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Ушаков, Вадим Леонидович

Организационные подразделения

Организационная единица

Институт интеллектуальных кибернетических систем

Цель ИИКС и стратегия развития - это подготовка кадров, способных противостоять современным угрозам и вызовам, обладающих знаниями и компетенциями в области кибернетики, информационной и финансовой безопасности для решения задач разработки базового программного обеспечения, повышения защищенности критически важных информационных систем и противодействия отмыванию денег, полученных преступным путем, и финансированию терроризма.

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Ушаков

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Вадим Леонидович

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Теперь показываю 1 - 10 из 29

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Neurophysiological Correlators of Semantic Features
(2020) Orlov, V.; Stroganova, T.; Velichkovskiy, B.; Korosteleva, A.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2020, Springer Nature Switzerland AG.The article presents the result of fMRI data processing - a map and characteristics of brain activity in the process of monitoring human speech activity. Experimental data calculated by 8 subjects. The main goal of the work was to localize the spatial and temporal dynamics of the neural networks of the cortex, which is responsible for the mechanism of verbal control. The secondary goal of the work was to recognize and remove noise components from the fMRI signal, which are related to human physiology and a feature of the test items.
Только метаданные
Dynamic Parameters of the Diffusion in Human Brain White Matter During Cognitive Tasks
(2020) Orlov, V.; Kartashov, S.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2020, Springer Nature Switzerland AG.The aim of this work was to develop and analyze the MRI sequence for the functional tractography protocol. Also, a method of combining structural MRI, fMRI, tractography and functional tractography was developed to study the effect of changes in the diffusion of human CSF during performing the simplest cognitive tasks - motor stimulation and visual perception. Curves of these dynamic changes were obtained. A number of additional studies conducted show that described effect does not depend on the nearby large vessels.
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Information Approach in the Problems of Data Processing and Analysis of Cognitive Experiments
(2019) Korosteleva, A.; Mishulina, O.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2019, Springer Nature Switzerland AG. In this paper, information indicators for solving statistical problems at various stages of analyzing psychological test data are analyzed: in the process of detecting and removing from the sample incorrectly formulated test tasks, for grouping participants according to similarity indicators of their answers in test tasks and highlighting participants with unique characteristics. The proposed methodology is illustrated by the data of a psychological test aimed at identifying a person’s ability to spatial imagination, the formation of associative links between objects and the solution of logical problems.
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The Concept of Functional Tractography Method for Cognitive Brain Studies
(2019) Ponomarenko, N.; Kartashov, S.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2019, Springer Nature Switzerland AG. The aim of this work is to develop method of functional tractography based on the fast MRI sequence (Multi-Band EPI). It is planned to identify active areas of white matter (active tracts) responsible for the realization of motor function and visual perception. The functional MRI method, universally recognized and quite popular in cognitive brain studies, clearly reveals sources of activity in the gray matter of the brain. Proposed method of functional tractography supposed to make it possible to determine the activity in the deep structures of white matter tracts, which gives a number of advantages in understanding the network interaction of human brain regions among themselves both in healthy people and in patients.
Только метаданные
Lateralization in Neurosemantics: Are Some Lexical Clusters More Equal Than Others?
(2021) Nosovets, Z.; Velichkovsky, B. M.; Zaidelman, L.; Orlov, V.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.In this study, we have implemented neurosemantic analysis to identify brain’s voxel-wise representations of words in Russian spoken narratives and their asymmetries in the brain. 25 subjects listen to five stories, first person narratives of dramatic events, while their brain activation was registered by 3T functional magnetic resonance imaging (fMRI). Seven best subjects in terms of their engagement and objective control of brain reaction were selected for further analysis. Twelve lexical clusters were found, with different semantics – from time-and-space concepts to human actions and mental states. Clusters “experience” and “threat” were ones that on average demonstrated a symmetrical localization. For other clusters, brain localization has a left-sided bias. Our results support the view of non-modular and widely distributed nature of semantic representations, not limited to the activity of structures in the temporal and frontal lobes. These results also demonstrate that the right hemisphere can be involved in representation of mental lexicon. Our findings were broadly consistent with those reported for the English language, which points to the universality of the factors governing brain’s lexical representations.
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Comparative Analysis of Methods for Calculating the Interactions Between the Human Brain Regions Based on Resting-State FMRI Data to Build Long-Term Cognitive Architectures
