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Visual perception

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https://www.readbyqxmd.com/read/28823075/refractive-corneal-and-ocular-residual-astigmatism-distribution-in-a-german-population-and-age-dependency-the-gutenberg-health-study
#1
Alexander Karl-Georg Schuster, Norbert Pfeiffer, Andreas Schulz, René Hoehn, Katharina A Ponto, Philipp S Wild, Maria Blettner, Manfred E Beutel, Karl J Lackner, Thomas Münzel, Alireza Mirshahi
PURPOSE: Worldwide, the most frequent cause of visual impairment is uncorrected refractive error. This analysis focused on the distribution and associations of refractive, corneal and ocular residual astigmatism. METHODS: As part of the Gutenberg Health study, a population-based cross-sectional study was conducted in the general population of Germany. A comprehensive ophthalmological examination including refraction, tonometry, and Scheimpflug imaging of the anterior cornea (Pachycam) was performed...
August 19, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28822677/dentoskeletal-parameters-related-to-visual-perception-of-facial-asymmetry-in-patients-with-skeletal-class-iii-malocclusion-after-orthognathic-surgery
#2
C-W Lin, Y-C Wang, Y-H Chen, E W-C Ko
The purpose of the study is to explore the critical parameters determining the visual perception of postoperative facial symmetry. This study retrospectively included 24 patients with skeletal class III malocclusion and double-jaw orthognathic surgery (OgS). The patients were classified according to the outcome of subjective visual perception scores (SVPS) based on the postoperative frontal images by 10 orthodontists: symmetrical surgical outcome (S group, n=12) and facial asymmetry after surgery (A group, n=12)...
August 16, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28821774/pre-coincidence-brain-activity-predicts-the-perceptual-outcome-of-streaming-bouncing-motion-display
#3
Song Zhao, Yajie Wang, Lina Jia, Chengzhi Feng, Yu Liao, Wenfeng Feng
When two identical visual discs move toward each other on a two-dimensional visual display, they can be perceived as either "streaming through" or "bouncing off" each other after their coincidence. Previous studies have observed a strong bias toward the streaming percept. Additionally, the incidence of the bouncing percept in this ambiguous display could be increased by various factors, such as a brief sound at the moment of coincidence and a momentary pause of the two discs. The streaming/bouncing bistable motion phenomenon has been studied intensively since its discovery...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821653/human-occipital-and-parietal-gaba-selectively-influence-visual-perception-of-orientation-and-size
#4
Chen Song, Kristian Sandberg, Lau Møller Andersen, Jakob Udby Blicher, Geraint Rees
Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in human brain. GABA level varies substantially across individuals and this variability is associated with inter-individual differences in visual perception. However, it remains unclear whether the association between GABA level and visual perception reflects a general influence of visual inhibition, or whether GABA level of different cortical regions selectively influences perception of different visual features. To address this, we studied how GABA level in parietal and occipital cortices related to inter-individual differences in size, orientation, and brightness perception, in a group of healthy young male participants...
August 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821647/plasticity-beyond-v1-reinforcement-of-motion-perception-upon-binocular-central-retinal-lesions-in-adulthood
#5
Kalina Burnat, Tjing-Tjing Hu, Małgorzata Kossut, Ulf T Eysel, Lutgarde Arckens
Induction of a central retinal lesion in both eyes of adult mammals is a model for macular degeneration and leads to retinotopic map reorganization in the primary visual cortex (V1). Here we characterized the spatio-temporal dynamics of molecular activity levels in the central and peripheral representation of five higher order visual areas, V2/18, V3/19, V4/21a,V5/PMLS, area 7, and V1/17, in adult cats with central 10° retinal lesions (both sexes), by means of real-time PCR for the neuronal activity reporter gene zif268...
August 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28820172/timing-of-surgery-in-traumatic-globe-dislocation
#6
Md Shahid Alam, Olma Veena Noronha, Bipasha Mukherjee
Traumatic globe dislocation into the maxillary sinus is a rare event and usually associated with a poor visual outcome if not managed appropriately. We report a 45-year-old female patient who presented to the emergency after blunt injury to her face with a door. Initial evaluation revealed nil perception of light and an apparently anophthalmic socket. Neuroimaging revealed large floor and medial wall fracture with dislocation of the globe into the maxillary sinus. The patient underwent exploration with repositioning of the globe and fracture repair...
August 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28819078/-associative-learning-between-orientation-and-color-in-early-visual-areas
#7
Kaoru Amano, Kazuhisa Shibata, Mitsuo Kawato, Yuka Sasaki, Takeo Watanabe
Associative learning is an essential neural phenomenon where the contingency of different items increases after training. Although associative learning has been found to occur in many brain regions, there is no clear evidence that associative learning of visual features occurs in early visual areas. Here, we developed an associative decoded functional magnetic resonance imaging (fMRI) neurofeedback (A-DecNef) to determine whether associative learning of color and orientation can be induced in early visual areas...
