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https://www.readbyqxmd.com/read/28723578/convolutional-neural-network-based-encoding-and-decoding-of-visual-object-recognition-in-space-and-time
#1
REVIEW
K Seeliger, M Fritsche, U Güçlü, S Schoenmakers, J-M Schoffelen, S E Bosch, M A J van Gerven
Representations learned by deep convolutional neural networks (CNNs) for object recognition are a widely investigated model of the processing hierarchy in the human visual system. Using functional magnetic resonance imaging, CNN representations of visual stimuli have previously been shown to correspond to processing stages in the ventral and dorsal streams of the visual system. Whether this correspondence between models and brain signals also holds for activity acquired at high temporal resolution has been explored less exhaustively...
July 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28723319/the-enduring-challenge-of-advanced-hiv-infection
#2
Nathan Ford, Meg Doherty
No abstract text is available yet for this article.
July 20, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28720109/cancer-related-fatigue-implementing-guidelines-for-optimal-management
#3
Elizabeth J M Pearson, Meg E Morris, Carol E McKinstry
BACKGROUND: Cancer-related fatigue (CRF) is a key concern for people living with cancer and can impair physical functioning and activities of daily living. Evidence-based guidelines for CRF are available, yet inconsistently implemented globally. This study aimed to identify barriers and enablers to applying a cancer fatigue guideline and to derive implementation strategies. METHODS: A mixed-method study explored the feasibility of implementing the CRF guideline developed by the Canadian Association for Psychosocial Oncology (CAPO)...
July 18, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28719229/experiences-using-pre-exposure-prophylaxis-for-safer-conception-among-hiv-serodiscordant-heterosexual-couples-in-the-united-states
#4
Angela R Bazzi, Ashley A Leech, Dea L Biancarelli, Meg Sullivan, Mari-Lynn Drainoni
Antiretroviral pre-exposure prophylaxis (PrEP) is a promising HIV prevention strategy for HIV serodiscordant couples (HIV-infected male, uninfected female) seeking safer conception. However, most research on PrEP for safer conception has focused on couples in sub-Saharan Africa; little is known about the perspectives or experiences of heterosexual couples in the United States. We conducted qualitative interviews with six couples (six women and five of their male partners) receiving PrEP for conception services at an urban safety net hospital in the US Northeast...
July 18, 2017: AIDS Patient Care and STDs
https://www.readbyqxmd.com/read/28717920/mother-and-adolescent-eating-in-the-context-of-food-insecurity-findings-from-urban-public-housing
#5
Meg Bruening, Joanna Lucio, Stephanie Brennhofer
Introduction Anecdotal evidence suggests that parents protect their children from food insecurity and its effects, but few studies have concurrently assessed food insecurity among youth and parents. The purpose of this study was to examine food insecurity and eating behaviors among an urban sample of mother-adolescent dyads. Methods Mother-adolescent dyads (n = 55) were from six public housing sites in Phoenix, Arizona who completed surveys during 2014. Multivariate mixed linear and logistic regression models assessed the relationship between mother and adolescent eating behaviors in the context of food insecurity...
July 17, 2017: Maternal and Child Health Journal
https://www.readbyqxmd.com/read/28716718/multivariate-pattern-analysis-of-meg-and-eeg-a-comparison-of-representational-structure-in-time-and-space
#6
Radoslaw Martin Cichy, Dimitrios Pantazis
Multivariate pattern analysis of magnetoencephalography (MEG) and electroencephalography (EEG) data can reveal the rapid neural dynamics underlying cognition. However, MEG and EEG have systematic differences in sampling neural activity. This poses the question to which degree such measurement differences consistently bias the results of multivariate analysis applied to MEG and EEG activation patterns. To investigate, we conducted a concurrent MEG/EEG study while participants viewed images of everyday objects...
