Wyniki wyszukiwania - Biblioteka Nauki

1

The analysis method of a biological signal – QEEG

100%

Żołubak M.

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2017

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tom z. 75

131--133

EN

This paper presents a comparison of differences between quantitative EEG (QEEG) and quality EEG methods of research as well as an analysis of QEEG signal. The QEEG-measuring equipment was described.

2

CORRELATION OF MORNING SALIVARY CORTISOL-MELATONIN RATIO WITH QEEG AND DELAYED RECALL IN AGING

88%

Sroykham W. , Wongsawat Y.

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2018

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tom 16(2)

177-188

EN

Melatonin and cortisol are the main hormones of the circadian rhythm, which effect cognitive decline during aging. An imbalance of circadian rhythm hormones serves as an early sign of the progress of age-related disease and brain pathology in aging. The aim of this study was to determine the cortisol-melatonin ratio in relation to brain activity and cognitive function in aging. Sixty-four aging subjects were recruited from the brain healthy project. The morning salivary of all subjects was collected for cortisol and melatonin levels analysis. The brain activity was recorded for 5 minutes in the eyes open condition and seven cognitive functions were assessed by the MoCA. The results were divided into a low ratio group and a high ratio group of cortisol-melatonin ratio. The low ratio group and the high ratio group differed in the delta-beta ratio at the left temporal lope (p < .05), and the delayed recall in the high ratio group was markedly higher than in the low ratio group. Moreover, the cortisol-melatonin ratio was strongly correlated with delayed recall (p < .05), the delta-beta ratio in the left temporal lope (p <.05), the theta alpha ratio in the left temporal lope (p < .05), and right temporal lope (p < .05). We found that a low cortisol-melatonin ratio corresponded to a high delta-beta ratio and a high thetaalpha ratio at the left temporal lobe with a low score of delayed recall function, but a high cortisol-melatonin ratio corresponded to a low delta-beta ratio and a low theta-alpha ratio at the left temporal lobe with a high score of delayed recall. The imbalance of the circadian hormone related to cognitive function and brain activity in aging could serve as a biomarker of age-related diseases.

3

An integrated model based on the QEEG index, age and cognitive function for cortisol level estimation in elderly people

88%

Sroykham W. , Wongsawat Y.

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tom 17(2)

167-177

EN

Cortisol is known to be correlated with cognition, aging, and quantitative electroencephalography (QEEG), although these factors have not yet been reported. This study aimed to evaluate an integrated model for estimating cortisol levels in elderly people. Sixty-four participants were included. Saliva cortisol levels were measured by enzyme-linked immunosorbent assay (ELISA). Cognitive function was assessed by the Montreal Cognitive Assessment (MoCA). EEG recording was performed during the eyes-opened resting state condition. QEEG in five frequency bands and ten ratios were analyzed. Stepwise multiple linear regression was used to estimate cortisol levels based on the QEEG index, age and cognitive function. The first model using the QEEG index estimated cortisol levels with an accuracy of 15.4%. The second model based on the QEEG index and age estimated cortisol levels with an accuracy of 24.3%. The third model based on the QEEG index and cognitive impairment estimated cortisol levels with an accuracy of 20.2%. The fourth model yielded the best results, estimating cortisol levels with an accuracy of 30.8%; this model was based on age, delayed recall and the QEEG index of the beta/high beta band at the central region and the delta/beta band at the left temporal region An integrated model of the QEEG index, age and delayed recall can be used to estimate cortisol levels in elderly people, which could be possibly used to predict physiological and psychiatric changes in humans.

4

Didactic Significance of Modern Simulation Programs in Vocational Education – Divagations from Own Research

88%

Prauzner T.

Journal of Education, Technology and Computer Science

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2020

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tom 11

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nr 1(31)

86-94

EN

Simulation programs in polytechnic (vocational) education have an important didactic function. On the one hand, they are a great example of modern didactic software, on the other hand, knowledge of the simulation software environment by a future graduate of a technical university increases the qualifications of the future employee and allows him to acquire an attractive profession. In the era of high requirements set by employers and competition on the education market, their knowledge seems highly justified. However, whether simulation programs, especially deterministic ones, can also act as teaching aids is not so obvious. In this article, in addition to purely theoretical considerations, will be presented stages of own research on didactic efficiency, or more precisely the impact of this group of software on the cognitive process during learning. More importantly, the didactic effectiveness was tested based on typical pedagogical research as well as by means of electroencephalographic tests using the QEEG method.

5

Quantitative Support for Convergence of Intrinsic Energies from Applied Magnetic Fields and “Noise” Fluctuations of Newton’s Gravitational Value within the Human Brain

75%

Persinger M. A. , Saroka K. S.

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tom Vol. 19, iss. 2

181--190

EN

When the energy within the mass of the human brain that is associated with the intrinsic range in fluctuations of the Gravitational Constant (G) is set equal to the energy from a magnetic field (B) within the cerebral volume and solved for B, a value in the order of 20 to 50 nT is obtained. Quantitative Electroencephalographic (QEEG) and sLORETA (Low Resolution Electromagnetic Tomography) analyses of cerebral cortical activity during exposure to a range of applied rotating, frequency-modulated, transcerebral (between the two temporal lobes) magnetic fields between < 1 nT and 7000 nT while volunteers sat within a darkened, quiet chamber were completed. There was marked enhancement of power within the 4 Hz to 10 Hz band within the right caudal (cuneus) hemisphere while the ~5 to 20 nT averaged strength magnetic fields were applied but no significant responses at lesser or greater intensities. These results suggest that a physical process coupled to the source of the fluctuation (~10-15 m3kg-1s-2) in G may interact with right hemispheric activity within the range at which gravity waves have been estimated to interact with Schumann frequencies generated between the earth and ionosphere.