August 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/28818944/conversion-of-object-identity-to-object-general-semantic-value-in-the-primate-temporal-cortex
#8
Keita Tamura, Masaki Takeda, Rieko Setsuie, Tadashi Tsubota, Toshiyuki Hirabayashi, Kentaro Miyamoto, Yasushi Miyashita
At the final stage of the ventral visual stream, perirhinal neurons encode the identity of memorized objects through learning. However, it remains elusive whether and how object percepts alone, or concomitantly a nonphysical attribute of the objects ("learned"), are decoded from perirhinal activities. By combining monkey psychophysics with optogenetic and electrical stimulations, we found a focal spot of memory neurons where both stimulations led monkeys to preferentially judge presented objects as "already seen...
August 18, 2017: Science
https://www.readbyqxmd.com/read/28816807/a-whooping-cough-education-module-for-wic-clients-in-utah
#9
Karlen E Luthy, Alicia Anderson, Janelle Macintosh, Renea L Beckstrand, Lacey M Eden, Ryan Amy, Christopher I Macintosh
BACKGROUND: Clients in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) are required to complete education modules quarterly to maintain eligibility. The purposes of this project were to: (1) create a whooping cough vaccination education module for WIC clients; (2) evaluate baseline perceptions of WIC clients on the whooping cough vaccine and disease; and (3) evaluate whooping cough knowledge following completion of the module. PROBLEM: A decline in vaccination rates among infants and children using WIC services was reported by a local WIC program director who requested whooping cough vaccination education materials...
September 2017: MCN. the American Journal of Maternal Child Nursing
https://www.readbyqxmd.com/read/28816479/alternation-blindness-in-the-representation-of-binary-sequences
#10
Ru Qi Yu, Daniel Osherson, Jiaying Zhao
Binary information is prevalent in the environment and contains 2 distinct outcomes. Binary sequences consist of a mixture of alternation and repetition. Understanding how people perceive such sequences would contribute to a general theory of information processing. In this study, we examined how people process alternation and repetition in binary sequences. Across 4 paradigms involving estimation, working memory, change detection, and visual search, we found that the number of alternations is underestimated compared with repetitions (Experiment 1)...
August 17, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28815431/central-peripheral-differences-in-audiovisual-and-visuotactile-event-perception
#11
Yi-Chuan Chen, Daphne Maurer, Terri L Lewis, Charles Spence, David I Shore
We examined audiovisual and visuotactile integration in the central and peripheral visual field using visual fission and fusion illusions induced by sounds or taps. The fission illusion occurs when a single flash is perceived as two flashes if paired with two beeps or taps; the fusion illusion, by contrast, occurs when two flashes are perceived as a single flash if the flashes are paired with a single beep or tap. Beeps and taps induced similar patterns of illusions: the fission illusion was larger in the periphery than in the center, whereas the fusion illusion was larger in the center than in the periphery...
August 16, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28814637/asymmetric-vestibular-stimulation-reveals-persistent-disruption-of-motion-perception-in-unilateral-vestibular-lesions
#12
Roberto Panichi, Mario Faralli, Rosa Bruni, Artemis Kiriakarely, Chiara Occhigrossi, Aldo Ferraresi, Adolfo M Bronstein, Vito Enrico Pettorossi
Self-motion perception was studied in patients with unilateral vestibular lesions (UVL) due to acute vestibular neuritis at 1 week, 4, 8 and 12 months after the acute episode. We assessed vestibularly-mediated self-motion perception by measuring the error in reproducing the position of a remembered visual target at the end of 4 cycles of asymmetric whole-body rotation. The oscillatory stimulus consists of a slow (0.09Hz) and a fast (0.38Hz) half cycle. A large error was present in UVL patients when the slow half cycle was delivered towards the lesion side, but minimal towards the healthy side...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28814635/perception-of-the-dynamic-visual-vertical-during-sinusoidal-linear-motion
#13
Antonella Pomante, Luc P J Selen, W Pieter Medendorp
The vestibular system provides information for spatial orientation. However, this information is ambiguous: because the otoliths sense the gravito-inertial force, they cannot distinguish gravitational and inertial components. As a consequence, prolonged linear acceleration of the head can be interpreted as tilt, referred to as the somatogravic effect. Previous modeling work suggests that the brain disambiguates the otolith signal according to the rules of Bayesian inference, combining noisy canal cues with the a priori assumption that prolonged linear accelerations are unlikely...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28814631/face-percept-formation-in-human-ventral-temporal-cortex
#14
Kai J Miller, Dora Hermes, Franco Pestilli, Gagan S Wig, Jeffrey G Ojemann
