encoding-and-predictive-coding-of-pain-in-the-insula
#1
Stephan Geuter, Sabrina Boll, Falk Eippert, Christian Büchel
The computational principles by which the brain creates a painful experience from nociception are still unknown. Classic theories suggest that cortical regions either reflect stimulus intensity or additive effects of intensity and expectations, respectively. By contrast, predictive coding theories provide a unified framework explaining how perception is shaped by the integration of beliefs about the world with mismatches resulting from the comparison of these believes against sensory input. Using functional magnetic resonance imaging during a probabilistic heat pain paradigm, we investigated which computations underlie pain perception...
May 19, 2017: ELife
https://www.readbyqxmd.com/read/28523059/efficacy-and-safety-of-optic-nerve-sheath-fenestration-in-patients-with-raised-intracranial-pressure
#2
Muhammad Amer Yaqub, Mohammad Asim Mehboob, Qamar Ul Islam
OBJECTIVE: To evaluate the efficacy and safety of Optic Nerve Sheath Fenestration (ONSF) in patients with raised intracranial pressure (ICP). METHODS: This Quasi Experimental Study was conducted at Armed Forces Institute of Ophthalmology, Rawalpindi from July 2013 to July 2015. Thirty one eyes of 18 patients who underwent ONSF for raised ICP were followed up for one year to ascertain efficacy and safety of ONSF procedure. RESULTS: Thirteen (72...
March 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28522252/optical-quality-of-rotationally-symmetrical-contact-lenses-derived-from-their-power-profiles
#3
Antonio J Del Águila-Carrasco, Daniel Monsálvez-Romín, Eleni Papadatou
PURPOSE: To present a methodology for evaluating the optical quality of rotationally symmetrical contact lenses (CLs) from a single power profile. METHODS: Simulated rotationally symmetrical power profiles corresponding to different CLs designs (monofocal, two-zone center-near bifocal, and four-zone center-distance bifocal) were used to calculate the wavefront error profile by means of numerical integration. Then, each lens wavefront error profile was spun around the center to obtain the lens wavefront error surface...
May 15, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28516453/dba-2j-mouse-model-for-experimental-glaucoma-pitfalls-and-problems
#4
Anita J Turner, Roshana Vander Wall, Vivek Gupta, Alex Klistorner, Stuart L Graham
PURPOSE: The DBA/2J mouse has been described as a model for congenital experimental glaucoma. It develops anterior segment anomalies with synechiae and pigment dispersion leading to raised intraocular pressure (IOP) and glaucomatous damage. However there are serious practical considerations when using this model in longitudinal studies. METHODS: We followed 118 mice from 12 - 48 weeks of age in a pharmaceutical trial. Here we report on the findings in control animals (n=37)...
May 18, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28515685/pupillary-response-to-negative-emotional-stimuli-is-differentially-affected-in-meditation-practitioners
#5
Alejandra Vasquez-Rosati, Enzo P Brunetti, Carmen Cordero, Pedro E Maldonado
Clinically, meditative practices have become increasingly relevant, decreasing anxiety in patients and increasing antibody production. However, few studies have examined the physiological correlates, or effects of the incorporation of meditative practices. Because pupillary reactivity is a marker for autonomic changes and emotional processing, we hypothesized that the pupillary responses of mindfulness meditation practitioners (MP) and subjects without such practices (non-meditators (NM)) differ, reflecting different emotional processing...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28512503/massive-oculomotor-nerve-enlargement-a-case-of-presumed-schwannomatosis
#6
Laura Donaldson, Ryan Rebello, Amadeo Rodriguez
A 45-year-old man presented with a slowly progressive pupil-involving third nerve palsy. Magnetic resonance imaging (MRI) revealed a tubular lesion extending from the interpeduncular cistern through the cavernous sinus and into the left orbit where it branched into a superior and an inferior division, clearly outlining the anatomy of the third cranial nerve. Multiple other, less pronounced, enlarged cranial nerves were noted. The differential diagnosis included chronic inflammatory demyelinating polyneuropathy (CIDP), hereditary motor and sensory neuropathy (HMSN), neurofibromatosis (NF), and schwannomatosis...
