Autor: Morenko, O. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Changes in electroencephalogram (EEG) power during subdominant (LEFT) hand finger movements in females with different alpha rhythm characteristics
Zmiany mocy elektroencefalogramu w trakcie wykonywania ruchów palcami mniej dominującej (lewej) ręki u kobiet z różnymi zmiennymi rytmu alfa
Autorzy:: Morenko, A.
Morenko, O.
Dmytrotsa, O.
Poruchynsky, A.
Korzhyk, O.
Powiązania:: https://bibliotekanauki.pl/articles/2048937.pdf
Data publikacji:: 2020
Wydawca:: Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:: brain
motor activity
attention
alpha rhythm
mózg
aktywność motoryczna
uwaga
rytm alfa
Opis:: Background. This study investigates the indicators of electroencephalographic (EEG) oscillatory activity and processes that are correlated with manual movements executed by the subdominant (left) hand in women with a high or a low individual α-frequency. Material and methods. 113 healthy right-handed women from the ages of 19 to 21 were divided randomly into two experimental groups with high (n = 59, IαF > 10.25 Hz) and low (n = 54, IαF ≤ 10.25 Hz) individual EEG α-frequency (IαF). EEG power during flexion or extension of the subdominant hand fingers was evaluated. Results. Manual movements performed by women, especially those exhibiting high modal α-frequency, were accompanied by reduced α and β power in mid and posterior cortical areas. These changes occurred in combination with a local power increase in α1-oscillations in the frontal leads. A local increase of α3-activity in the frontal cortex areas was also revealed in women with low IαF. In this same group of women, generalized increases in EEG power of θ-, β- and γ-oscillations were observed in the cortex. Conclusions. These results revealed a greater redundancy of brain processes in women with low IαF power compared to women with high α-frequency.
Wprowadzenie. Niniejsza praca poświęcona jest badaniu wskaźników elektroencefalograficznej aktywności oscylacyjnej i procesów, które są skorelowane z ruchami manualnymi, u kobiet z wysoką lub niską indywidualną częstotliwością α określoną podczas ruchów manualnych wykonywanych przez mniej dominującą (lewą) rękę. Materiał i metody. 113 zdrowych praworęcznych kobiet w wieku od 19 do 21 lat zostało podzielonych na dwie grupy eksperymentalne z wysoką (n = 59, IαF ≥ 10,254 Hz) i niską (n = 54, IαF ≤ 10,25 Hz) indywidualną wartością częstotliwości EEG α (IαF). U tych kobiet oceniona została aktywność EEG podczas zginania lub prostowania mniej dominujących palców. Wyniki. Ruchom manualnym wykonywanym przez kobiety, zwłaszcza o wysokiej modalnej częstotliwości α, towarzyszyło pewne zmniejszenie mocy fal EEG α i β w środkowych i tylnych obszarach kory mózgowej. Takie zmiany połączono z lokalnym wzrostem mocy w oscylacjach α1 w przednich przewodach. Lokalny wzrost aktywności α3 w obszarach kory czołowej został również ujawniony u kobiet z niską wartością IαF. Pewne uogólnione zwiększenie mocy fal EEG oscylacji θ, β i γ zaobserwowano w korze kobiet należących do tej grupy. Wnioski. Wyniki ujawniają większą nadmiarowość procesów mózgowych u kobiet z małą mocą fal IαF w porównaniu z kobietami z wysoką częstotliwością α.
Źródło:: Health Problems of Civilization; 2020, 14, 1; 63-69
2353-6942
2354-0265
Pojawia się w:: Health Problems of Civilization
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Spectral analysis of EEG signals among people with different levels of personal anxiety
Autorzy:: Shvaiko, S.
Dmytrotsa, O.
Poruchynska, T.
Poruchynsky, A.
Zhuravlov, O.
Morenko, A.