(2021) Poyda, A.; Sharaev, M.; Orlov, V.; Kozlov, S.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.In this work, we compared many different methods proposed for calculating the functional interaction of brain regions based on resting-state fMRI data. We compared them according to the criterion of the stability of the results to small changes in the parameters of both the methods themselves and the input data including different levels of noise. By stability, here we mean that small changes in the parameters and level of noise will lead to small changes in the obtained estimates of the interaction. Since fMRI has a temporal resolution of about 2 s, here we focused on long-term architectures (400 s or more). Our study revealed that measures of Correlation and Coherence families show slightly better values for sustainability. This is in a good agreement with the result obtained earlier on synthetic fMRI data when evaluating medium-strength connections, that may be characteristic of resting-state.
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Russian-language neurosemantics: Clustering of word meaning and sense from oral narratives
(2021) Zaidelman, L.; Nosovets, Z.; Kotov, A.; Zabotkina, V.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2021 Elsevier B.V.This article is a part of a large-scale brain mapping project aimed at finding the relations among semantic categories in oral Russian-language texts and brain activity as measured using functional magnetic resonance imaging (fMRI). The goal of present study in particular is to examine the nature of lexical semantic relations and find an appropriate lexical space, homeomorphic to the activation patterns in the brain. Participants were presented with oral narratives, which described significant social issues from the first-person perspective. Stimuli were annotated using a dictionary and a vector approach. Results show that fMRI signal and clusters of related words have similar patterns of brain activation across participants. Results also show that annotation by a list of features more strongly contributes to prediction of the observed activation patterns. Findings confirm the hypothesis of situational semantic representation in the brain.
Только метаданные
Influence of Dominance on Human Brain Activity During Voluntary Movement in Parkinson’s Disease
(2021) Filyushkina, V.; Popov, V.; Batalov, A.; Tomskiy, A.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.Hand dominance is known to make a robust bias on human brain activity in a normal state. Recent studies showed that simple motor tasks performed by a non-dominant hand caused increased activation, similar to that which occurs when more complex tests are performed with a dominant hand. The influence of dominance on brain activity in Parkinon’s disease (PD) remains unclear. In the present study we made an attempt to analyse the differences between brain activity during dominant and non-dominant hand movements in PD and compare it with the control group. We used functional MRI and an event-related paradigm to study the brain activity of 16 subjects in control group and 16 patients with PD during left and right hand movements. Data analysis showed few clearly lateralized clusters of activity in major motor areas in the control group and two hemispheric activation in motor and non-motor areas in PD group during both hand movements. We also found a deficit in the activation of the primary somatosensory cortex, primary motor cortex, basal ganglia, and insula during both movements in the PD group compared to controls. At the same time we found brain activity asymmetry caused by the dominance influence in the PD group. Thus, we have shown that although motor deficit in Parkinson's disease has a greater effect on habitual movement, the influence of dominance still persists and should be taken into account in PD studies.
Только метаданные
Voxel-Wise Localization of Brain Activity While Comprehending Oral Russian-Language Stories
(2021) Nosovets, Z.; Velichkovsky, B. M.; Zaidelman, L.; Orlov, V.; Ushakov, V.; Ушаков, Вадим Леонидович
© 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.We have implemented neurosemantic analysis to identify voxel-wise representations of lexical items in brain’s reaction of native participants on Russian spoken narratives and these representations possible global asymmetries in the brain. Twenty-five subjects took part in this study. Five texts with personal life stories were presented as audio stimuli. Each story was 2 min long. Ultrafast MRI sequences (TR = 1000 ms) were used to scan brain activity. Scanning was performed on 3 T MRI (Siemens). Seven subjects were selected for further analysis following the control of their cognitive involvement into listening and the level of their registered brain activity. As in an earlier our study with these narratives, twelve lexical clusters were found, with different but coherent semantic fields: from time-and-space concepts to human actions and mental states. The individual semantic maps of each subject look similar in terms of their broad brain activity distribution. Clusters demonstrated nearly symmetrical localization. This fact implies that the left and right hemispheres are both involved in the neural representation of mental lexicon.
Только метаданные
On the Possibility of Ontology Map Constructing on the Cerebral Cortex
(2022) Zhulego, V.; Ushakov, V.; Balyakin, A.; Chernavskaya, O.; Ушаков, Вадим Леонидович
A hypothesis has been put forward about the possibility of setting up an experiment to test the correlation between the factorial mathematical model of the subject area, and the thinking model of the subject area on the cerebral cortex. By analogy with the semantic map of the cerebral cortex, it is proposed to build an ontological map of the cerebral cortex, i.e. to localize denotations of the phenomena. A number of arguments are given in favor of such a hypothesis and the possibilities of setting up an experiment are discussed.