?
Intraoperative subdural low-noise EEG recording of the high frequency oscillation in the somatosensory evoked potential
Clinical Neurophysiology. 2017. Vol. 128. No. 10. P. 1851–1857.
Objective: The detectability of high frequency oscillations (HFO, >200Hz) in the intraoperative ECoG is restricted by their low signal-to-noise ratio (SNR). Using the somatosensory evoked HFO, we quantify how HFO detectability can benefit from a custom-made low-noise amplifier (LNA).
Methods: In 9 patients undergoing tumor surgery in the central region, subdural strip electrodes were placed for intraoperative neurophysiological monitoring. We recorded the somatosensory evoked potential (SEP) simultaneously by custom-made LNA and by a commercial device (CD). We varied the stimulation rate between 1.3 and 12.7Hz to tune the SNR of the N20 component and the evoked HFO and quantified HFO detectability at the single trial level. In three patients we compared Propofol® and Sevoflurane® anesthesia.
Results: In the average, amplitude decreased in both in N20 and evoked HFO amplitude with increasing stimulation rate (p<0.05). We detected a higher percentage of single trial evoked HFO with the LNA (p<0.001) for recordings with low impedance (<5kΩ). Average amplitudes were indistinguishable between anesthesia compounds.
Conclusion: Low-noise amplification improves the detection of the evoked HFO in recordings with subdural electrodes with low impedance.
Significance: Low-noise EEG might critically improve the detectability of interictal spontaneous HFO in subdural and possibly in scalp recordings.
Гущина В. А., / Series chemrxiv-2023-vpzhz-v2 "ChemRxiv". 2023.
All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are being intensively studied due to their unique properties and wide range of applications; however, however, the nature of their optical properties is not yet fully understood due to the difficulty of synthesis of singlephase nanoparticles. In this article we describe the features of the synthesis of single-phase particles ...
Added: May 14, 2026
Strizhkova D., / Институт русской литературы (Пушкинский Дом) РАН. Серия B001 "Репозиторий открытых данных по русской литературе и фольклору". 2026.
В базе данных представлена роспись русскоязычных литературных произведений и отрывков, напечатанных в учебниках по словесности, хрестоматиях, книгах для чтения, сборниках стихотворений и рассказов, выходивших во Франции, Германии, Латвии, Эстонии, Болгарии, Сербии в период первой волны русской эмиграции с 1918 по 1939 гг. Датасет представляет интерес для исследователей школьного литературного канона, эмиграции и детского чтения ...
Added: April 22, 2026
Pilé I., Deng Y., Shchur L., / Series arXiv "math". 2026. No. 2604.10254.
We investigate the spatial overlap of successive spin configurations in Markov chain Monte Carlo simulations using the local Metropolis algorithm and the Svendsen-Wang and Wolff cluster algorithms. We examine the dynamics of these algorithms for two models in different universality classes: the Ising model and the Potts model with three components. The overlap of two ...
Added: April 20, 2026
Жигунов А. Ю., / Basic Research Programme. Серия HUM "Humanities". 2026. № 1.
The article attempts to describe the features of the educational potential of Russian animation programmes in aspect of the representation of traditional spiritual and moral values. Based on media and semiotic analysis, the method of cultural and historical interpretation, animated Russian projects created from 2000 to the 2025, which were translated on television channels or streaming ...
Added: April 19, 2026
Chernyshov D., Satanin A., Shchur L., / Series arXiv "math". 2025.
We investigate the boundary separating regular and chaotic dynamics in the generalized Chirikov map, an extension of the standard map with phase-shifted secondary kicks. Lyapunov maps were computed across the parameter space (K,K(α, τ)) and used to train a convolutional neural network (ResNet18) for binary classification of dynamical regimes. The model reproduces the known critical ...
Added: November 21, 2025
Малахов В. С., Симон М. Е., Летняков Д. Э. et al., / SSRN. Серия Social Science Research Network "Social Science Research Network". 2020.
