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https://www.readbyqxmd.com/read/29166387/effects-of-total-sleep-deprivation-on-divided-attention-performance
#1
Eric Chern-Pin Chua, Eric Fang, Joshua J Gooley
Dividing attention across two tasks performed simultaneously usually results in impaired performance on one or both tasks. Most studies have found no difference in the dual-task cost of dividing attention in rested and sleep-deprived states. We hypothesized that, for a divided attention task that is highly cognitively-demanding, performance would show greater impairment during exposure to sleep deprivation. A group of 30 healthy males aged 21-30 years was exposed to 40 h of continuous wakefulness in a laboratory setting...
2017: PloS One
https://www.readbyqxmd.com/read/29165417/-pterygium-etiology-pathogenesis-treatment
#2
S A Malozhen, S V Trufanov, D A Krakhmaleva
Pterygium is a degenerative condition characterized by fibrovascular outgrowth of conjunctiva over the cornea. Many theories exist that try to explain its pathogenesis. The current belief is that this disease is multifactorial with ultraviolet radiation being the most important trigger. Attention is also paid to such factors as tear film changes, cytokines and growth factors disbalance, immunologic disturbances, genetic mutations, and viral infections. Modern classifications consider the rate of fibrovascular growth, its progressive potential, and histological features...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/29165401/systematic-overview-of-bacopa-monnieri-l-wettst-dominant-poly-herbal-formulas-in-children-and-adolescents
#3
REVIEW
James D Kean, Luke A Downey, Con Stough
Background: The Ayurvedic medicinal system employs a holistic approach to health, utilising the synergistic properties of organic resources. Research into the Ayurvedic herb Bacopa monnieri (L.) Wettst. (B.monnieri) has reported improvements in cognitive outcomes in child and adult populations. The aim of current review is to systematically assess and critically summarize clinical trials investigating B.monnieri-dominant poly-herbal formulas and their effects on the cognition, memory, learning, and behaviour in children and adolescents...
November 22, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/29164522/prioritization-to-visual-objects-roles-of-sensory-uncertainty
#4
Ting Luo, Xia Wu, Hailing Wang, Shimin Fu
Two hypotheses, attentional prioritization and attentional spreading, have been proposed to account for object-based attention. The attentional-prioritization hypothesis posits that the positional uncertainty of targets is sufficient to resolve the controversy raised by the competing attentional-spreading hypothesis. Here we challenge the sufficiency of this explanation by showing that object-based attention is a function of sensory uncertainty in a task with consistent high positional uncertainty of the targets...
November 21, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/29164280/functional-brain-networks-involved-in-decision-making-under-certain-and-uncertain-conditions
#5
Danielle C Farrar, Asim Z Mian, Andrew E Budson, Mark B Moss, Ronald J Killiany
PURPOSE: The aim of this study was to describe imaging markers of decision-making under uncertain conditions in normal individuals, in order to provide baseline activity to compare to impaired decision-making in pathological states. METHODS: In this cross-sectional study, 19 healthy subjects ages 18-35 completed a novel decision-making card-matching task using a Phillips T3 Scanner and a 32-channel head coil. Functional data were collected in six functional runs...
November 21, 2017: Neuroradiology
https://www.readbyqxmd.com/read/29163278/can-limitations-of-visuospatial-attention-be-circumvented-a-review
#6
REVIEW
Basil Wahn, Peter König
In daily life, humans are bombarded with visual input. Yet, their attentional capacities for processing this input are severely limited. Several studies have investigated factors that influence these attentional limitations and have identified methods to circumvent them. Here, we provide a review of these findings. We first review studies that have demonstrated limitations of visuospatial attention and investigated physiological correlates of these limitations. We then review studies in multisensory research that have explored whether limitations in visuospatial attention can be circumvented by distributing information processing across several sensory modalities...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29163131/task-irrelevant-novel-sounds-have-antithetical-effects-on-visual-target-processing-in-young-and-old-adults
#7
Erich S Tusch, Nicole C Feng, Phillip J Holcomb, Kirk R Daffner
In young adults, primary visual task processing can be either enhanced or disrupted by novel auditory stimuli preceding target events, depending on task demands. Little is known about this phenomenon in older individuals, who, in general, are more susceptible to distraction. In the current study, age-related differences in the electrophysiological effects of task-irrelevant auditory stimuli on visual target processing were examined. Under both low and high primary task loads, the categorization/updating process in response to visual targets preceded by auditory novels, as indexed by the target P3 component, was enhanced in young, but diminished in old adults...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29163099/a-computational-analysis-of-neural-mechanisms-underlying-the-maturation-of-multisensory-speech-integration-in-neurotypical-children-and-those-on-the-autism-spectrum