Loci in ventral temporal cortex are selectively active while viewing faces and other objects, but it remains unclear whether these areas represent accumulation of simple visual information, or processing of intact percept. We measured broadband electrocorticographic changes from implanted electrodes on the ventral temporal brain surface while showing patients noise-degraded images of faces and houses. In a subset of posterior fusiform gyrus face-selective regions, cortical activity decreased parametrically with noise increase, until the perceptual threshold...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28814042/portable-haptic-device-for-lower-limb-amputee-gait-feedback-assessing-static-and-dynamic-perceptibility
#15
M A B Husman, H F Maqbool, M I Awad, A A Dehghani-Sanij
Loss of joints and severed sensory pathway cause reduced mobility capabilities in lower limb amputees. Although prosthetic devices attempt to restore normal mobility functions, lack of awareness and control of limb placement increase the risk of falling and causing amputee to have high level of visual dependency. Haptic feedback can serve as a cue for gait events during ambulation thus providing sense of awareness of the limb position. This paper presents a wireless wearable skin stretch haptic device to be fitted around the thigh region...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813817/the-effects-of-silent-visuomotor-cueing-on-word-retrieval-in-broca-s-aphasies-a-pilot-study
#16
Klaudia Grechuta, Belen Rubio Bellaster, Rosa Espin Munne, Teresa Usabiaga Bernal, Begona Molina Hervas, Rosa San Segundo, Paul F M J Verschure
About a quarter of stroke patients worldwide suffer serious language disorders such as aphasias. Most common symptoms of Broca's aphasia are word naming disorders which highly impact verbal communication and the quality of life of aphasic patients. In order to recover disturbances in word retrieval, several cueing methods (i.e. phonemic and semantic) have been established to improve lexical access establishing effective language rehabilitation techniques. Based on recent evidence from action-perception theories, which postulate that neural circuits for speech perception and articulation are tightly coupled, in the present work, we propose and investigate an alternative type of cueing using silent articulation-related visual stimuli...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813564/multi-inducer-grouping-for-curve-completion-perceptual-and-computational-exploration
#17
Nir-Cohen Gal, Arad Boaz, Ben-Shahar Ohad
The human visual system excels in object recognition and scene interpretation even in scenes in which some (or even all) observed objects are partially occluded or fragmented. This highly efficient capacity is facilitated by constructive processes of contour completion between inducers to yield the perception of whole objects across gaps. A fundamental problem of the process is when and how the visual system groups different inducers in the visual scene between which completion occurs. Previous studies on this grouping problem, inspired mostly by relatability theory (Kellman & Shipley, 1991), focused on one good continuation condition that dictates whether a given pair of inducers would group together or not...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28812938/unilateral-optic-perineuritis-due-to-nonspecific-orbital-inflammation-a-case-report
#18
Pinar Nalcacioglu, Golge Acaroglu
Nonspecific orbital inflammation is an idiopathic chronic tumor-like inflammation process that usually affects the orbital tissues of both eyes. Isolated optic nerve involvement by an idiopathic inflammatory process is a rare finding. Here, we report a patient with unilateral sudden onset severe orbital pain and headache with visual loss to no light perception that could only be attributed to perineuritis. Radiological findings enabled making the correct diagnosis. Various relevant diagnoses are also discussed...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28812412/an-investigation-into-discharge-visual-perception-and-appearance-concerns-of-prosthetic-eye-wearers
#19
Nicola S Pine, Ian de Terte, Keith R Pine
We investigate prosthetic eye wearers' initial and current concerns about mucoid discharge, visual perception, and appearance, and the reasons for their concerns. A retrospective, cross-sectional study of private practice patients was designed. Participants were 217 experienced prosthetic eye wearers, aged at least 16 years. An anonymous questionnaire was e-mailed or mailed to participants. Descriptive and inferential statistics were used to investigate differences or correlations between variables. Content analysis was used to analyze participants' open responses...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28810973/the-influence-of-combat-experience-on-psychologically-healthy-soldiers-attentiveness-to-environmental-threats
#20
Bethany Ranes, Chris P Long, Stephanie Traynham, Amanda Hayes
INTRODUCTION: In contrast to previous research that has primarily examined how psychological disorders (e.g., post-traumatic stress disorder [PTSD], anxiety) are affected by and affect individuals' threat perceptions, this study examines the relationship between combat experience and threat-monitoring in psychologically healthy Soldiers. Existing research has established how prolonged or intense experiences with war-related stressors can lead individuals to undergo an unconscious fear-conditioning process that affects the circuitry of the prefrontal cortex, hippocampus, amygdala, and anterior cingulate cortex regions of the brain...
July 2017: Military Medicine
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