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https://www.readbyqxmd.com/read/28337126/competition-between-persistent-na-and-muscarine-sensitive-k-currents-shapes-perithreshold-resonance-and-spike-tuning-in-ca1-pyramidal-neurons
#1
Jorge Vera, Julio Alcayaga, Magdalena Sanhueza
Neurons from many brain regions display intrinsic subthreshold theta-resonance, responding preferentially to theta-frequency oscillatory stimuli. Resonance may contribute to selective communication among neurons and to orchestrate brain rhythms. CA1 pyramidal neurons receive theta activity, generating place fields. In these neurons the expression of perithreshold frequency preference is controversial, particularly in the spiking regime, with evidence favoring either non-resonant (integrator-like) or resonant behavior...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28330464/spectral-temporal-eeg-dynamics-of-speech-discrimination-processing-in-infants-during-sleep
#2
Phillip M Gilley, Kristin Uhler, Kaylee Watson, Christine Yoshinaga-Itano
BACKGROUND: Oddball paradigms are frequently used to study auditory discrimination by comparing event-related potential (ERP) responses from a standard, high probability sound and to a deviant, low probability sound. Previous research has established that such paradigms, such as the mismatch response or mismatch negativity, are useful for examining auditory processes in young children and infants across various sleep and attention states. The extent to which oddball ERP responses may reflect subtle discrimination effects, such as speech discrimination, is largely unknown, especially in infants that have not yet acquired speech and language...
March 22, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28322886/high-gamma-oscillations-in-the-motor-cortex-during-visuo-motor-coordination-a-tacs-interferential-study
#3
E Santarnecchi, A Biasella, E Tatti, A Rossi, D Prattichizzo, S Rossi
BACKGROUND: While the role of beta (∼20Hz), theta (∼5Hz) and alpha (∼10Hz) oscillations in the motor areas have been repeatedly associated with defined properties of motor performance, the investigation of gamma (∼40-90Hz) oscillatory activity is a more recent and still not fully understood component of motor control physiology, despite its potential clinical relevance for motor disorders. OBJECTIVE/HYPOTHESIS: We have implemented an online neuromodulation paradigm based on transcranial alternating current stimulation (tACS) of the dominant motor cortex during a visuo-motor coordination task...
March 18, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28321433/transcription-factor-oscillations-in-neural-stem-cells-implications-for-accurate-control-of-gene-expression
#4
REVIEW
Pascal Bielefeld, Marijn Schouten, Paul J Lucassen, Carlos P Fitzsimons
Naturally occurring oscillations in glucocorticoids induce a cyclic activation of the glucocorticoid receptor (GR), a well-characterized ligand-activated transcription factor. These cycles of GR activation/deactivation result in rapid GR exchange at genomic response elements and GR recycling through the chaperone machinery, ultimately generating pulses of GR-mediated transcriptional activity of target genes. In a recent article we have discussed the implications of circadian and high-frequency (ultradian) glucocorticoid oscillations for the dynamic control of gene expression in hippocampal neural stem/progenitor cells (NSPCs) (Fitzsimons et al...
2017: Neurogenesis (Austin, Tex.)
https://www.readbyqxmd.com/read/28316302/high-frequency-oscillatory-ventilation-hfov-as-primary-ventilator-strategy-in-the-management-of-severe-acute-respiratory-distress-syndrome-ards-with-pneumothorax-in-the-setting-of-trauma
#5
Kartik Prabhakaran, Daniel Hagler, Dominick Vitale, Alejandro Betancourt, Patrizio Petrone, Corrado P Marini
No abstract text is available yet for this article.
March 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28302869/motor-and-mechanical-bases-of-the-courtship-call-of-the-male-treehopper-umbonia-crassicornis
#6
Carol I Miles, Brianna E Allison, Michael J Losinger, Quang T Su, Ronald N Miles
This study is a physiological, anatomical, and biophysical analysis of how plant-borne vibrational signals are produced by the treehopper Umbonia crassicornis During courtship, males and females engage in a vibrational duet, with each producing a characteristic call. For males, this consists of a frequency-modulated tonal signal which is accompanied by rhythmic broad-band clicks. While previous studies described these complex signals in detail, little is known about how they are produced. By combining video recordings, electromyograms, dissections and mechanical modelling, we describe the mechanism by which the male produces his courtship signal...
March 16, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28292973/evaluation-of-functional-characteristics-of-4-oscillatory-positive-pressure-devices-in-a-simulated-cystic-fibrosis-model
#7
Hillary Van Fleet, Diane K Dunn, Neil L McNinch, Teresa A Volsko
BACKGROUND: Oscillatory positive expiratory pressure (OPEP) is an airway clearance therapy that delivers positive pressure and air-flow oscillations during exhalation. This study described functional characteristic differences of 4 OPEP devices during an active exhalation in a simulated model. We hypothesized peak pressure (Ppeak), positive expiratory pressure (PEP), oscillatory frequency (f), and pressure amplitude will differ, depending upon the device used, device resistance setting, and time (repeated consecutive active exhalations through the device)...
