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https://www.readbyqxmd.com/read/28207786/hearing-flashes-and-seeing-beeps-timing-audiovisual-events
#1
Manuel Vidal
Many events from daily life are audiovisual (AV). Handclaps produce both visual and acoustic signals that are transmitted in air and processed by our sensory systems at different speeds, reaching the brain multisensory integration areas at different moments. Signals must somehow be associated in time to correctly perceive synchrony. This project aims at quantifying the mutual temporal attraction between senses and characterizing the different interaction modes depending on the offset. In every trial participants saw four beep-flash pairs regularly spaced in time, followed after a variable delay by a fifth event in the test modality (auditory or visual)...
2017: PloS One
https://www.readbyqxmd.com/read/28207350/shifting-attention-between-visual-dimensions-as-a-source-of-switch-costs
#2
Heike Elchlepp, Maisy Best, Aureliu Lavric, Stephen Monsell
Task-switching experiments have documented a puzzling phenomenon: Advance warning of the switch reduces but does not eliminate the switch cost. Theoretical accounts have posited that the residual switch cost arises when one selects the relevant stimulus-response mapping, leaving earlier perceptual processes unaffected. We put this assumption to the test by seeking electrophysiological markers of encoding a perceptual dimension. Participants categorized a colored letter as a vowel or consonant or its color as "warm" or "cold...
February 1, 2017: Psychological Science
https://www.readbyqxmd.com/read/28206671/surgery-for-cataracts-in-people-with-age-related-macular-degeneration
#3
REVIEW
Heather Casparis, Kristina Lindsley, Irene C Kuo, Shameema Sikder, Neil M Bressler
BACKGROUND: Cataract and age-related macular degeneration (AMD) are common causes of decreased vision that often occur simultaneously in people over age 50. Although cataract surgery is an effective treatment for cataract-induced visual loss, some clinicians suspect that such an intervention may increase the risk of worsening of underlying AMD and thus have deleterious effects on vision. OBJECTIVES: The objective of this review was to evaluate the effectiveness and safety of cataract surgery compared with no surgery in eyes with AMD...
February 16, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28198413/pre-encoding-gamma-band-activity-during-auditory-working-memory
#4
Jochen Kaiser, Maria Rieder, Cornelius Abel, Benjamin Peters, Christoph Bledowski
Previous magnetoencephalography (MEG) studies have revealed gamma-band activity at sensors over parietal and fronto-temporal cortex during the delay phase of auditory spatial and non-spatial match-to-sample tasks, respectively. While this activity was interpreted as reflecting the memory maintenance of sound features, we noted that task-related activation differences might have been present already prior to the onset of the sample stimulus. The present study focused on the interval between a visual cue indicating which sound feature was to be memorized (lateralization or pitch) and sample sound presentation to test for task-related activation differences preceding stimulus encoding...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193822/comparative-system-identification-of-flower-tracking-performance-in-three-hawkmoth-species-reveals-adaptations-for-dim-light-vision
#5
Anna L Stöckl, Klara Kihlström, Steven Chandler, Simon Sponberg
Flight control in insects is heavily dependent on vision. Thus, in dim light, the decreased reliability of visual signal detection also prompts consequences for insect flight. We have an emerging understanding of the neural mechanisms that different species employ to adapt the visual system to low light. However, much less explored are comparative analyses of how low light affects the flight behaviour of insect species, and the corresponding links between physiological adaptations and behaviour. We investigated whether the flower tracking behaviour of three hawkmoth species with different diel activity patterns revealed luminance-dependent adaptations, using a system identification approach...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28193818/processing-of-single-photon-responses-in-the-mammalian-on-and-off-retinal-pathways-at-the-sensitivity-limit-of-vision
#6
Daisuke Takeshita, Lina Smeds, Petri Ala-Laurila
Visually guided behaviour at its sensitivity limit relies on single-photon responses originating in a small number of rod photoreceptors. For decades, researchers have debated the neural mechanisms and noise sources that underlie this striking sensitivity. To address this question, we need to understand the constraints arising from the retinal output signals provided by distinct retinal ganglion cell types. It has recently been shown in the primate retina that On and Off parasol ganglion cells, the cell types likely to underlie light detection at the absolute visual threshold, differ fundamentally not only in response polarity, but also in the way they handle single-photon responses originating in rods...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28190673/interplay-between-supramodal-attentional-control-and-capacity-limits-in-the-low-level-visual-processors-modulate-the-tendency-to-inattention
#7
Massimiliano Papera, Anne Richards
When engaged in a demanding task, individuals may neglect unexpected visual stimuli presented concomitantly. Here we use a change detection task to show that propensity to inattention is associated with a flexible allocation of attentional resources to filter and represent visual information. This was reflected by N2 posterior contralateral (N2pc) and contralateral delay activity (CDA) respectively, but also during high-order reorienting of attentional resources (known as anterior directing attention negativity, ADAN)...