July 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28716297/on-the-relative-merits-of-invasive-and-non-invasive-pre-surgical-brain-mapping-new-tools-in-ablative-epilepsy-surgery
#7
Andrew C Papanicolaou, Roozbeh Rezaie, Shalini Narayana, Asim F Choudhri, Abbas-Babajani-Feremi, Frederick A Boop, James W Wheless
Cortical Stimulation Mapping (CSM) and the Wada procedure have long been considered the gold standard for localizing motor and language-related cortical areas and for determining the language and memory-dominant hemisphere, respectively. In recent years, however, non-invasive methods such as magnetoencephalography (MEG), functional magnetic resonance imaging (fMRI), and transcranial magnetic stimulation (TMS) have emerged as promising alternatives to the aforementioned procedures, particularly in cases where the invasive localization of eloquent cortex has proven to be challenging...
July 3, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28714589/meg-biomarker-of-alzheimer-s-disease-absence-of-a-prefrontal-generator-during-auditory-sensory-gating
#8
Sanja Josef Golubic, Cheryl J Aine, Julia M Stephen, John C Adair, Janice E Knoefel, Selma Supek
Magnetoencephalography (MEG), a direct measure of neuronal activity, is an underexplored tool in the search for biomarkers of Alzheimer's disease (AD). In this study, we used MEG source estimates of auditory gating generators, nonlinear correlations with neuropsychological results, and multivariate analyses to examine the sensitivity and specificity of gating topology modulation to detect AD. Our results demonstrated the use of MEG localization of a medial prefrontal (mPFC) gating generator as a discrete (binary) detector of AD at the individual level and resulted in recategorizing the participant categories in (1) controls with mPFC generator localized in response to both the standard and deviant tones; (2) a possible preclinical stage of AD participants (a lower functioning group of controls) in which mPFC activation was localized to the deviant tone only; and (3) symptomatic AD in which mPFC activation was not localized to either the deviant or standard tones...
July 17, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28714584/oscillations-during-observations-dynamic-oscillatory-networks-serving-visuospatial-attention
#9
Alex I Wiesman, Elizabeth Heinrichs-Graham, Amy L Proskovec, Timothy J McDermott, Tony W Wilson
The dynamic allocation of neural resources to discrete features within a visual scene enables us to react quickly and accurately to salient environmental circumstances. A network of bilateral cortical regions is known to subserve such visuospatial attention functions; however the oscillatory and functional connectivity dynamics of information coding within this network are not fully understood. Particularly, the coding of information within prototypical attention-network hubs and the subsecond functional connections formed between these hubs have not been adequately characterized...
July 17, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28713260/automated-detection-of-epileptic-biomarkers-in-resting-state-interictal-meg-data
#10
Miguel C Soriano, Guiomar Niso, Jillian Clements, Silvia Ortín, Sira Carrasco, María Gudín, Claudio R Mirasso, Ernesto Pereda
Certain differences between brain networks of healthy and epilectic subjects have been reported even during the interictal activity, in which no epileptic seizures occur. Here, magnetoencephalography (MEG) data recorded in the resting state is used to discriminate between healthy subjects and patients with either idiopathic generalized epilepsy or frontal focal epilepsy. Signal features extracted from interictal periods without any epileptiform activity are used to train a machine learning algorithm to draw a diagnosis...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28712993/decoding-the-orientation-of-contrast-edges-from-meg-evoked-and-induced-responses
#11
REVIEW
Dimitrios Pantazis, Mingtong Fang, Sheng Qin, Yalda Mohsenzadeh, Quanzheng Li, Radoslaw Martin Cichy
Visual gamma oscillations have been proposed to subserve perceptual binding, but their strong modulation by diverse stimulus features confounds interpretations of their precise functional role. Overcoming this challenge necessitates a comprehensive account of the relationship between gamma responses and stimulus features. Here we used multivariate pattern analyses on human MEG data to characterize the relationships between gamma responses and one basic stimulus feature, the orientation of contrast edges. Our findings confirmed we could decode orientation information from induced responses in two dominant frequency bands at 24-32 Hz and 50-58 Hz...