June 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/28511602/evaluation-of-student-handwashing-practices-during-a-school-based-hygiene-program-in-rural-western-kenya-2007
#7
Genevieve La Con, Katharine Schilling, Julie Harris, Bobbie Person, Mercy Owuor, Lorraine Ogange, Sitnah Faith, Robert Quick
Unsafe drinking water and inadequate handwashing facilities in primary schools increase the risk of absenteeism due to diarrhea and respiratory infections. To mitigate these risks, we provided 28 schools in rural Western Kenya with handwashing and drinking water stations (containers with lids and taps on metal stands), bleach for water treatment, soap for handwashing, and educational materials. We observed the use of the water stations and assessed teachers' attitudes toward the intervention. Of 151 total handwashing stations, 69 (59%) were observed to have soap and water and treated drinking water 4 months after implementation; observations of pupils showed an increase in handwashing behavior in water stations located < 10 m, as compared with those >10 m, from latrines ( p < ...
January 2017: International Quarterly of Community Health Education
https://www.readbyqxmd.com/read/28505505/measuring-listening-related-effort-and-fatigue-in-school-aged-children-using-pupillometry
#8
Ronan McGarrigle, Piers Dawes, Andrew J Stewart, Stefanie E Kuchinsky, Kevin J Munro
Stress and fatigue from effortful listening may compromise well-being, learning, and academic achievement in school-aged children. The aim of this study was to investigate the effect of a signal-to-noise ratio (SNR) typical of those in school classrooms on listening effort (behavioral and pupillometric) and listening-related fatigue (self-report and pupillometric) in a group of school-aged children. A sample of 41 normal-hearing children aged 8-11years performed a narrative speech-picture verification task in a condition with recommended levels of background noise ("ideal": +15dB SNR) and a condition with typical classroom background noise levels ("typical": -2dB SNR)...
May 12, 2017: Journal of Experimental Child Psychology
https://www.readbyqxmd.com/read/28504528/the-importance-of-arousal-for-variation-in-working-memory-capacity-and-attention-control-a-latent-variable-pupillometry-study
#9
Nash Unsworth, Matthew K Robison
A great deal of prior research has examined the relation between working memory capacity (WMC) and attention control. The current study explored the role of arousal in individual differences in WMC and attention control. Participants performed multiple WMC and attention control tasks. During the attention control tasks participants were periodically probed regarding their current attentional state and both baseline and task-evoked pupillary responses were recorded as indicators of tonic arousal and phasic arousal because of attentional effort, respectively...
May 15, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28504010/effects-of-selective-serotonin-reuptake-inhibitors-on-intraocular-pressure-and-anterior-segment-parameters-in-open-angle-eyes
#10
Gamze Uçan Gündüz, Neslihan Parmak Yener, Oğuzhan Kılınçel, Cem Gündüz
PURPOSE: To evaluate the short and long term effects of selective serotonin reuptake inhibitors (SSRIs) on intraocular pressure (IOP) and anterior segment parameters in open angle eyes. MATERIALS AND METHODS: This cross-sectional study included 325 eyes of 166 subjects. Subjects were divided into three groups; group 1 included 116 eyes of 58 patients receiving SSRIs for 1 week - 6 months, group 2 included 102 eyes of 53 patients receiving SSRIs for longer than 6 months, and group 3 included 107 eyes of 55 healthy subjects not receiving any drugs...
