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https://www.readbyqxmd.com/read/28198413/pre-encoding-gamma-band-activity-during-auditory-working-memory
#1
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/28195522/source-localization-of-brain-states-associated-with-canonical-neuroimaging-postures
#2
Michael Lifshitz, Robert T Thibault, Raquel R Roth, Amir Raz
Cognitive neuroscientists rarely consider the influence that body position exerts on brain activity; yet, postural variation holds important implications for the acquisition and interpretation of neuroimaging data. Whereas participants in most behavioral and EEG experiments sit upright, many prominent brain imaging techniques (e.g., fMRI) require participants to lie supine. Here we demonstrate that physical comportment profoundly alters baseline brain activity as measured by magnetoencephalography (MEG)-an imaging modality that permits multipostural acquisition...
February 14, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28194558/structural-imaging-of-mild-traumatic-brain-injury-may-not-be-enough-overview-of-functional-and-metabolic-imaging-of-mild-traumatic-brain-injury
#3
REVIEW
Samuel S Shin, James W Bales, C Edward Dixon, Misun Hwang
A majority of patients with traumatic brain injury (TBI) present as mild injury with no findings on conventional clinical imaging methods. Due to this difficulty of imaging assessment on mild TBI patients, there has been much emphasis on the development of diffusion imaging modalities such as diffusion tensor imaging (DTI). However, basic science research in TBI shows that many of the functional and metabolic abnormalities in TBI may be present even in the absence of structural damage. Moreover, structural damage may be present at a microscopic and molecular level that is not detectable by structural imaging modality...
February 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28194133/current-and-emerging-potential-of-magnetoencephalography-in-the-detection-and-localization-of-high-frequency-oscillations-in-epilepsy
#4
REVIEW
Eleonora Tamilia, Joseph R Madsen, Patricia Ellen Grant, Phillip L Pearl, Christos Papadelis
Up to one-third of patients with epilepsy are medically intractable and need resective surgery. To be successful, epilepsy surgery requires a comprehensive preoperative evaluation to define the epileptogenic zone (EZ), the brain area that should be resected to achieve seizure freedom. Due to lack of tools and methods that measure the EZ directly, this area is defined indirectly based on concordant data from a multitude of presurgical non-invasive tests and intracranial recordings. However, the results of these tests are often insufficiently concordant or inconclusive...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28187730/adherence-to-treatment-guidelines-the-association-between-stroke-risk-stratified-comparing-chads2-and-cha2ds2-vasc-score-levels-and-warfarin-prescription-for-adult-patients-with-atrial-fibrillation
#5
Scott A Chapman, Catherine A St Hill, Meg M Little, Michael T Swanoski, Shellina R Scheiner, Kenric B Ware, M Nawal Lutfiyya
BACKGROUND: Ischemic stroke is a risk associated with atrial fibrillation (AF) and is estimated to occur five times more often in afflicted patients than in those without AF. Anti-thrombotic therapy is recommended for the prevention of ischemic stroke. Risk stratification tools, such as the CHADS2, and more recently the CHA2DS2-VASc, for predicting stroke in patients with AF have been developed to determine the level of stroke risk and assist clinicians in the selection of antithrombotic therapy...
February 11, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28185721/approaches-and-adjuncts-used-by-physiotherapists-when-suctioning-adult-patients-who-are-intubated-and-ventilated-in-intensive-care-units-in-australia-and-new-zealand-a-cross-sectional-survey
#6
Charissa S L Tan, Meg Harrold, Kylie Hill
BACKGROUND: Suctioning is an integral component of care for patients who are intubated and ventilated in an intensive care unit (ICU). There appears to be no published data of physiotherapy suctioning practices in Australia or New Zealand. OBJECTIVE: To describe suctioning practices and the factors which have shaped these practices, of experienced physiotherapists working with adults who are intubated and ventilated in an ICU across Australia and New Zealand. Areas of investigation focused on: (i) suctioning approach (i...
February 6, 2017: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/28179479/impaired-auditory-to-motor-entrainment-in-parkinson-s-disease
#7
Erik S Te Woerd, Robert Oostenveld, Floris Pieter De Lange, Peter Praamstra
Several electrophysiological studies suggest that PD patients have a reduced tendency to entrain to regular environmental patterns. Here we investigate whether this reduced entrainment concerns a generalized deficit or is confined to movement-related activity, leaving sensory entrainment intact. Magnetoencephalography (MEG) was recorded during a rhythmic auditory target detection task in 14 PD patients and 14 control subjects. Participants were instructed to press a button when hearing a target tone amidst an isochronous sequence of standard tones...
February 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28177192/dna-targeted-inhibition-of-mgmt
#8
Nathan William Luedtke, Theodor Marsoner, Olivia Schmidt, Therese Trimer
The cationic porphyrin 5,10,15,20-tetrakis (diisopropyl-guanidine)-21H,23H-porphine "DIGPor" selectively binds to DNA containing O6-methylguanine (O6-MeG) and inhibits the DNA repair enzyme O6-methylguanine-DNA methyltransferase (MGMT). The O6-MeG selectivity and MGMT inhibitory activity of DIGPor was improved by incorporating ZnII into the porphyrin. The resulting metal complex "Zn-DIGPor" potentiated the activity of the DNA alkylating drug temozolomide in an MGMT-expressing cell line. To the best of our knowledge, these results provide the first examples of DNA-targeted MGMT inhibition...