March 14, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28288909/oscillatory-eeg-dynamics-underlying-automatic-chunking-during-sentence-processing
#8
Corinna E Bonhage, Lars Meyer, Thomas Gruber, Angela D Friederici, Jutta L Mueller
Sentences are easier to remember than random word sequences, likely because linguistic regularities facilitate chunking of words into meaningful groups. The present electroencephalography study investigated the neural oscillations modulated by this so-called sentence superiority effect during the encoding and maintenance of sentence fragments versus word lists. We hypothesized a chunking-related modulation of neural processing during the encoding and retention of sentence fragments as compared to word lists...
March 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28273699/-use-of-noninvasive-high-frequency-oscillatory-ventilation-in-very-low-birth-weight-infants
#9
C H Wang, L P Shi, X L Ma, H J Lin, Y P Xu, L Z Du
Objective: To evaluate the effectiveness and safety of the use of noninvasive high-frequency oscillation ventilation (nHFOV) in very low birth weight infants. Method: A total of 36 cases received nHFOV between January 2016 and October 2016 in Children's Hospital, Zhejiang University School of Medicine, including 24 males and 12 females, with the gestational age of (27.5±2.5) weeks and birth weight of(980±318)g. The data of the ventilator settings, side effects, and changes of the respiratory function before and after nHFOV were collected and analyzed retrospectively...
March 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28269450/oscillatory-brain-activity-changes-by-anodal-tdcs-an-ecog-study-on-anesthetized-beagles
#10
Sehyeon Jang, Donghyeon Kim, Junkil Been, Hohyun Cho, Sung Chan Jun
Measuring neuronal activity of transcranial direct current stimulation (tDCS) is essential for investigating tDCS in stimuli or after stimuli effects. The aim of this study was to investigate the oscillatory changes from anodal tDCS using electrocorticography (ECoG) on beagles. We applied 2 mA anodal tDCS and monitored the ECoG signals (32 channels, 512 Hz sampling rate) for 15 minutes in three anesthetized beagles. Then, we compared the power changes before, during, and after tDCS in six different bands (delta, theta, alpha, beta, low-gamma, and mid-gamma bands)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269119/analysis-of-embolic-signals-with-directional-dual-tree-rational-dilation-wavelet-transform
#11
Gorkem Serbes, Nizamettin Aydin
The dyadic discrete wavelet transform (dyadic-DWT), which is based on fixed integer sampling factor, has been used before for processing piecewise smooth biomedical signals. However, the dyadic-DWT has poor frequency resolution due to the low-oscillatory nature of its wavelet bases and therefore, it is less effective in processing embolic signals (ESs). To process ESs more effectively, a wavelet transform having better frequency resolution than the dyadic-DWT is needed. Therefore, in this study two ESs, containing micro-emboli and artifact waveforms, are analyzed with the Directional Dual Tree Rational-Dilation Wavelet Transform (DDT-RADWT)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268783/portable-forced-oscillation-device-for-point-of-care-pulmonary-function-testing
#12
Jian Cao, Ashutosh Sabharwal
The forced oscillation technique (FOT) provides a simple and accurate approach for pulmonary function testing. However, most current devices are large and high cost, hence the test remains sparingly used. To address this problem, we verified the feasibility of a smart and portable forced oscillation device based on a small subwoofer and ultrasonic sensor that is targeted at point-of-care pulmonary function testing. In this paper, we first develop and optimize the signal processing algorithm for impedance estimation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28261078/preattentive-processing-of-numerical-visual-information
#13
Philipp N Hesse, Constanze Schmitt, Steffen Klingenhoefer, Frank Bremmer
Humans can perceive and estimate approximate numerical information, even when accurate counting is impossible e.g., due to short presentation time. If the number of objects to be estimated is small, typically around 1-4 items, observers are able to give very fast and precise judgments with high confidence-an effect that is called subitizing. Due to its speed and effortless nature subitizing has usually been assumed to be preattentive, putting it into the same category as other low level visual features like color or orientation...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28256510/local-entrainment-of-oscillatory-activity-induced-by-direct-brain-stimulation-in-humans
#14
Julià L Amengual, Marine Vernet, Claude Adam, Antoni Valero-Cabré
In a quest for direct evidence of oscillation entrainment, we analyzed intracerebral electroencephalographic recordings obtained during intracranial electrical stimulation in a cohort of three medication-resistant epilepsy patients tested pre-surgically. Spectral analyses of non-epileptogenic cerebral sites stimulated directly with high frequency electrical bursts yielded episodic local enhancements of frequency-specific rhythmic activity, phase-locked to each individual pulse. These outcomes reveal an entrainment of physiological oscillatory activity within a frequency band dictated by the rhythm of the stimulation source...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28256232/viscoelastic-properties-of-confluent-mdck-ii-cells-obtained-from-force-cycle-experiments
#15
Bastian Rouven Brückner, Helen Nöding, Andreas Janshoff
The local mechanical properties of cells are frequently probed by force indentation experiments carried out with an atomic force microscope. Application of common contact models provides a single parameter, the Young's modulus, to describe the elastic properties of cells. The viscoelastic response of cells, however, is generally measured in separate microrheological experiments that provide complex shear moduli as a function of time or frequency. Here, we present a straightforward way to obtain rheological properties of cells from regular force distance curves collected in typical force indentation measurements...