May 14, 2017: Cutaneous and Ocular Toxicology
https://www.readbyqxmd.com/read/28503438/comparison-of-visual-effects-of-fs-lasik-for-myopia-centered-on-the-coaxially-sighted-corneal-light-reflex-or-the-line-of-sight
#11
Jing Zhang, Shi-Sheng Zhang, Qin Yu, Jing-Cai Lian
AIM: To compare visual quality after femtosecond laser in situ keratomileusis (FS-LASIK), between the coaxially sighted corneal light reflex (CSCLR) group and conventional ablation line of sight (LOS) group. METHODS: In total, 243 eyes (122 patients) were treated with centration on the CSCLR (visual axis) and 238 eyes (119 patients) treated with centration on the pupil center (LOS). Postoperative outcomes [uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA)], safety index, efficacy index, refractive outcome, ablation center distance from the visual axis, corneal high-order aberrations, subjective discomfort glare and shadowing incidence rate, and contrast sensitivity at 1, 3, and 6mo were measured and compared...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28503437/comparison-of-postoperative-optical-quality-according-to-the-degree-of-decentering-of-v4c-implantable-collamer-lens
#12
Min Ji Park, Hye Min Jeon, Kyoung Heon Lee, Sang Youp Han
AIM: To evaluate the clinical outcomes of V4c implantable collamer lens (Hole ICL) implantation with regard to the optical quality assessed according to different degrees of decentering. METHODS: This included 49 eyes that received conventional ICL and 94 eyes that received Hole ICL. The eyes that received Hole ICL were divided into three groups according to the degree of decentering: group 1, central hole within 1 hole diameter (HD) from the pupil center; group 2, central hole within 1 HD to 2 HD; and group 3, central hole within 2 HD to 3 HD...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28503429/suitability-of-open-field-autorefractors-as-pupillometers-and-instrument-design-effects
#13
Carles Otero, Mikel Aldaba, Oriol Ferrer, Andrea Gascón, Juan C Ondategui-Parra, Jaume Pujol
AIM: To determine the agreement and repeatability of the pupil measurement obtained with VIP-200 (Neuroptics), PowerRef II (Plusoptix), WAM-5500 (Grand Seiko) and study the effects of instrument design on pupillometry. METHODS: Forty patients were measured twice in low, mid and high mesopic. Repeatability was analyzed with the within-subject standard deviation (Sw) and paired t-tests. Agreement was studied with Bland-Altman plots and repeated measures ANOVA. Instrument design analysis consisted on measuring pupil size with PowerRef II simulating monocular and binocular conditions as well as with proximity cues and without proximity cues...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28501549/the-effect-of-phasic-auditory-alerting-on-visual-perception
#14
Anders Petersen, Annemarie Hilkjær Petersen, Claus Bundesen, Signe Vangkilde, Thomas Habekost
Phasic alertness refers to a short-lived change in the preparatory state of the cognitive system following an alerting signal. In the present study, we examined the effect of phasic auditory alerting on distinct perceptual processes, unconfounded by motor components. We combined an alerting/no-alerting design with a pure accuracy-based single-letter recognition task. Computational modeling based on Bundesen's Theory of Visual Attention was used to examine the effect of phasic alertness on visual processing speed and threshold of conscious perception...
May 11, 2017: Cognition
https://www.readbyqxmd.com/read/28501394/-changes-in-hazardous-drinking-in-spanish-adolescent-population-in-the-last-decade-2004-2013-using-a-quantitative-and-qualitative-design
#15
Alejandro Pérez-Milena, Manuel de Dios Redondo-Olmedilla, María Luz Martínez-Fernández, Idoia Jiménez-Pulido, Inmaculada Mesa-Gallardo, Francisco Javier Leal-Helmling
OBJECTIVE: To determine the changes in hazardous drinking in adolescents in the last decade, as well as their motivations and experiences. DESIGN: Firstly, a descriptive design using a self-report questionnaire, and secondly an explanatory qualitative design, with video recordings of discussion groups with content analysis (coding, triangulation of categories and verification of results). SETTING AND PARTICIPANTS: Pupils from an urban High School, administering a questionnaire every 3 years from 2004 to 2013...
May 10, 2017: Atencion Primaria
https://www.readbyqxmd.com/read/28495972/multiple-transient-signals-in-human-visual-cortex-associated-with-an-elementary-decision
#16
Thomas Meindertsma, Niels A Kloosterman, Guido Nolte, Andreas K Engel, Tobias H Donner
The cerebral cortex continuously undergoes changes in its state, which manifest in transient modulations of the cortical power spectrum. Cortical state changes occur also at full wakefulness, during rapid cognitive acts, such as perceptual decisions. Previous studies found a global modulation of beta-band (12-30 Hz) activity in human and monkey visual cortex during an elementary visual decision: reporting the appearance or disappearance of salient visual targets surrounded by a distractor. The previous studies did neither disentangle the motor action associated with behavioral report, nor other secondary processes, such as arousal, from perceptual decision processing per se...