February 9, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28188916/how-action-selection-influences-the-sense-of-agency-an-erp-study
#8
Nura Sidarus, Matti Vuorre, Patrick Haggard
Sense of agency (SoA) refers to the feeling that we are in control of our actions and, through them, of events in the outside world. One influential view claims that the SoA depends on retrospectively matching the expected and actual outcomes of action. However, recent studies have revealed an additional, prospective component to SoA, driven by action selection processes. We used event-related potentials (ERPs) to clarify the neural mechanisms underlying prospective agency. Subliminal priming was used to manipulate the fluency of selecting a left or right hand action in response to a supraliminal target...
February 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28187205/an-event-related-potential-study-of-ihibitory-and-attentional-control-in-williams-syndrome-adults
#9
Joanna M H Greer, Colin Hamilton, Mhairi E G McMullon, Deborah M Riby, Leigh M Riby
The primary aim of the current study was to employ event-related potentials (ERPs) methodology to disentangle the mechanisms related to inhibitory control in older adults with Williams syndrome (WS). Eleven older adults with WS (mean age 42), 16 typically developing adults (mean age 42) and 13 typically developing children (mean age 12) participated in the study. ERPs were recorded during a three-stimulus visual oddball task, during which participants were required to make a response to a rare target stimulus embedded in a train of frequent non-target stimuli...
2017: PloS One
https://www.readbyqxmd.com/read/28176434/network-level-assessment-of-reward-related-activation-in-patients-with-adhd-and-healthy-individuals
#10
Daniel von Rhein, Christian F Beckmann, Barbara Franke, Jaap Oosterlaan, Dirk J Heslenfeld, Pieter J Hoekstra, Catharina A Hartman, Marjolein Luman, Stephen V Faraone, Roshan Cools, Jan K Buitelaar, Maarten Mennes
INTRODUCTION: Reward processing is a key aspect of cognitive control processes, putatively instantiated by mesolimbic and mesocortical brain circuits. Deficient signaling within these circuits has been associated with psychopathology. We applied a network discovery approach to assess specific functional networks associated with reward processing in participants with attention-deficit/hyperactivity disorder (ADHD). METHODS: To describe task-related processes in terms of integrated functional networks, we applied independent component analysis (ICA) to task response maps of 60 healthy participants who performed a monetary incentive delay (MID) task...
February 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28164676/elevated-ccl2-mcp-1-levels-are-related-to-disease-severity-in-postmenopausal-osteoporotic-patients
#11
Xian-Wen Yang, Xue-Si Wang, Fu-Bin Cheng, Fei Wang, Lei Wan, Fang Wang, Hong-Xing Huang
BACKGROUND: Chemokine (C-C) ligand-2 (CCL2), also named monocyte chemoattractant protein 1 (MCP-1), is an important chemotactic factor involved in a wide range of diseases. Recent studies have shown that CCL2/MCP-1 plays crucial roles in the osteoclastogenic process. The current study was performed to measure serum CCL2 levels in postmenopausal osteoporotic patients and investigate the relationship between CCL2 concentrations in serum and disease severity in postmenopausal osteoporotic patients...
November 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28152943/applying-value-stream-mapping-to-improve-patient-flow-and-satisfaction
#12
Rob Kenney, Katherine Glass, Emily Elizabeth Monteleone, Brian James Bolwell
: 244 Background: Value Stream Mapping (VSM) is a tool commonly used in manufacturing environments to analyze the current state process and to design an improved future state. VSM is a dynamic visual management tool that can be applied in the context of clinical activities to identify value-added (VA) and non-value added (NVA) activities along the spectrum of patient care. A VSM was created for the Breast Cancer Program to identify improvement opportunities in patient quality, flow, and communication across disciplines...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28138426/alterations-in-visual-cortical-activation-and-connectivity-with-prefrontal-cortex-during-working-memory-updating-in-major-depressive-disorder
#13
Thang M Le, John A Borghi, Autumn J Kujawa, Daniel N Klein, Hoi-Chung Leung
The present study examined the impacts of major depressive disorder (MDD) on visual and prefrontal cortical activity as well as their connectivity during visual working memory updating and related them to the core clinical features of the disorder. Impairment in working memory updating is typically associated with the retention of irrelevant negative information which can lead to persistent depressive mood and abnormal affect. However, performance deficits have been observed in MDD on tasks involving little or no demand on emotion processing, suggesting dysfunctions may also occur at the more basic level of information processing...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28125585/the-flash-lag-effect-as-a-motion-based-predictive-shift
#14
Mina A Khoei, Guillaume S Masson, Laurent U Perrinet
Due to its inherent neural delays, the visual system has an outdated access to sensory information about the current position of moving objects. In contrast, living organisms are remarkably able to track and intercept moving objects under a large range of challenging environmental conditions. Physiological, behavioral and psychophysical evidences strongly suggest that position coding is extrapolated using an explicit and reliable representation of object's motion but it is still unclear how these two representations interact...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28119401/electrical-microstimulation-of-the-pulvinar-biases-saccade-choices-and-reaction-times-in-a-time-dependent-manner
#15
Adan-Ulises Dominguez-Vargas, Lukas Schneider, Melanie Wilke, Igor Kagan
: The pulvinar complex is extensively interconnected with brain regions involved in spatial processing and eye movement control. Recent inactivation studies have shown that the dorsal pulvinar plays a role in saccade target selection. However, it remains unknown whether it exerts effects on visual processing or at planning/execution stages. We employed electrical microstimulation of the dorsal pulvinar while monkeys performed saccade tasks towards instructed and freely-chosen targets...
