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https://www.readbyqxmd.com/read/29084278/the-cortical-responses-to-evoked-clinical-pain-in-patients-with-hip-osteoarthritis
#1
Mikkel Gram, Joachim Erlenwein, Frank Petzke, Deborah Falla, Michael Przemeck, Miriam I Emons, Michael Reuster, Søren S Olesen, Asbjørn M Drewes
BACKGROUND: Experimental models have been used extensively to evaluate pain using e.g., visual analogue scales or electroencephalography (EEG). Stimulation using tonic pain has been shown to better mimic the unpleasantness of chronic pain, but has mainly been evoked by non-clinical stimuli. This study aims to, evaluate the EEG during clinical pain in patients scheduled for total hip replacement with control and resting conditions. METHODS: The hip scheduled for replacement was moved by the examiner to evoke pain for 30 seconds while recording EEG...
2017: PloS One
https://www.readbyqxmd.com/read/29060032/change-in-functional-networks-for-transitions-between-states-of-consciousness-during-midazolam-induced-sedation
#2
Minji Lee, Robert D Sanders, Seul-Ki Yeom, Dong-Ok Won, Hwi-Jae Kim, Bo-Ram Lee, Kwang-Suk Seo, Hyun Jeong Kim, Giulio Tononi, Seong-Whan Lee
How brain dynamics change across conscious states, including reliable signatures of the transitions between unconsciousness and consciousness, remains unclear. In this work, we addressed the changes in functional brain networks during self-titrated midazolam sedation using high-density electroencephalography (EEG) in ten subjects. We were particularly interested in the underlying network alterations, identified with graph theory, associated with transitions between states of consciousness. The weighted Phase Lag Index (wPLI) was used as the connectivity estimator between two signals...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29050860/eeg-power-spectrum-maturation-in-preterm-fetal-growth-restricted-infants
#3
Emily Cohen, Flora Y Wong, Euan M Wallace, Joanne C Mockler, Alexsandria Odoi, Samantha Hollis, Rosemary S C Horne, Stephanie R Yiallourou
Power spectral analysis of the electroencephalogram (EEG) is a non-invasive method to examine infant brain maturation. Preterm fetal growth restricted (p-FGR) neonates display an altered EEG power spectrum compared to appropriate-for-gestational-age (AGA) peers, suggesting delayed brain maturation. Longitudinal studies investigating EEG power spectrum maturation in p-FGR infants are lacking, however. We thus aimed to investigate brain maturation using sleep EEG power spectral analysis in p-FGR infants compared to preterm and term AGA controls (p-AGA and t-AGA, respectively)...
October 16, 2017: Brain Research
https://www.readbyqxmd.com/read/29049297/functional-connectivity-structure-of-cortical-calcium-dynamics-in-anesthetized-and-awake-mice
#4
Patrick W Wright, Lindsey M Brier, Adam Q Bauer, Grant A Baxter, Andrew W Kraft, Matthew D Reisman, Annie R Bice, Abraham Z Snyder, Jin-Moo Lee, Joseph P Culver
The interplay between hemodynamic-based markers of cortical activity (e.g. fMRI and optical intrinsic signal imaging), which are an indirect and relatively slow report of neural activity, and underlying synaptic electrical and metabolic activity through neurovascular coupling is a topic of ongoing research and debate. As application of resting state functional connectivity measures is extended further into topics such as brain development, aging and disease, the importance of understanding the fundamental physiological basis for functional connectivity will grow...
2017: PloS One
https://www.readbyqxmd.com/read/28982607/the-dichotomy-between-low-frequency-and-delta-waves-in-human-sleep-a-reappraisal
#5
Jean-Pol Lanquart, Pasquale Nardone, Philippe Hubain, Gwénolé Loas, Paul Linkowski
BACKGROUND: We present the results of an analysis of the low frequency (LF) (0.25-1Hz) and delta (1-4Hz) waves during human sleep. Our objective was to investigate whether LF and delta waves should be considered as separate entities. METHODS: The slow-wave electroencephalogram (EEG) activity of 2 sets of 10 young, healthy volunteers was analysed utilising the rarely-used Lomb-Scargle periodogram. This method has advantages over the more commonly-used Fast Fourier Transform analysis...