May 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28491012/are-alpha-2d-adrenoceptor-subtypes-involved-in-rat-mydriasis-evoked-by-new-imidazoline-derivatives-marsanidine-and-7-methylmarsanidine
#17
Joanna Raczak-Gutknecht, Teresa Frąckowiak, Antoni Nasal, Anita Kornicka, Franciszek Sączewski, Roman Kaliszan
The imidazoline compounds may produce mydriasis after systemic administration to some species (rats, cats, and mice). In mydriatic activity of imidazolines, α2D-adrenoceptors subtype(s) seems to be involved. In this study, the pupil dilatory effect evoked by 2 newly synthesized imidazoline derivatives-α2-adrenoceptor agonists: marsanidine and 7-methylmarsanidine-was compared. The compounds were tested alone as well as in the presence of α2-adrenoceptor antagonists (nonselective, yohimbine, and selective toward the following α2-adrenoceptor subtypes-α2A-2-[(4,5-dihydro-1H-imidazol-2-yl)methyl]-2,3-dihydro-1-methyl-1H-isoindole maleate (BRL44408), α2B-2-[2-(4-(2-methoxyphenyl)piperazin-1-yl)ethyl]-4,4-dimethyl-1,3-(2H,4H)-isoquinolindione dihydrochloride (ARC239), α2C-JP1302, α2D-2-(2,3-dihydro-2-methoxy-1,4-benzodioxin-2-yl)-4,5-dihydro-1H-imidazole hydrochloride [RX821002])...
April 2017: Dose-response: a Publication of International Hormesis Society
https://www.readbyqxmd.com/read/28489642/pupillary-reflex-for-evaluation-of-thoracic-paravertebral-block-a-prospective-observational-feasibility-study
#18
Baptiste Duceau, Mélanie Baubillier, Gaëlle Bouroche, Aline Albi-Feldzer, Christian Jayr
BACKGROUND: Although thoracic paravertebral block (TPVB) is recommended in major breast surgery, there is no gold standard to assess the success of TPVB. Pupillary dilation reflex (PDR) is the variation of the pupillary diameter after a noxious stimulus. The objective was to evaluate the feasibility of recording the PDR to assess analgesia in an anesthetized thoracic dermatome after TPVB. METHODS: This prospective, observational, single-center study included 32 patients requiring breast surgery under general anesthesia and TPVB...
May 4, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28489506/prehospital-intubation-is-associated-with-favorable-outcomes-and-lower-mortality-in-protect-iii
#19
Kurt R Denninghoff, Tomas Nuño, Qi Pauls, Sharon D Yeatts, Robert Silbergleit, Yuko Y Palesch, Lisa H Merck, Geoff T Manley, David W Wright
OBJECTIVE: Traumatic brain injury (TBI) causes more than 2.5 million emergency department visits, hospitalizations, or deaths annually. Prehospital endotracheal intubation has been associated with poor outcomes in patients with TBI in several retrospective observational studies. We evaluated the relationship between prehospital intubation, functional outcomes, and mortality using high quality data on clinical practice collected prospectively during a randomized multicenter clinical trial...
May 10, 2017: Prehospital Emergency Care
https://www.readbyqxmd.com/read/28488950/is-ross-syndrome-an-autoimmune-entity-a-case-series-of-11-patients
#20
Ajay Kumar Mishra, Meban Kharkongor, Cijoy K Kuriakose, Anu Anna George, Dincy Peter, Ronal Albert Benton Carey, Vivek Mathew, Samuel George Hansdak
BACKGROUND: Ross syndrome is diagnosed by the presence of segmental anhidrosis, areflexia, and tonic pupils. Fewer than 60 cases have been described in literature so far. There have been reports of presence of antibodies in such patients, suggesting an autoimmune pathogenesis. METHODS: We describe the clinical profile in this case series of 11 patients with Ross syndrome and discuss the current status of autoimmunity in its pathogenesis and the management. RESULTS: Of the 11 patients with Ross syndrome there was an almost equal sex distribution (male:female ratio was 1...
May 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
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