#8
Cristiano Cuppini, Mauro Ursino, Elisa Magosso, Lars A Ross, John J Foxe, Sophie Molholm
Failure to appropriately develop multisensory integration (MSI) of audiovisual speech may affect a child's ability to attain optimal communication. Studies have shown protracted development of MSI into late-childhood and identified deficits in MSI in children with an autism spectrum disorder (ASD). Currently, the neural basis of acquisition of this ability is not well understood. Here, we developed a computational model informed by neurophysiology to analyze possible mechanisms underlying MSI maturation, and its delayed development in ASD...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29163062/difference-in-perseverative-errors-during-a-visual-attention-task-with-auditory-distractors-in-alpha-9-nicotinic-receptor-subunit-wild-type-and-knock-out-mice
#9
Pascal Jorratt, Paul H Delano, Carolina Delgado, Alexies Dagnino-Subiabre, Gonzalo Terreros
The auditory efferent system is a neural network that originates in the auditory cortex and projects to the cochlear receptor through olivocochlear (OC) neurons. Medial OC neurons make cholinergic synapses with outer hair cells (OHCs) through nicotinic receptors constituted by α9 and α10 subunits. One of the physiological functions of the α9 nicotinic receptor subunit (α9-nAChR) is the suppression of auditory distractors during selective attention to visual stimuli. In a recent study we demonstrated that the behavioral performance of alpha-9 nicotinic receptor knock-out (KO) mice is altered during selective attention to visual stimuli with auditory distractors since they made less correct responses and more omissions than wild type (WT) mice...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29162899/remapping-high-capacity-pre-attentive-fragile-sensory-memory
#10
Paul Zerr, Surya Gayet, Kees Mulder, Yaïr Pinto, Ilja Sligte, Stefan Van der Stigchel
Humans typically make several saccades per second. This provides a challenge for the visual system as locations are largely coded in retinotopic (eye-centered) coordinates. Spatial remapping, the updating of retinotopic location coordinates of items in visuospatial memory, is typically assumed to be limited to robust, capacity-limited and attention-demanding working memory (WM). Are pre-attentive, maskable, sensory memory representations (e.g. fragile memory, FM) also remapped? We directly compared trans-saccadic WM (tWM) and trans-saccadic FM (tFM) in a retro-cue change-detection paradigm...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29162459/eeg-neurofeedback-training-of-beta-band-12-22hz-affects-alpha-and-beta-frequencies-a-controlled-study-of-a-healthy-population
#11
Katarzyna Jurewicz, Katarzyna Paluch, Ewa Kublik, Jacek Rogala, Mirosław Mikicin, Andrzej Wróbel
The frequency-function relation of various EEG bands has inspired EEG-neurofeedback procedures intending to improve cognitive abilities in numerous clinical groups. In this study, we administered EEG-neurofeedback (EEG-NFB) to a healthy population to determine the efficacy of this procedure. We evaluated feedback manipulation in the beta band (12-22Hz), known to be involved in visual attention processing. Two groups of healthy adults were trained to either up- or down-regulate beta band activity mutual control...
November 18, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29162458/electrophysiological-impact-of-multiple-concussions-in-asymptomatic-athletes-a-re-analysis-based-on-alpha-activity-during-a-visual-spatial-attention-task
#12
Samuel Guay, Louis De Beaumont, Brandi Lee Drisdelle, Jean-Marc Lina, Pierre Jolicoeur
Most EEG studies used event-related potentials to assess long-term and cumulative effects of sport-related concussions on brain activity. Time-frequency methods provide another approach that allows the detection of subtle shifts in types and patterns of brain oscillations. We sought to discover whether event-related alpha activity would be significantly affected in asymptomatic multi-concussed athletes. We measured the amplitude of alpha activity (8-12Hz) from the EEG recorded during a visual-spatial attention task to compare event-related alpha perturbations in 13 multi-concussed athletes and 14 age-equivalent, non-concussed teammates...
November 18, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29160536/use-of-the-ishikawa-diagram-in-a-case-control-analysis-to-assess-the-causes-of-a-diffuse-lamellar-keratitis-outbreak
#13
Luis Henrique Lira, Flávio E Hirai, Marivaldo Oliveira, Waldir Portellinha, Eliane Mayumi Nakano
PURPOSE: To identify the causes of a diffuse lamellar keratitis (DLK) outbreak using a systematic search tool in a case-control analysis. METHODS: An Ishikawa diagram was used to guide physicians to determine the potential risk factors involved in this outbreak. Coherence between the occurrences and each possible cause listed in the diagram was verified, and the total number of eyes at risk was used to calculate the proportion of affected eyes. Multivariate analysis was performed using logistic regression to determine the independent effect of the risk factors, after controlling for confounders and test interactions...