The notion of “political accommodation” applied to the theory and practice of managing cultural diversity could enrich the Russian academic dictionary. Liberal democratic states invented specific mechanisms for political accommodation of cultural differences. Thanks to these mechanisms, the part of the population of a democratic state that is not ready to dissolve into the ethnocultural ...
Added: September 26, 2025
Melville A. Y., Каберник В. В., Mironyuk M. et al., / МГИМО МИД России. 2024.
Данный аналитический доклад является одним из результатов исследований в рамках консорциума НИУ ВШЭ и МГИМО. В нем прежде всего раскрыты вопросы концептуализации национальной мощи и сопутствующих категорий и дается обзор прецедентов. Далее рассматриваются вопросы операционализации предлагаемых нами компонентов национальной мощи. В следующих разделах доклада предлагается анализ вопросов методологии, используемой в докладе. На этой основе предложен ...
Added: September 19, 2025
Antipkina I., Ivanov A., Guzhelya D., / Series WP BRP "Basic research program". 2024.
This study presents a methodology for developing a new questionnaire format called explicit continuum scenario scales, in the example of a client focus questionnaire. Elements of the Rasch Guttman scenario scale methodology were used in its development. In three consequent studies, different aspects of the scale functioning were investigated. In Study 1, on the sample ...
Added: February 21, 2025
Iurina E., Bailles E., Pintor L., Seizure : the journal of the British Epilepsy Association 2021 Vol. 85 P. 95–101
Abstract
Purpose: We aimed to conduct a systematic review to evaluate the personality changes in adult patients with drug-resistant epilepsy following surgical treatment.
Methods: A systematic review was conducted using the Preferred Reporting Items of Systematic Reviews and MetaAnalyses (PRISMA) statement. We searched PubMed, Medline databases, and the Cochrane Controlled Trials Register, with search terms 'personality', 'epilepsy', and 'surgery'.
Results: Eleven ...
Added: January 29, 2025
Aitzhanov S., / NRU HSE. Series WP BRP "Linguistics". 2024. No. 116.
This study focuses on examining the role of language as an attribute in the construction of ethnicity within the Korean community in Kazakhstan. The research examines how language functions as an attribute in the categorization and identification processes, and how it interacts with other ethnic attributes such as descent and appearance. Drawing on qualitative methods, ...
Added: December 10, 2024
Kagan M., Silkin V. M., Efremov D. V., / Series arXiv "math". 2024. No. 2411.12836.
In this study, we analyze the dielectric function of high-Tc cuprates as a function of doping level, taking into account the full energy band dispersion within the CuO2 monolayer. In addition to the conventional two-dimensional (2D) gapless plasmon mode, our findings reveal the existence of three anomalous branches within the plasmon spectrum. Two of these branches ...
Added: November 27, 2024
Микаелян А. Л., / NRU Higher School of Economics. Series WP BRP "Literary Studies". 2024. No. 28.
The article presents an attempt to examine Goethe's poem "Reineke Fox" in connection with the discussion between Goethe and Schiller about the nature of epic poetry and the principles of its renewal within the poetics of "Weimar Classicism". Goethe introduced into his interpretation of the medieval story of the Fox a number of innovations at various ...
Added: November 19, 2024
Gerstl J. ., Alina Kiseleva, Imbach L. et al., Scientific Reports 2023 No. 13 Article 21313
We evaluate whether interictal spikes, epileptiform HFOs and their co-occurrence (Spike + HFO) were
included in the resection area with respect to seizure outcome. We also characterise the relationship
between high frequency oscillations (HFOs) and propagating spikes. We analysed intracranial EEG of
20 patients that underwent resective epilepsy surgery. The co-occurrence of ripples and fast ripples
was considered an ...