Powiązania:: https://bibliotekanauki.pl/articles/972745.pdf
Data publikacji:: 2018
Wydawca:: Instytut Medycyny Wsi
Tematy:: personal anxiety
encephalogram
alpha
beta
delta
theta rhythms
spectral intensity of rhythm
Opis:: Introduction. The study of electrical activity peculiarities in the cerebral cortex among people with different levels of anxiety and the dependence of EEG rhythms from the level of personal anxiety (PA) is relevant and needs to be studied. As a result of our research, we have found that during the baseline EEG among people with a moderate level of personal anxiety, the intensity of alpha rhythm predominates in the posterior areas of the cerebral cortex. People with a high level of PA had the highest rates of beta rhythm intensity. An inverse relationship between EEG main rhythms and the level of anxiety is noted. Thus, people, who were involved in our study, with the moderate level of PA had the following results: the steadier the PA, the less the intensity of the PA level. People with a high level of PA had positive connections between the alpha and beta rhythms and level of anxiety, as well as a higher activity in the right-hemisphere of the cortex, which indicates the contribution of this hemisphere in the high level PA in studies. Materials and method. The power of EEG rhythms among people (aged 18–22) with different levels of anxiety was studied. Registration of the cerebral cortex electrical activity was carried out using the «Neurocom».device. During the electroencephalogram recording, electrodes were placed on the international system 10/20. The spectral power values were analyzed in the standard physiological frequency bands: delta (1–4 Hz), theta (4–8 Hz), alpha (8–14 Hz), beta (14–35 Hz). For the spectral EEG characteristics, an absolute (ACP, μV) and relative spectral power (RSP, %) were used. The analysis of power indices was carried out in a state of rest with closed eyes (baseline),and a state of rest with open eyes during task solving as an emotional load. Results. We have found that during the EEG baseline people with the moderate level of PA had high indexes of alpha rhythm in the posterior areas of the cerebral cortex. Eyes’ opening caused an increase of the intensity of theta rhythm in the frontal area of the cerebral cortex. During the intellectual task conducting, we noticed that the increase of intensity of beta rhythm in the frontal, temporal and end-lobe parts, whereas in the central and vertex parts of the cortex the intensity of theta rhythm predominated. Among people with a high level of PA during the baseline probe, the highest rates of beta rhythm intensity in the posterior areas of the cerebral cortex were fixed. In the state of rest with open eyes, the activity of theta rhythm was revealed. The alpha rhythm had the highest rates of intensity in the posterior area of the right hemisphere. During the intellectual task, the intensity of beta rhythm predominated. In the frontal and central parts of the cortex, the intensity of theta rhythm predominated. Conclusions. During the baseline probe among people with a moderate level of PA, the intensity of alpha rhythm in the posterior areas of the cerebral cortex predominated, among people with a high level of PA – beta rhythm. eyes open caused an increase in the intensity of theta rhythm in the frontal area of the cerebral cortex of people with a moderate level of PA, and alpha rhythm in the posterior area of the right hemisphere. During the intellectual task conducted among people with a moderate level of PA, we noticed an increase in beta rhythm intensity in the frontal, temporal and end-lobe parts, but in the central and vertex parts of the cortex the intensity of theta rhythm predominated. While in another group of people who were involved in study, the intensity of beta rhythm predominated; in the frontal and central parts – theta rhythm. With a moderate level of PA, there were significant negative links between the level of anxiety and intensity of alpha, beta, theta rhythms. With a high level of PA, positive links between the intensity of alpha and beta rhythms and the level of anxiety were noticed; the intensity of EEG rhythms in this group of examined people was correlated with the right parts of the brain, which indicates to a big contribution of this part in the high level of PA among the examined people.
Źródło:: Journal of Pre-Clinical and Clinical Research; 2018, 12, 1; 22-25
1898-2395
Pojawia się w:: Journal of Pre-Clinical and Clinical Research
Dostawca treści:: Biblioteka Nauki

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