October 2, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28958482/the-individual-contribution-of-dsm-5-symptom-clusters-of-ptsd-life-events-and-childhood-adversity-to-frontal-oscillatory-brain-asymmetry-in-a-large-sample-of-active-combatants
#6
James K Moran, Anselm Crombach, Thomas Elbert, Corina Nandi, Manassé Bambonyé, Christian Wienbruch, Ursula Lommen, Roland Weierstall
Post-Traumatic Stress Disorder (PTSD) has been linked to deviations in lateralized frontal functional oscillatory activity. This is possibly because left and right DLPFC have differential roles in regulating both memory and stress response, which are both dysfunctional in PTSD. However, previous results are heterogeneous, and could be attributable to individual symptom clusters, traumatic or aggressive life events, early life stress, or the interaction of these factors. In a large sample of active combatants (N=401), we regressed these factors on frontal electroencephalography (EEG) asymmetry across 5 frequency bands (delta: 2-4Hz; theta: 4-8Hz; alpha: 8-12Hz; beta: 12-24Hz; gamma: 24-48Hz)...
September 25, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28842260/latent-binocular-function-in-amblyopia
#7
Eva Chadnova, Alexandre Reynaud, Simon Clavagnier, Robert F Hess
Recently, psychophysical studies have shown that humans with amblyopia do have binocular function that is not normally revealed due to dominant suppressive interactions under normal viewing conditions. Here we use magnetoencephalography (MEG) combined with dichoptic visual stimulation to investigate the underlying binocular function in humans with amblyopia for stimuli that, because of their temporal properties, would be expected to bypass suppressive effects and to reveal any underlying binocular function...
August 31, 2017: Vision Research
https://www.readbyqxmd.com/read/28818339/impact-of-machining-on-the-flexural-fatigue-strength-of-glass-and-polycrystalline-cad-cam-ceramics
#8
Sara Fraga, Marina Amaral, Marco Antônio Bottino, Luiz Felipe Valandro, Cornelis Johannes Kleverlaan, Liliana Gressler May
OBJECTIVES: To assess the effect of machining on the flexural fatigue strength and on the surface roughness of different computer-aided design, computer-aided manufacturing (CAD/CAM) ceramics by comparing machined and polished after machining specimens. METHODS: Disc-shaped specimens of yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP), leucite-, and lithium disilicate-based glass ceramics were prepared by CAD/CAM machining, and divided into two groups: machining (M) and machining followed by polishing (MP)...
November 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28798149/the-utility-of-accelerometers-to-predict-stroke-rate-in-captive-fur-seals-and-sea-lions
#9
Monique A Ladds, David A Rosen, David J Slip, Robert G Harcourt
The energy expenditure of free-living fur seals and sea lions is difficult to measure directly, but may be indirectly derived from flipper stroke rate. We filmed 10 captive otariids swimming with accelerometers either attached to a harness (Daily Diary: sampling frequency 32 Hz, N=4) or taped to the fur (G6a+: 25 Hz, N=6). We used down sampling to derive four recording rates from each accelerometer (Daily Diary: 32, 16, 8, 4 Hz; G6a+: 25, 20, 10, 5 Hz). For each of these sampling frequencies, we derived 20 combinations of two parameters (RMW, the window size used to calculate the running mean; and m, the minimum number of points smaller than a local maxima used to detect a peak) from the dynamic acceleration of x, z and x+z, to estimate stroke rate from the accelerometers...
September 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28771509/combined-effect-of-prefrontal-transcranial-direct-current-stimulation-and-a-working-memory-task-on-heart-rate-variability
#10
RANDOMIZED CONTROLLED TRIAL
Stevan Nikolin, Tjeerd W Boonstra, Colleen K Loo, Donel Martin
Prefrontal cortex activity has been associated with changes to heart rate variability (HRV) via mediation of the cortico-subcortical pathways that regulate the parasympathetic and sympathetic branches of the autonomic nervous system. Changes in HRV due to altered prefrontal cortex functioning can be predicted using the neurovisceral integration model, which suggests that prefrontal hyperactivity increases parasympathetic tone and decreases contributions from the sympathetic nervous system. Working memory (WM) tasks and transcranial direct current stimulation (tDCS) have been used independently to modulate brain activity demonstrating changes to HRV in agreement with the model...