July 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28712991/low-beta-cortico-pallidal-coherence-decreases-during-movement-and-correlates-with-overall-reaction-time
#12
Bernadette C M van Wijk, Wolf-Julian Neumann, Gerd-Helge Schneider, Tilmann H Sander, Vladimir Litvak, Andrea A Kühn
Beta band oscillations (13-30 Hz) are a hallmark of cortical and subcortical structures that are part of the motor system. In addition to local population activity, oscillations also provide a means for synchronization of activity between regions. Here we examined the role of beta band coherence between the internal globus pallidus (GPi) and (motor) cortex during a simple reaction time task performed by nine patients with idiopathic dystonia. We recorded local field potentials from deep brain stimulation (DBS) electrodes implanted in bilateral GPi in combination with simultaneous whole-head magneto-encephalography (MEG)...
July 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28711738/phase-properties-of-transcranial-electrical-stimulation-artifacts-in-electrophysiological-recordings
#13
Nima Noury, Markus Siegel
Monitoring brain activity during transcranial electric stimulation (tES) is an attractive approach for causally studying healthy and diseased brain activity. Yet, stimulation artifacts complicate electrophysiological recordings during tES. Design and evaluation of artifact removal methods require a through characterization of artifact features, i.e. characterization of the transfer function that defines the relationship between the tES stimulation current and tES artifacts. Here we characterize the phase relationship between stimulation current and tES artifacts in EEG and MEG...
July 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28709878/differential-tbxa2-receptor-transcript-stability-is-dependent-on-the-c924t-polymorphism
#14
Vincenzo De Iuliis, Sebastiano Ursi, Alfonso Pennelli, Marika Caruso, Angela Nunziata, Antonio Marino, Vincenzo Flati, Francesco Cipollone, Maria Adele Giamberardino, Gianfranco Vitullo, Elena Toniato, Pio Conti, Stefano Martinotti
BACKGROUND: In order to better characterize the molecular mechanisms involved in processing mutated transcripts, we investigated the post-transcriptional role of the C924T polymorphism (rs4523) located in the 3' region of the TBXA2R gene. METHODS: and RESULTS: Experiments of dose response with Actinomycin D on MEG-01 human cell line showed a significant decrease on cell viability that was more evident on cells treated for 24h. In addition, we showed that treatments with 5-10μM, 15μM and 20μM of actinomycin D reduced cell viability by 44%, 72% and 75%, respectively, compared to the control group...
July 11, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28702346/automatic-detection-and-visualisation-of-meg-ripple-oscillations-in-epilepsy
#15
Nicole van Klink, Frank van Rosmalen, Jukka Nenonen, Sergey Burnos, Liisa Helle, Samu Taulu, Paul Lawrence Furlong, Maeike Zijlmans, Arjan Hillebrand
High frequency oscillations (HFOs, 80-500 Hz) in invasive EEG are a biomarker for the epileptic focus. Ripples (80-250 Hz) have also been identified in non-invasive MEG, yet detection is impeded by noise, their low occurrence rates, and the workload of visual analysis. We propose a method that identifies ripples in MEG through noise reduction, beamforming and automatic detection with minimal user effort. We analysed 15 min of presurgical resting-state interictal MEG data of 25 patients with epilepsy. The MEG signal-to-noise was improved by using a cross-validation signal space separation method, and by calculating ~ 2400 beamformer-based virtual sensors in the grey matter...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28702344/directional-information-flow-in-patients-with-alzheimer-s-disease-a-source-space-resting-state-meg-study
#16
M M A Engels, M Yu, C J Stam, A A Gouw, W M van der Flier, Ph Scheltens, E C W van Straaten, A Hillebrand