September 2017: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/29159798/tasks-determine-what-is-learned-in-visual-statistical-learning
#14
Timothy J Vickery, Su Hyoun Park, Jayesh Gupta, Marian E Berryhill
Visual statistical learning (VSL), the unsupervised learning of statistical contingencies across time and space, may play a key role in efficient and predictive encoding of the perceptual world. How VSL capabilities vary as a function of ongoing task demands is still poorly understood. VSL is modulated by selective attention and faces interference from some secondary tasks, but there is little evidence that the types of contingencies learned in VSL are sensitive to task demands. We found a powerful effect of task on what is learned in VSL...
November 20, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/29157845/face-perception-in-social-anxiety-visuocortical-dynamics-reveal-propensities-for-hypervigilance-or-avoidance
#15
Lisa M McTeague, Marie-Claude Laplante, Hailey W Bulls, Joshua R Shumen, Peter J Lang, Andreas Keil
BACKGROUND: Theories of aberrant attentional processing in social anxiety, and anxiety disorders more broadly, have postulated an initial hypervigilance or facilitation to clinically relevant threats and consequent defensive avoidance. However, existing objective measurements utilized to explore this phenomenon lack the resolution to elucidate attentional dynamics, particularly covert influences. METHODS: We utilized a continuous measure of visuocortical engagement, the steady-state visual evoked potential in response to naturalistic angry, fearful, happy, and neutral facial expressions...
October 13, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/29157420/learning-features-in-a-complex-and-changing-environment-a-distribution-based-framework-for-visual-attention-and-vision-in-general
#16
Andrey Chetverikov, Gianluca Campana, Árni Kristjánsson
What are the building blocks of our visual representations? Whatever we look at, the things we see will have some feature variability: even snow is not purely white but has a range of shades of white. However, in most studies investigating visual perception, homogeneous displays with all stimuli having a very limited range of features have been used. In contrast, recent studies using heterogeneous displays have shown that our perceptual system encodes surprisingly detailed information about stimuli, representing parameters such as the mean, variance, and most importantly the probability density functions of feature distributions...
2017: Progress in Brain Research
https://www.readbyqxmd.com/read/29157417/effect-of-emotions-on-temporal-attention
#17
Maruti V Mishra, Sonia B Ray, Narayanan Srinivasan
Emotions play a significant role in guiding everyday actions and strongly interact with attention. The processing of emotional information over time and the influence of attention on such processing has been studied through the phenomenon of attentional blink using rapid serial visual presentations (RSVP) tasks. This chapter discusses the interaction between temporal attention and the type of emotional information (words, scenes, and facial expressions) presented during or before the RSVP stream. The findings show that the affective content and the arousal value of the emotional stimuli presented as first target, second target, or both affects the magnitude and the duration of the blink window...
2017: Progress in Brain Research
https://www.readbyqxmd.com/read/29157415/attention-in-action-and-perception-unitary-or-separate-mechanisms-of-selectivity
#18
James T Enns, Allison A Brennan, Robert L Whitwell
What is the relation between the two visual stream hypothesis and selective visual attention? In this chapter, we first consider this question at a theoretical level before presenting an example of work from our lab that examines the question: Under what conditions does the emotional content of a visual object influence visually guided action? Previous research has demonstrated that fear can influence perception, both consciously and unconsciously, but it is unclear when fear influences visually guided action...
2017: Progress in Brain Research
https://www.readbyqxmd.com/read/29157407/oculomotor-measures-reveal-the-temporal-dynamics-of-preparing-for-search
#19
Katya Olmos-Solis, Anouk M van Loon, Sander A Los, Christian N L Olivers
Theories of visual search assume that selection is driven by an active template representation of the target object. Earlier studies suggest that template activation occurs prior to search, but the temporal dynamics of such preactivation remain unclear. Two experiments employed microsaccades to track both general preparation (i.e., anticipation of the search task as such) and template-specific preparation (i.e., anticipation of target selection) of visual search. Participants memorized a target color (i.e., the template) for an upcoming search task...
2017: Progress in Brain Research
https://www.readbyqxmd.com/read/29157339/concurrent-pilot-instrument-monitoring-in-the-automated-multi-crew-airline-cockpit
#20
Stephen R Jarvis
INTRODUCTION: Pilot instrument monitoring has been described as "inadequate," "ineffective," and "insufficient" after multicrew aircraft accidents. Regulators have called for improved instrument monitoring by flight crews, but scientific knowledge in the area is scarce. Research has tended to investigate the monitoring of individual pilots when in the pilot-flying role; very little research has looked at crew monitoring, or that of the "monitoring-pilot" role despite it being half of the apparent problem...
December 1, 2017: Aerospace Medicine and Human Performance
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