January 24, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28117958/photoinduced-electron-transfer-process-visualized-on-single-silver-nanoparticles
#16
Gang Lei, Peng Fei Gao, Tong Yang, Jun Zhou, Hong Zhi Zhang, Shan Shan Sun, Ming Xuan Gao, Cheng Zhi Huang
Understanding photoinduced electron transfer (PET) mechanism is vital to improving the photoelectric conversion efficiency for solar energy materials and photosensitization systems. Herein we visually demonstrated the PET process by real-time monitoring the photoinduced chemical transformation (PICT) of para-aminothiophenol (p-ATP), an important SERS signal molecule, to 4,4'-dimercaptoazobenzene (DMAB) on single silver nanoparticles (AgNPs) with a localized surface plasmon resonance (LSPR) spectroscopy coupled dark-field microscopy...
January 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28114062/delay-and-standard-deviation-beamforming-to-enhance-specular-reflections-in-ultrasound-imaging
#17
Raja Sekhar Bandaru, Anders Sornes, Jeroen Hermans, Eigil Samset, Jan D'hooge
Although interventional devices such as needles, guide wires and catheters are best visualized by X-ray, real-time volumetric echography could offer an attractive alternative as it avoids ionizing radiation; it provides good soft tissue contrast and it is mobile and relatively cheap. Unfortunately, as echography is traditionally used to image soft tissue and blood flow, the appearance of interventional devices in conventional ultrasound images remains relatively poor which is a major obstacle towards ultrasound-guided interventions...
September 27, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28108852/missing-the-target-the-neural-processing-underlying-the-omission-error
#18
Rinaldo Livio Perri, Donatella Spinelli, Francesco Di Russo
The omissions are infrequent errors consisting in missing responses to the target stimuli. This is the first study aimed at investigating the brain activities associated with omissions in a decision-making task. We recorded event-related potentials (ERPs) in 12 subjects which reported a suitable number of omissions in a visual go/no-go task. We investigated both the pre- and post-stimulus brain activities associated with correct and omitted trials. The electrical neuroimaging technique (BESA) was adopted to extract the anterior insula (aIns) activity associated with the prefrontal P2 component (pP2) peaking about 300 ms after the stimulus and reflecting the stimulus-response mapping process...
January 20, 2017: Brain Topography
https://www.readbyqxmd.com/read/28100737/selectivity-in-postencoding-connectivity-with-high-level-visual-cortex-is-associated-with-reward-motivated-memory
#19
Vishnu P Murty, Alexa Tompary, R Alison Adcock, Lila Davachi
: Reward motivation has been demonstrated to enhance declarative memory by facilitating systems-level consolidation. Although high-reward information is often intermixed with lower reward information during an experience, memory for high value information is prioritized. How is this selectivity achieved? One possibility is that postencoding consolidation processes bias memory strengthening to those representations associated with higher reward. To test this hypothesis, we investigated the influence of differential reward motivation on the selectivity of postencoding markers of systems-level memory consolidation...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28089696/differential-sensory-cortical-involvement-in-auditory-and-visual-sensorimotor-temporal-recalibration-evidence-from-transcranial-direct-current-stimulation-tdcs
#20
Ali Aytemür, Nathalia Almeida, Kwang-Hyuk Lee
Adaptation to delayed sensory feedback following an action produces a subjective time compression between the action and the feedback (temporal recalibration effect, TRE). TRE is important for sensory delay compensation to maintain a relationship between causally related events. It is unclear whether TRE is a sensory modality-specific phenomenon. In 3 experiments employing a sensorimotor synchronization task, we investigated this question using cathodal transcranial direct-current stimulation (tDCS). We found that cathodal tDCS over the visual cortex, and to a lesser extent over the auditory cortex, produced decreased visual TRE...
February 2017: Neuropsychologia
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