In a recent magnetoencephalography (MEG) study, we found posterior-to-anterior information flow over the cortex in higher frequency bands in healthy subjects, with a reversed pattern in the theta band. A disruption of information flow may underlie clinical symptoms in Alzheimer's disease (AD). In AD, highly connected regions (hubs) in posterior areas are mostly disrupted. We therefore hypothesized that in AD the information flow from these hub regions would be disturbed. We used resting-state MEG recordings from 27 early-onset AD patients and 26 healthy controls...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28701945/magnetoencephalography-in-preoperative-epileptic-foci-localization-enlightenment-from-cognitive-studies
#17
REVIEW
Qian Wang, Pengfei Teng, Guoming Luan
Over 30% epileptic patients are refractory to medication, who are amenable to neurosurgical treatment. Non-invasive brain imaging technologies including video-electroencephalogram (EEG), magnetic resonance imaging (MRI), and magnetoencephalography (MEG) are widely used in presurgical assessment of epileptic patients. This review mainly discussed the current development of clinical MEG imaging as a diagnose approach, and its correlations with the golden standard intracranial electroencephalogram (iEEG). More importantly, this review discussed the possible applications of functional networks in preoperative epileptic foci localization in future studies...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28697725/the-role-of-family-and-school-level-factors-in-bullying-and-cyberbullying-a-cross-sectional-study
#18
Leonardo Bevilacqua, Nichola Shackleton, Daniel Hale, Elizabeth Allen, Lyndal Bond, Deborah Christie, Diana Elbourne, Natasha Fitzgerald-Yau, Adam Fletcher, Rebecca Jones, Alec Miners, Stephen Scott, Meg Wiggins, Chris Bonell, Russell M Viner
BACKGROUND: Bullying and cyberbullying are common phenomena in schools. These negative behaviours can have a significant impact on the health and particularly mental health of those involved in such behaviours, both as victims and as bullies. This UK study aims to investigate student-level and school-level characteristics of those who become involved in bullying and cyberbullying behaviours as victims or perpetrators. METHODS: We used data from 6667 Year 7 students from the baseline survey of a cluster randomized trial in 40 English schools to investigate the associations between individual-level and school-level variables with bullying victimization, cyberbullying perpetration, and cyberbullying victimization...
July 11, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28694855/the-effects-of-sweet-bitter-salty-and-sour-stimuli-on-alpha-rhythm-a-meg-study
#19
Athanasia Kotini, Photios Anninos, Triandafillos Gemousakakis, Adam Adamopoulos
OBJECTIVE: the possible diff erences in processing gustatory stimuli in healthy subjects was investigated by magnetoencephalography (meg). MATHERIAL AND METHOD: meg recordings were evaluated for 10 healthy volunteers (3 men within the age range 20-46 years, 7 women within the age range 10-28 years), with four diff erent gustatory stimuli: sweet, bi" er, sour and salty. Fast fourier transform was performed on meg epochs recorded for the above conditions and the eff ect of each kind of stimuli on alpha rhythm was examined...
September 2016: Mædica
https://www.readbyqxmd.com/read/28691435/clinical-and-public-health-implications-of-acute-and-early-hiv-detection-and-treatment-a-scoping-review
#20
Sarah E Rutstein, Jintanat Ananworanich, Sarah Fidler, Cheryl Johnson, Eduard J Sanders, Omar Sued, Asier Saez-Cirion, Christopher D Pilcher, Christophe Fraser, Myron S Cohen, Marco Vitoria, Meg Doherty, Joseph D Tucker
INTRODUCTION: The unchanged global HIV incidence may be related to ignoring acute HIV infection (AHI). This scoping review examines diagnostic, clinical, and public health implications of identifying and treating persons with AHI. METHODS: We searched PubMed, in addition to hand-review of key journals identifying research pertaining to AHI detection and treatment. We focused on the relative contribution of AHI to transmission and the diagnostic, clinical, and public health implications...
June 28, 2017: Journal of the International AIDS Society
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