2017: PloS One
https://www.readbyqxmd.com/read/28746840/quantitative-assessments-of-extracellular-eeg-to-classify-specific-features-of-main-phases-of-seizure-acquisition-based-on-kindling-model-in-rat
#11
Mostafa Jalilifar, Ali Yadollahpour, Ahmad Ali Moazedi, Zohreh Ghotbeddin
OBJECTIVE: Quantitative assessments of extracellular EEG to identify specific features of three main phases of seizure acquisition based on kindling model in Rat. METHODS: Male rats were divided into 2 groups including kindled (n=10) and sham (n=7) and respectively underwent an amygdala rapid kindling and placebo kindling. EEG signals in stages 1-2 (initial seizure stages (ISSs)), 3 (localized seizure stage (LSS)), and 4-5 generalized seizure stages (GSSs) were divided into 5 bands: delta (0-4Hz), theta (4-8Hz), alpha (8-12Hz), beta (12-28Hz), and gamma (28-40Hz)...
July 23, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28738275/early-childhood-myoclonic-epilepsy-an-independent-genetic-generalized-epilepsy-with-myoclonic-seizures-as-the-main-seizure-type
#12
Zhixian Yang, Jiao Xue, Hui Li, Ping Qian, Xiaoyan Liu, Yuwu Jiang, Yuehua Zhang
OBJECTIVE: To elucidate the characteristics of the myoclonic seizures alone, or predominant myoclonus combined with generalized tonic-clonic seizures (GTCS) and/or absences, in early childhood, and discuss its classification. METHODS: Forty-two children were retrospectively recruited between January 2006 and June 2015. RESULTS: The mean age of seizure onset was 40.5months. They were divided into 4 groups: myoclonic seizures alone; predominant myoclonus combined with GTCS; predominant myoclonus combined with absences; predominant myoclonus combined with both GTCS and absences...
September 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28732280/evaluation-of-a-novel-median-power-spectrogram-for-seizure-detection-by-non-neurophysiologists
#13
Peter Yan, Tamar Melman, Sherry Yan, Munkhzul Otgonsuren, Zachary Grinspan
PURPOSE: (1) To evaluate how well resident physicians use a novel EEG spectral analysis tool (the median power spectrogram; MPS) to detect seizures. (2) To assess the capability of the MPS to identify different seizure types. METHODS: 120 EEG records from children with intractable seizures were converted to MPS by taking the median power across leads and using multi-taper spectral estimation. Twelve blinded neurology residents were trained to interpret the spectrogram with a five-minute video tutorial and post-test...
June 15, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28628390/influence-of-screw-surface-treatment-on-retention-of-implant-supported-fixed-partial-dentures
#14
Marcos Boaventura de Moura, Renata Borges Rodrigues, Leandro Moreira Pinto, Cleudmar Amaral de Araújo, Veridiana Resende Novais, Paulo Cézar Simamoto Júnior
The aim of this study was to assess the effect of a diamond-like carbon (DLC) coating on the removal torque of prefabricated implant screws after cyclic loading. Four groups with two crowns supported by two implants (n = 5) were obtained according to splinted and nonsplinted prosthesis, using titanium or DLC screws (splinted crowns with titanium screw [STi], splinted crowns with DLC screw [SC], nonsplinted crowns and titanium screw [NSTi], and nonsplinted crowns and DLC screw [NSC]). The prosthetic screws were tightened at 32 Ncm and retightened, and the specimens were submitted to 106 mechanical cycles (4 Hz/98 N)...
August 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28577906/dynamic-head-neck-stabilization-and-modulation-with-perturbation-bandwidth-investigated-using-a-multisegment-neuromuscular-model
#15
Riender Happee, Edo de Bruijn, Patrick A Forbes, Frans C T van der Helm
The human head-neck system requires continuous stabilization in the presence of gravity and trunk motion. We investigated contributions of the vestibulocollic reflex (VCR), the cervicocollic reflex (CCR), and neck muscle co-contraction to head-in-space and head-on-trunk stabilization, and investigated modulation of the stabilization strategy with the frequency content of trunk perturbations and the presence of visual feedback. We developed a multisegment cervical spine model where reflex gains (VCR and CCR) and neck muscle co-contraction were estimated by fitting the model to the response of young healthy subjects, seated and exposed to anterior-posterior trunk motion, with frequency content from 0...