February 8, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28174530/an-event-related-field-study-of-rapid-grammatical-plasticity-in-adult-second-language-learners
#9
Ainhoa Bastarrika, Douglas J Davidson
The present study used magnetoencephalography (MEG) to investigate how Spanish adult learners of Basque respond to morphosyntactic violations after a short period of training on a small fragment of Basque grammar. Participants (n = 17) were exposed to violation and control phrases in three phases (pretest, training, generalization-test). In each phase participants listened to short Basque phrases and they judged whether they were correct or incorrect. During the pre-test and generalization-test, participants did not receive any feedback...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28170403/longitudinal-assessment-of-sputum-microbiome-by-sequencing-of-the-16s-rrna-gene-in-non-cystic-fibrosis-bronchiectasis-patients
#10
Michael J Cox, Elena M Turek, Catherine Hennessy, Ghazala K Mirza, Phillip L James, Meg Coleman, Andrew Jones, Robert Wilson, Diana Bilton, William O C Cookson, Miriam F Moffatt, Michael R Loebinger
BACKGROUND: Bronchiectasis is accompanied by chronic bronchial infection that may drive disease progression. However, the evidence base for antibiotic therapy is limited. DNA based methods offer better identification and quantification of microbial constituents of sputum than standard clinical culture and may help inform patient management strategies. Our study objective was to determine the longitudinal variability of the non-cystic fibrosis (CF) bronchiectasis microbiome in sputum with respect to clinical variables...
2017: PloS One
https://www.readbyqxmd.com/read/28169431/conditioned-inhibitory-and-excitatory-gain-modulations-of-visual-cortex-in-fear-conditioning-effects-of-analysis-strategies-of-magnetocortical-responses
#11
Stephan Moratti, Tamara Giménez-Fernández, Constantino Méndez-Bértolo, Francisco de Vicente-Pérez
In unpredictable environments, stimuli that predict potential danger or its absence can change rapidly. Therefore, it is highly adaptive to prioritize incoming sensory information flexibly as a function of prior experience. Previously, these changes have only been conceptualized as excitatory gain increases in sensory cortices for acquired fear-relevant stimuli during associative learning. However, formal descriptions of associative processes by Rescorla and Wagner predict both conditioned excitatory and inhibitory processes in response systems for fear and safety cues, respectively...
February 7, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28169281/gating-of-memory-encoding-of-time-delayed-cross-frequency-meg-networks-revealed-by-graph-filtration-based-on-persistent-homology
#12
Jarang Hahm, Hyekyoung Lee, Hyojin Park, Eunjoo Kang, Yu Kyeong Kim, Chun Kee Chung, Hyejin Kang, Dong Soo Lee
To explain gating of memory encoding, magnetoencephalography (MEG) was analyzed over multi-regional network of negative correlations between alpha band power during cue (cue-alpha) and gamma band power during item presentation (item-gamma) in Remember (R) and No-remember (NR) condition. Persistent homology with graph filtration on alpha-gamma correlation disclosed topological invariants to explain memory gating. Instruction compliance (R-hits minus NR-hits) was significantly related to negative coupling between the left superior occipital (cue-alpha) and the left dorsolateral superior frontal gyri (item-gamma) on permutation test, where the coupling was stronger in R than NR...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167897/meg-signatures-of-a-perceived-match-or-mismatch-between-individual-and-group-opinions
#13
Ivan Zubarev, Vasily Klucharev, Alexei Ossadtchi, Victoria Moiseeva, Anna Shestakova
Humans often adjust their opinions to the perceived opinions of others. Neural responses to a perceived match or mismatch between individual and group opinions have been investigated previously, but some findings are inconsistent. In this study, we used magnetoencephalographic source imaging to investigate further neural responses to the perceived opinions of others. We found that group opinions mismatching with individual opinions evoked responses in the anterior and posterior medial prefrontal cortices, as well as in the temporoparietal junction and ventromedial prefrontal cortex in the 220-320 and 380-530 ms time windows...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28161401/enhancing-public-health-hiv-interventions-a-qualitative-meta-synthesis-and-systematic-review-of-studies-to-improve-linkage-to-care-adherence-and-retention
#14
Joseph D Tucker, Lai Sze Tso, Brian Hall, Qingyan Ma, Rachel Beanland, John Best, Haochu Li, Mellanye Lackey, Gifty Marley, Zachary C Rich, Ka-Lon Sou, Meg Doherty
Although HIV services are expanding, few have reached the scale necessary to support universal viral suppression of individuals living with HIV. The purpose of this systematic review was to summarize the qualitative evidence evaluating public health HIV interventions to enhance linkage to care, antiretroviral drug (ARV) adherence, and retention in care. We searched 19 databases without language restrictions. The review collated data from three separate qualitative evidence reviews addressing each of the three outcomes along the care continuum...