February 28, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28250151/oscillatory-synchrony-between-head-direction-cells-recorded-bilaterally-in-the-anterodorsal-thalamic-nuclei
#16
William N Butler, Jeffrey Steven Taube
The head direction (HD) circuit is a complex, interconnected network of brain regions ranging from the brainstem to the cortex. Recent work found that HD cells co-recorded ipsilaterally in the anterodorsal nucleus (ADN) of the thalamus displayed coordinated firing patterns. A high frequency oscillation pattern (130-160 Hz) was visible in the cross-correlograms of these HD cell pairs. Spectral analysis further found that the power of this oscillation was greatest at 0 ms and decreased at greater lags, and demonstrated that there was greater synchrony between HD cells with similar tunings...
March 1, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28245137/severity-of-hypoxemia-and-effect-of-high-frequency-oscillatory-ventilation-in-ards
#17
Maureen O Meade, Duncan Young, Steven Hanna, Qi Zhou, Thomas E Bachman, Casper Bollen, Arthur S Slutsky, Sarah E Lamb, Neill Kj Adhikari, Spyros D Mentzelopoulos, Deborah J Cook, Sachin Sud, Roy G Brower, B Taylor Thompson, Sanjoy Shah, Alex Stenzler, Gordon Guyatt, Niall D Ferguson
RATIONALE: High frequency oscillatory ventilation (HFOV) is theoretically beneficial for lung protection but the results of clinical trials are inconsistent, with study-level meta-analyses suggesting no significant effect on mortality. OBJECTIVES: The aim of this individual patient data meta-analysis was to identify ARDS patient subgroups with differential outcomes from HFOV. METHODS: After a comprehensive search for trials, two reviewers independently identified randomized trials comparing HFOV with conventional ventilation for adults with ARDS...
February 28, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28227696/oscillatory-brain-activity-changes-by-anodal-tdcs-an-ecog-study-on-anesthetized-beagles
#18
Sehyeon Jang, Donghyeon Kim, Junkil Been, Hohyun Cho, Sung Chan Jun, Sehyeon Jang, Donghyeon Kim, Junkil Been, Hohyun Cho, Sung Chan Jun, Donghyeon Kim, Junkil Been, Sung Chan Jun, Hohyun Cho, Sehyeon Jang
Measuring neuronal activity of transcranial direct current stimulation (tDCS) is essential for investigating tDCS in stimuli or after stimuli effects. The aim of this study was to investigate the oscillatory changes from anodal tDCS using electrocorticography (ECoG) on beagles. We applied 2 mA anodal tDCS and monitored the ECoG signals (32 channels, 512 Hz sampling rate) for 15 minutes in three anesthetized beagles. Then, we compared the power changes before, during, and after tDCS in six different bands (delta, theta, alpha, beta, low-gamma, and mid-gamma bands)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227348/analysis-of-embolic-signals-with-directional-dual-tree-rational-dilation-wavelet-transform
#19
Gorkem Serbes, Nizamettin Aydin, Gorkem Serbes, Nizamettin Aydin, Nizamettin Aydin, Gorkem Serbes
The dyadic discrete wavelet transform (dyadic-DWT), which is based on fixed integer sampling factor, has been used before for processing piecewise smooth biomedical signals. However, the dyadic-DWT has poor frequency resolution due to the low-oscillatory nature of its wavelet bases and therefore, it is less effective in processing embolic signals (ESs). To process ESs more effectively, a wavelet transform having better frequency resolution than the dyadic-DWT is needed. Therefore, in this study two ESs, containing micro-emboli and artifact waveforms, are analyzed with the Directional Dual Tree Rational-Dilation Wavelet Transform (DDT-RADWT)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226975/portable-forced-oscillation-device-for-point-of-care-pulmonary-function-testing
#20
Jian Cao, Ashutosh Sabharwal, Jian Cao, Ashutosh Sabharwal, Jian Cao, Ashutosh Sabharwal
The forced oscillation technique (FOT) provides a simple and accurate approach for pulmonary function testing. However, most current devices are large and high cost, hence the test remains sparingly used. To address this problem, we verified the feasibility of a smart and portable forced oscillation device based on a small subwoofer and ultrasonic sensor that is targeted at point-of-care pulmonary function testing. In this paper, we first develop and optimize the signal processing algorithm for impedance estimation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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