Added: March 13, 2024
Karpychev V., Balatskaya A., Utyashev N. et al., Frontiers in Human Neuroscience 2022 No. 16 Article 984306
High-frequency oscillations (HFO) are a promising biomarker for the identification of epileptogenic tissue. While HFO rates have been shown to predict seizure outcome, it is not yet clear whether their morphological features might improve this prediction. We validated HFO rates against seizure outcome and delineated the distribution of HFO morphological features. We collected stereo-EEG recordings ...
Added: October 1, 2022
Fedele T., Ramantani G., Burnos S. et al., Clinical Neurophysiology 2017 Vol. 128 No. 7 P. 1220–1226
Objective
Fast ripples (FR, 250–500 Hz) in the intraoperative corticogram have recently been proposed as specific predictors of surgical outcome in epilepsy patients. However, online FR detection is restricted by their low signal-to-noise ratio. Here we propose the integration of low-noise EEG with unsupervised FR detection.
Methods
Pre- and post-resection ECoG (N = 9 patients) was simultaneously recorded by a commercial ...
Added: January 31, 2021
Scheer H., Fedele T., Curio G. et al., Physiological Measurement 2011 Vol. 32 No. 12 P. 73–79
Ultrafast electroencephalographic signals, having frequencies above 500 Hz, can be observed in somatosensory evoked potential measurements. Usually, these recordings have a poor signal-to-noise ratio (SNR) because weak signals are overlaid by intrinsic noise of much higher amplitude like that generated by biological sources and the amplifier. As an example, recordings at the scalp taken during ...
Added: January 31, 2021
Fedele T., van't Klooster M., Burnos S. et al., Clinical Neurophysiology 2016 Vol. 127 No. 9 P. 3066–3074
Objective: High frequency oscillations (HFOs) and in particular fast ripples (FRs) in the post-resection electrocorticogram (ECoG) have recently been shown to be highly specific predictors of outcome of epilepsy surgery. FR visual marking is time consuming and prone to observer bias. We validate here a fully automatic HFO detector against seizure outcome.
Methods: Pre-resection ECoG dataset (N=14 patients) ...
Added: January 31, 2021
Burnos S., Fedele T., schmid O. et al., NeuroImage: Clinical 2016 No. 10 P. 318–325
Objective
The somatosensory evoked potential (SEP) elicited by median nerve stimulation consists of the N20 peak together with the concurrent high frequency oscillation (HFO, > 500 Hz). We describe the conditions for HFO detection in ECoG and scalp EEG in intraoperative recordings.
Methods
During neurosurgical interventions in six patients under propofol anesthesia, the SEP was recorded from subdural electrode strips ...
Added: January 31, 2021
Lytaev S., Aleksandrov M., Ulitin A., Communications in Computer and Information Science 2017 Vol. 713 P. 229–236
Auditory and somatosensory evoked potentials (AEPs and SEPs) in 14 patients with pathological processes of the brainstem and in 24 healthy subjects were recorded. The procedure of submission of relevant and deviant signals was used for stimulation and registration of evoked potentials. Key evoked potentials changes are as follows. Low amplitude of AEP in patients ...
Added: June 26, 2018
Lytaev S., Ulitin A., Communications in Computer and Information Science 2017 Vol. 713 P. 229–236
Auditory and somatosensory evoked potentials (AEPs and SEPs) in 14 patients with pathological processes of the brainstem and in 24 healthy subjects were recorded. The procedure of submission of relevant and deviant signals was used for stimulation and registration of evoked potentials. Key evoked potentials changes are as follows. Low amplitude of AEP in patients ...
Added: June 26, 2018
Nierula B., Hohlefeld F., Curio G. et al., Neuroimage 2013 No. 76 P. 294–303
The somatotopic layout of the primary somatosensory cortex is known for its fine spatial structure as delineated in single cell recordings and macroscopic EEG evoked responses. While a gross somatotopic layout has been revealed also for neuronal oscillations responding to sensorimotor stimulation of distant body parts (e.g. hand vs. foot), it is still unclear whether ...
Added: October 23, 2014