January 31, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28161286/meg-and-eeg-demonstrate-similar-test-retest-reliability-of-the-40hz-auditory-steady-state-response
#15
Kristina T Legget, Allison K Hild, Sarah E Steinmetz, Steven T Simon, Donald C Rojas
The auditory steady-state response (ASSR) is increasingly being used as a biomarker in neuropsychiatric disorders, but research investigating the test-retest reliability of this measure is needed. We previously reported ASSR reliability, measured by electroencephalography (EEG), to 40Hz amplitude-modulated white noise and click train stimuli. The purpose of the current study was to (a) assess the reliability of the MEG-measured ASSR to 40Hz amplitude-modulated white noise and click train stimuli, and (b) compare test-retest reliability between MEG and EEG measures of ASSR, which has not previously been investigated...
February 1, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28158201/children-show-right-lateralized-effects-of-spoken-word-form-learning
#16
Anni Nora, Leena Karvonen, Hanna Renvall, Tiina Parviainen, Jeong-Young Kim, Elisabet Service, Riitta Salmelin
It is commonly thought that phonological learning is different in young children compared to adults, possibly due to the speech processing system not yet having reached full native-language specialization. However, the neurocognitive mechanisms of phonological learning in children are poorly understood. We employed magnetoencephalography (MEG) to track cortical correlates of incidental learning of meaningless word forms over two days as 6-8-year-olds overtly repeated them. Native (Finnish) pseudowords were compared with words of foreign sound structure (Korean) to investigate whether the cortical learning effects would be more dependent on previous proficiency in the language rather than maturational factors...
2017: PloS One
https://www.readbyqxmd.com/read/28155864/aberrant-neuronal-dynamics-during-working-memory-operations-in-the-aging-hiv-infected-brain
#17
Tony W Wilson, Amy L Proskovec, Elizabeth Heinrichs-Graham, Jennifer O'Neill, Kevin R Robertson, Howard S Fox, Susan Swindells
Impairments in working memory are among the most prevalent features of HIV-associated neurocognitive disorders (HAND), yet their origins are unknown, with some studies arguing that encoding operations are disturbed and others supporting deficits in memory maintenance. The current investigation directly addresses this issue by using a dynamic mapping approach to identify when and where processing in working memory circuits degrades. HIV-infected older adults and a demographically-matched group of uninfected controls performed a verbal working memory task during magnetoencephalography (MEG)...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28153933/reducing-falls-after-hospital-discharge-a-protocol-for-a-randomised-controlled-trial-evaluating-an-individualised-multimodal-falls-education-programme-for-older-adults
#18
Anne-Marie Hill, Christopher Etherton-Beer, Steven M McPhail, Meg E Morris, Leon Flicker, Ronald Shorr, Max Bulsara, Den-Ching Lee, Jacqueline Francis-Coad, Nicholas Waldron, Amanda Boudville, Terry Haines
INTRODUCTION: Older adults frequently fall after discharge from hospital. Older people may have low self-perceived risk of falls and poor knowledge about falls prevention. The primary aim of the study is to evaluate the effect of providing tailored falls prevention education in addition to usual care on falls rates in older people after discharge from hospital compared to providing a social intervention in addition to usual care. METHODS AND ANALYSES: The 'Back to My Best' study is a multisite, single blind, parallel-group randomised controlled trial with blinded outcome assessment and intention-to-treat analysis, adhering to CONSORT guidelines...
February 2, 2017: BMJ Open
https://www.readbyqxmd.com/read/28151846/osteomyelitis-of-the-odontoid-process-in-children-two-cases-and-review-of-the-literature
#19
Asael Lubotzky, Ruth Cytter Kuint, Eliyahu Raccah, Orli Megged
OBJECTIVE: To report clinical, laboratory, and radiologic manifestations in two infants with osteomyelitis of the odontoid process (dens). BACKGROUND: Vertebral osteomyelitis is uncommon, and osteomyelitis of the dens has rarely been reported in the pediatric population. METHODS: The medical records of two infants diagnosed with dens osteomyelitis were reviewed. RESULTS: Both infants had fever which resolved spontaneously before admission...
January 31, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28151412/a-trial-of-extending-hemodialysis-hours-and-quality-of-life
#20
Meg J Jardine, Li Zuo, Nicholas A Gray, Janak R de Zoysa, Christopher T Chan, Martin P Gallagher, Helen Monaghan, Stuart M Grieve, Rajesh Puranik, Hongli Lin, Josette M Eris, Ling Zhang, Jinsheng Xu, Kirsten Howard, Serigne Lo, Alan Cass, Vlado Perkovic
The relationship between increased hemodialysis hours and patient outcomes remains unclear. We randomized (1:1) 200 adult recipients of standard maintenance hemodialysis from in-center and home-based hemodialysis programs to extended weekly (≥24 hours) or standard (target 12-15 hours, maximum 18 hours) hemodialysis hours for 12 months. The primary outcome was change in quality of life from baseline assessed by the EuroQol 5 dimension instrument (3 level) (EQ-5D). Secondary outcomes included medication usage, clinical laboratory values, vascular access events, and change in left ventricular mass index...
February 1, 2017: Journal of the American Society of Nephrology: JASN
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