May 17, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28562524/the-work-rate-of-elite-hurling-match-play
#16
Kieran Collins, Allistair McRobert, James P Morton, Declan O' Sullivan, Dominic A Doran
The current study describes the global work-rate of elite hurling match-play and the influence which positional difference has on work-rate is considered. The movement of ninety-four players was recorded using GPS, sampling at 4Hz in a total of 12 games. Data were classified according to the positional line on the field and period of the match. The total and high speed distance of match-play was 7617 ± 1219 m (95% CI, 7367 - 7866) and 1134 ± 358 m (95% CI, 1060 - 1206) respectively. The maximum speed attained was 29...
January 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28527912/implicit-variations-of-temporal-predictability-shaping-the-neural-oscillatory-and-behavioural-response
#17
Sophie K Herbst, Jonas Obleser
Being able to predict when an event will occur (temporal predictability) can help us prepare and time our responses. We here sought to delineate the neural and behavioural corollaries of highly implicit, probabilistic temporal predictability in an auditory foreperiod paradigm. To this end, we measured electroencephalography (EEG) and response times in two independent experiments (total N =46). Unbeknownst to participants, we induced a probabilistic variation of cue-target delays (i.e., foreperiods) in a pitch-discrimination task on a noise-embedded tone: The smaller the standard deviation of the underlying foreperiod distribution, the more predictable the time of target occurrence should be...
May 17, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28460716/does-electrode-placement-influence-tens-induced-antihyperalgesia-in-experimental-inflammatory-pain-model
#18
Maurício L Poderoso Neto, Leonardo Y S Maciel, Kamilla M L Cruz, Valter J Santana Filho, Leonardo R Bonjardim, Josimari M DeSantana
BACKGROUND: Transcutaneous electrical nerve stimulation (TENS) is a treatment commonly used for managing pain; however, the ideal placement of the electrodes is not fully understood. OBJECTIVE: To investigate the best way to apply TENS electrodes in an experimental inflammatory pain model. METHOD: Knee joint inflammation was induced in rats, followed by administration of low-frequency TENS (4Hz) under anesthesia for five days. Animals were randomly allocated to five groups according to electrode placement (n=6, each): dermatome, contralateral, paraspinal, acupoint, and control...
March 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28412532/spectral-analysis-highlight-developmental-eeg-changes-in-preterm-infants-without-overt-brain-damage
#19
Agnese Suppiej, Elisa Cainelli, Ambra Cappellari, Daniele Trevisanuto, Laura Balao, Maria Grazia Di Bono, Patrizia S Bisiacchi
Early markers of neurological outcome in the absence of overt brain damage are scarce in extreme prematurity. The aim of this study was to compare spectral EEG values of infants born near term with those of infants born at extremely low gestational age (ELGA) but having attained near term age. We aimed also to evaluate whether spectral EEG features were related with neurological outcome. The ELGA group consisted of 12 neonates born between 23+2 and 27+6 weeks; the control group consisted of nine infants born 34-35+2 weeks, tested within the first week of life...
April 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28315757/chronic-social-stress-leads-to-altered-sleep-homeostasis-in-mice
#20
Nadja Olini, Iru Rothfuchs, Damiano Azzinnari, Christopher R Pryce, Salome Kurth, Reto Huber
Disturbed sleep and altered sleep homeostasis are core features of many psychiatric disorders such as depression. Chronic uncontrollable stress is considered an important factor in the development of depression, but little is known on how chronic stress affects sleep regulation and sleep homeostasis. We therefore examined the effects of chronic social stress (CSS) on sleep regulation in mice. Adult male C57BL/6 mice were implanted for electrocortical recordings (ECoG) and underwent either a 10-day CSS protocol or control handling (CON)...
June 1, 2017: Behavioural Brain Research
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